forked from OSchip/llvm-project
1352 lines
34 KiB
LLVM
1352 lines
34 KiB
LLVM
; RUN: opt -S -licm < %s | FileCheck %s -check-prefixes=CHECK,CHECK-DISABLED
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; RUN: opt -S -licm -licm-control-flow-hoisting=1 < %s | FileCheck %s -check-prefixes=CHECK,CHECK-ENABLED
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; RUN: opt -S -licm -licm-control-flow-hoisting=0 < %s | FileCheck %s -check-prefixes=CHECK,CHECK-DISABLED
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; RUN: opt -passes='require<opt-remark-emit>,loop(licm)' -S < %s | FileCheck %s -check-prefixes=CHECK,CHECK-DISABLED
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; RUN: opt -passes='require<opt-remark-emit>,loop(licm)' -licm-control-flow-hoisting=1 -S < %s | FileCheck %s -check-prefixes=CHECK,CHECK-ENABLED
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; RUN: opt -passes='require<opt-remark-emit>,loop(licm)' -licm-control-flow-hoisting=0 -S < %s | FileCheck %s -check-prefixes=CHECK,CHECK-DISABLED
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; CHECK-LABEL: @triangle_phi
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define void @triangle_phi(i32 %x, i32* %p) {
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; CHECK-LABEL: entry:
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; CHECK: %cmp1 = icmp sgt i32 %x, 0
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; CHECK-ENABLED: br i1 %cmp1, label %[[IF_LICM:.*]], label %[[THEN_LICM:.*]]
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entry:
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br label %loop
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; CHECK-ENABLED: [[IF_LICM]]:
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; CHECK: %add = add i32 %x, 1
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; CHECK-ENABLED: br label %[[THEN_LICM]]
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; CHECK-ENABLED: [[THEN_LICM]]:
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; CHECK-ENABLED: phi i32 [ %add, %[[IF_LICM]] ], [ %x, %entry ]
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; CHECK-ENABLED: store i32 %phi, i32* %p
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; CHECK-ENABLED: %cmp2 = icmp ne i32 %phi, 0
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; CHECK: br label %loop
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loop:
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%cmp1 = icmp sgt i32 %x, 0
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br i1 %cmp1, label %if, label %then
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if:
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%add = add i32 %x, 1
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br label %then
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; CHECK-LABEL: then:
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; CHECK-DISABLED: %phi = phi i32 [ %add, %if ], [ %x, %loop ]
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; CHECK-DISABLED: %cmp2 = icmp ne i32 %phi, 0
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then:
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%phi = phi i32 [ %add, %if ], [ %x, %loop ]
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store i32 %phi, i32* %p
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%cmp2 = icmp ne i32 %phi, 0
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br i1 %cmp2, label %loop, label %end
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; CHECK-LABEL: end:
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; CHECK-DISABLED: %[[PHI_LCSSA:.*]] = phi i32 [ %phi, %then ]
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; CHECK-DISABLED: store i32 %[[PHI_LCSSA]], i32* %p
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end:
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ret void
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}
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; CHECK-LABEL: @diamond_phi
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define void @diamond_phi(i32 %x, i32* %p) {
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; CHECK-LABEL: entry:
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; CHECK: %cmp1 = icmp sgt i32 %x, 0
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; CHECK-ENABLED: br i1 %cmp1, label %[[IF_LICM:.*]], label %[[ELSE_LICM:.*]]
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entry:
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br label %loop
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; CHECK-ENABLED: [[IF_LICM]]:
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; CHECK-DAG: %add = add i32 %x, 1
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; CHECK-ENABLED: br label %[[THEN_LICM:.*]]
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; CHECK-ENABLED: [[ELSE_LICM]]:
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; CHECK-DAG: %sub = sub i32 %x, 1
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; CHECK-ENABLED: br label %[[THEN_LICM]]
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; CHECK-ENABLED: [[THEN_LICM]]
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; CHECK-ENABLED: %phi = phi i32 [ %add, %[[IF_LICM]] ], [ %sub, %[[ELSE_LICM]] ]
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; CHECK-ENABLED: store i32 %phi, i32* %p
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; CHECK-ENABLED: %cmp2 = icmp ne i32 %phi, 0
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; CHECK: br label %loop
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loop:
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%cmp1 = icmp sgt i32 %x, 0
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br i1 %cmp1, label %if, label %else
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if:
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%add = add i32 %x, 1
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br label %then
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else:
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%sub = sub i32 %x, 1
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br label %then
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; CHECK-LABEL: then:
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; CHECK-DISABLED: %phi = phi i32 [ %add, %if ], [ %sub, %else ]
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; CHECK-DISABLED: %cmp2 = icmp ne i32 %phi, 0
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then:
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%phi = phi i32 [ %add, %if ], [ %sub, %else ]
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store i32 %phi, i32* %p
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%cmp2 = icmp ne i32 %phi, 0
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br i1 %cmp2, label %loop, label %end
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; CHECK-LABEL: end:
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; CHECK-DISABLED: %[[PHI_LCSSA:.*]] = phi i32 [ %phi, %then ]
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; CHECK-DISABLED: store i32 %[[PHI_LCSSA]], i32* %p
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end:
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ret void
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}
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; TODO: This is currently too complicated for us to be able to hoist the phi.
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; CHECK-LABEL: @three_way_phi
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define void @three_way_phi(i32 %x, i32* %p) {
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; CHECK-LABEL: entry:
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; CHECK-DAG: %cmp1 = icmp sgt i32 %x, 0
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; CHECK-DAG: %add = add i32 %x, 1
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; CHECK-DAG: %cmp2 = icmp sgt i32 %add, 0
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; CHECK-ENABLED: br i1 %cmp1, label %[[IF_LICM:.*]], label %[[ELSE_LICM:.*]]
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; CHECK-ENABLED: [[IF_LICM]]:
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; CHECK-ENABLED: br label %[[THEN_LICM:.*]]
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; CHECK-ENABLED: [[THEN_LICM]]:
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; CHECK: %sub = sub i32 %x, 1
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; CHECK: br label %loop
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entry:
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br label %loop
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loop:
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%cmp1 = icmp sgt i32 %x, 0
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br i1 %cmp1, label %if, label %then
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if:
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%add = add i32 %x, 1
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%cmp2 = icmp sgt i32 %add, 0
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br i1 %cmp2, label %if.if, label %then
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if.if:
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%sub = sub i32 %x, 1
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br label %then
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then:
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%phi = phi i32 [ 0, %loop ], [ %add, %if ], [ %sub, %if.if ]
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store i32 %phi, i32* %p
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%cmp3 = icmp ne i32 %phi, 0
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br i1 %cmp3, label %loop, label %end
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end:
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ret void
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}
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; TODO: This is currently too complicated for us to be able to hoist the phi.
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; CHECK-LABEL: @tree_phi
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define void @tree_phi(i32 %x, i32* %p) {
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; CHECK-LABEL: entry:
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; CHECK-DAG: %cmp1 = icmp sgt i32 %x, 0
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; CHECK-DAG: %add = add i32 %x, 1
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; CHECK-DAG: %cmp2 = icmp sgt i32 %add, 0
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; CHECK-DAG: %sub = sub i32 %x, 1
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; CHECK: br label %loop
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entry:
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br label %loop
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loop:
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%cmp1 = icmp sgt i32 %x, 0
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br i1 %cmp1, label %if, label %else
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if:
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%add = add i32 %x, 1
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%cmp2 = icmp sgt i32 %add, 0
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br i1 %cmp2, label %if.if, label %if.else
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if.if:
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br label %then
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if.else:
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br label %then
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else:
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%sub = sub i32 %x, 1
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br label %then
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then:
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%phi = phi i32 [ %add, %if.if ], [ 0, %if.else ], [ %sub, %else ]
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store i32 %phi, i32* %p
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%cmp3 = icmp ne i32 %phi, 0
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br i1 %cmp3, label %loop, label %end
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end:
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ret void
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}
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; TODO: We can hoist the first phi, but not the second.
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; CHECK-LABEL: @phi_phi
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define void @phi_phi(i32 %x, i32* %p) {
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; CHECK-LABEL: entry:
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; CHECK-DAG: %cmp1 = icmp sgt i32 %x, 0
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; CHECK-DAG: %add = add i32 %x, 1
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; CHECK-DAG: %cmp2 = icmp sgt i32 %add, 0
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; CHECK-DAG: %sub = sub i32 %x, 1
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; CHECK-ENABLED: br i1 %cmp2, label %[[IF_IF_LICM:.*]], label %[[IF_ELSE_LICM:.*]]
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; CHECK-ENABLED: [[IF_IF_LICM]]:
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; CHECK-ENABLED: br label %[[IF_THEN_LICM:.*]]
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; CHECK-ENABLED: [[IF_ELSE_LICM]]:
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; CHECK-ENABLED: br label %[[IF_THEN_LICM]]
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; CHECK-ENABLED: [[IF_THEN_LICM]]:
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; CHECK-ENABLED: %phi1 = phi i32 [ %add, %[[IF_IF_LICM]] ], [ 0, %[[IF_ELSE_LICM]] ]
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; CHECK: br label %loop
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entry:
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br label %loop
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loop:
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%cmp1 = icmp sgt i32 %x, 0
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br i1 %cmp1, label %if, label %else
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if:
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%add = add i32 %x, 1
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%cmp2 = icmp sgt i32 %add, 0
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br i1 %cmp2, label %if.if, label %if.else
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if.if:
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br label %if.then
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if.else:
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br label %if.then
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; CHECK-LABEL: if.then:
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; CHECK-DISABLED: %phi1 = phi i32 [ %add, %if.if ], [ 0, %if.else ]
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if.then:
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%phi1 = phi i32 [ %add, %if.if ], [ 0, %if.else ]
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br label %then
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else:
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%sub = sub i32 %x, 1
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br label %then
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; CHECK-LABEL: then:
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; CHECK: %phi2 = phi i32 [ %phi1, %if.then ], [ %sub, %else ]
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then:
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%phi2 = phi i32 [ %phi1, %if.then ], [ %sub, %else ]
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store i32 %phi2, i32* %p
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%cmp3 = icmp ne i32 %phi2, 0
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br i1 %cmp3, label %loop, label %end
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end:
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ret void
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}
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; Check that we correctly duplicate empty control flow.
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; CHECK-LABEL: @empty_triangle_phi
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define i8 @empty_triangle_phi(i32 %x, i32 %y) {
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; CHECK-LABEL: entry:
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; CHECK: %cmp1 = icmp eq i32 %x, 0
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; CHECK-ENABLED: br i1 %cmp1, label %[[IF_LICM:.*]], label %[[THEN_LICM:.*]]
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entry:
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br label %loop
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; CHECK-ENABLED: [[IF_LICM]]:
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; CHECK-ENABLED: br label %[[THEN_LICM]]
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; CHECK-ENABLED: [[THEN_LICM]]:
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; CHECK-ENABLED: %phi = phi i8 [ 0, %[[IF_LICM]] ], [ 1, %entry ]
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; CHECK: %cmp2 = icmp eq i32 %y, 0
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; CHECK: br label %loop
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loop:
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%cmp1 = icmp eq i32 %x, 0
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br i1 %cmp1, label %if, label %then
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if:
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br label %then
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; CHECK-LABEL: then:
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; CHECK-DISABLED: %phi = phi i8 [ 0, %if ], [ 1, %loop ]
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then:
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%phi = phi i8 [ 0, %if ], [ 1, %loop ]
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%cmp2 = icmp eq i32 %y, 0
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br i1 %cmp2, label %end, label %loop
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end:
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ret i8 %phi
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}
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; CHECK-LABEL: @empty_diamond_phi
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define i8 @empty_diamond_phi(i32 %x, i32 %y) {
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; CHECK-LABEL: entry:
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; CHECK: %cmp1 = icmp eq i32 %x, 0
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; CHECK-ENABLED: br i1 %cmp1, label %[[IF_LICM:.*]], label %[[ELSE_LICM:.*]]
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entry:
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br label %loop
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; CHECK-ENABLED: [[IF_LICM]]:
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; CHECK-ENABLED: br label %[[THEN_LICM:.*]]
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; CHECK-ENABLED: [[ELSE_LICM]]:
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; CHECK-ENABLED: br label %[[THEN_LICM]]
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; CHECK-ENABLED: [[THEN_LICM]]:
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; CHECK-ENABLED: %phi = phi i8 [ 0, %[[IF_LICM]] ], [ 1, %[[ELSE_LICM]] ]
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; CHECK: %cmp2 = icmp eq i32 %y, 0
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; CHECK: br label %loop
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loop:
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%cmp1 = icmp eq i32 %x, 0
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br i1 %cmp1, label %if, label %else
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if:
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br label %then
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else:
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br label %then
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; CHECK-LABEL: then:
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; CHECK-DISABLED: %phi = phi i8 [ 0, %if ], [ 1, %else ]
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then:
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%phi = phi i8 [ 0, %if ], [ 1, %else ]
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%cmp2 = icmp eq i32 %y, 0
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br i1 %cmp2, label %end, label %loop
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end:
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ret i8 %phi
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}
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; Check that we correctly handle the case that the first thing we try to hoist is a phi.
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; CHECK-LABEL: @empty_triangle_phi_first
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define i8 @empty_triangle_phi_first(i32 %x, i1 %cond) {
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; CHECK-LABEL: entry:
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; CHECK-ENABLED: br i1 %cond, label %[[IF_LICM:.*]], label %[[THEN_LICM:.*]]
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entry:
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br label %loop
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; CHECK-ENABLED: [[IF_LICM]]:
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; CHECK-ENABLED: br label %[[THEN_LICM]]
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; CHECK-ENABLED: [[THEN_LICM]]:
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; CHECK-ENABLED: %phi = phi i8 [ 0, %[[IF_LICM]] ], [ 1, %entry ]
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; CHECK: %cmp = icmp eq i32 %x, 0
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; CHECK: br label %loop
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loop:
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br i1 %cond, label %if, label %then
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if:
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br label %then
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; CHECK-LABEL: then:
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; CHECK-DISABLED: %phi = phi i8 [ 0, %if ], [ 1, %loop ]
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then:
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%phi = phi i8 [ 0, %if ], [ 1, %loop ]
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%cmp = icmp eq i32 %x, 0
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br i1 %cmp, label %end, label %loop
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end:
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ret i8 %phi
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}
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; CHECK-LABEL: @empty_diamond_phi
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define i8 @empty_diamond_phi_first(i32 %x, i1 %cond) {
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; CHECK-LABEL: entry:
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; CHECK-ENABLED: br i1 %cond, label %[[IF_LICM:.*]], label %[[ELSE_LICM:.*]]
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entry:
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br label %loop
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; CHECK-ENABLED: [[IF_LICM]]:
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; CHECK-ENABLED: br label %[[THEN_LICM:.*]]
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; CHECK-ENABLED: [[ELSE_LICM]]:
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; CHECK-ENABLED: br label %[[THEN_LICM]]
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; CHECK-ENABLED: [[THEN_LICM]]:
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; CHECK-ENABLED: %phi = phi i8 [ 0, %[[IF_LICM]] ], [ 1, %[[ELSE_LICM]] ]
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; CHECK: %cmp = icmp eq i32 %x, 0
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; CHECK: br label %loop
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loop:
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br i1 %cond, label %if, label %else
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if:
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br label %then
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else:
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br label %then
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; CHECK-LABEL: then:
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; CHECK-DISABLED: %phi = phi i8 [ 0, %if ], [ 1, %else ]
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then:
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%phi = phi i8 [ 0, %if ], [ 1, %else ]
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%cmp = icmp eq i32 %x, 0
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br i1 %cmp, label %end, label %loop
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end:
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ret i8 %phi
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}
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; CHECK-LABEL: @empty_triangle_phi_first
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define i8 @empty_triangle_phi_first_empty_loop_head(i32 %x, i1 %cond) {
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; CHECK-LABEL: entry:
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; CHECK-ENABLED: br i1 %cond, label %[[IF_LICM:.*]], label %[[THEN_LICM:.*]]
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entry:
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br label %loop
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; CHECK-ENABLED: [[IF_LICM]]:
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; CHECK-ENABLED: br label %[[THEN_LICM]]
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; CHECK-ENABLED: [[THEN_LICM]]:
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; CHECK-ENABLED: %phi = phi i8 [ 0, %[[IF_LICM]] ], [ 1, %entry ]
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; CHECK: %cmp = icmp eq i32 %x, 0
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; CHECK: br label %loop
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loop:
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br label %test
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test:
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br i1 %cond, label %if, label %then
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if:
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br label %then
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; CHECK-LABEL: then:
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; CHECK-DISABLED: %phi = phi i8 [ 0, %if ], [ 1, %test ]
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then:
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%phi = phi i8 [ 0, %if ], [ 1, %test ]
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%cmp = icmp eq i32 %x, 0
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br i1 %cmp, label %end, label %loop
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end:
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ret i8 %phi
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}
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; CHECK-LABEL: @empty_diamond_phi_first_empty_loop_head
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define i8 @empty_diamond_phi_first_empty_loop_head(i32 %x, i1 %cond) {
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; CHECK-LABEL: entry:
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; CHECK-ENABLED: br i1 %cond, label %[[IF_LICM:.*]], label %[[ELSE_LICM:.*]]
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entry:
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br label %loop
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; CHECK-ENABLED: [[IF_LICM]]:
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; CHECK-ENABLED: br label %[[THEN_LICM:.*]]
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; CHECK-ENABLED: [[ELSE_LICM]]:
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; CHECK-ENABLED: br label %[[THEN_LICM]]
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; CHECK-ENABLED: [[THEN_LICM]]:
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; CHECK-ENABLED: %phi = phi i8 [ 0, %[[IF_LICM]] ], [ 1, %[[ELSE_LICM]] ]
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; CHECK: %cmp = icmp eq i32 %x, 0
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; CHECK: br label %loop
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loop:
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br label %test
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test:
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br i1 %cond, label %if, label %else
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if:
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br label %then
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else:
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br label %then
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|
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; CHECK-LABEL: then:
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; CHECK-DISABLED: %phi = phi i8 [ 0, %if ], [ 1, %else ]
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|
then:
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%phi = phi i8 [ 0, %if ], [ 1, %else ]
|
|
%cmp = icmp eq i32 %x, 0
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|
br i1 %cmp, label %end, label %loop
|
|
|
|
end:
|
|
ret i8 %phi
|
|
}
|
|
|
|
; The phi is on one branch of a diamond while simultaneously at the end of a
|
|
; triangle. Check that we duplicate the triangle and not the diamond.
|
|
; CHECK-LABEL: @triangle_diamond
|
|
define void @triangle_diamond(i32* %ptr, i32 %x, i32 %y) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK-DAG: %cmp1 = icmp ne i32 %x, 0
|
|
; CHECK-DAG: %cmp2 = icmp ne i32 %y, 0
|
|
; CHECK-ENABLED: br i1 %cmp1, label %[[IF_LICM:.*]], label %[[THEN_LICM:.*]]
|
|
entry:
|
|
br label %loop
|
|
|
|
; CHECK-ENABLED: [[IF_LICM]]:
|
|
; CHECK-ENABLED: br label %[[THEN_LICM]]
|
|
|
|
; CHECK-ENABLED: [[THEN_LICM]]:
|
|
; CHECK-ENABLED: %phi = phi i32 [ 0, %[[IF_LICM]] ], [ 127, %entry ]
|
|
; CHECK: br label %loop
|
|
|
|
loop:
|
|
%cmp1 = icmp ne i32 %x, 0
|
|
br i1 %cmp1, label %if, label %then
|
|
|
|
if:
|
|
%cmp2 = icmp ne i32 %y, 0
|
|
br i1 %cmp2, label %if.then, label %then
|
|
|
|
; CHECK-LABEL: then:
|
|
; CHECK-DISABLED: %phi = phi i32 [ 0, %if ], [ 127, %loop ]
|
|
then:
|
|
%phi = phi i32 [ 0, %if ], [ 127, %loop ]
|
|
store i32 %phi, i32* %ptr
|
|
br label %end
|
|
|
|
if.then:
|
|
br label %end
|
|
|
|
end:
|
|
br label %loop
|
|
}
|
|
|
|
; As the previous, but the end of the diamond is the head of the loop.
|
|
; CHECK-LABEL: @triangle_diamond_backedge
|
|
define void @triangle_diamond_backedge(i32* %ptr, i32 %x, i32 %y) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK-DAG: %cmp1 = icmp ne i32 %x, 0
|
|
; CHECK-DAG: %cmp2 = icmp ne i32 %y, 0
|
|
; CHECK-ENABLED: br i1 %cmp1, label %[[IF_LICM:.*]], label %[[THEN_LICM:.*]]
|
|
entry:
|
|
br label %loop
|
|
|
|
; CHECK-ENABLED: [[IF_LICM]]:
|
|
; CHECK-ENABLED: br label %[[THEN_LICM]]
|
|
|
|
; CHECK-ENABLED: [[THEN_LICM]]:
|
|
; CHECK-ENABLED: %phi = phi i32 [ 0, %[[IF_LICM]] ], [ 127, %entry ]
|
|
; CHECK: br label %loop
|
|
|
|
loop:
|
|
%cmp1 = icmp ne i32 %x, 0
|
|
br i1 %cmp1, label %if, label %then
|
|
|
|
if:
|
|
%cmp2 = icmp ne i32 %y, 0
|
|
br i1 %cmp2, label %backedge, label %then
|
|
|
|
; CHECK-LABEL: then:
|
|
; CHECK-DISABLED: %phi = phi i32 [ 0, %if ], [ 127, %loop ]
|
|
then:
|
|
%phi = phi i32 [ 0, %if ], [ 127, %loop ]
|
|
store i32 %phi, i32* %ptr
|
|
br label %loop
|
|
|
|
backedge:
|
|
br label %loop
|
|
}
|
|
|
|
; TODO: The inner diamonds can be hoisted, but not currently the outer diamond
|
|
; CHECK-LABEL: @diamonds_inside_diamond
|
|
define void @diamonds_inside_diamond(i32 %x, i32* %p) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK-DAG: %cmp1 = icmp sgt i32 %x, 0
|
|
; CHECK-DAG: %cmp3 = icmp slt i32 %x, -10
|
|
; CHECK-ENABLED: br i1 %cmp3, label %[[ELSE_IF_LICM:.*]], label %[[ELSE_ELSE_LICM:.*]]
|
|
entry:
|
|
br label %loop
|
|
|
|
; CHECK-ENABLED: [[ELSE_IF_LICM]]:
|
|
; CHECK-ENABLED: br label %[[ELSE_THEN_LICM:.*]]
|
|
|
|
; CHECK-ENABLED: [[ELSE_ELSE_LICM]]:
|
|
; CHECK-ENABLED: br label %[[ELSE_THEN_LICM]]
|
|
|
|
; CHECK-ENABLED: [[ELSE_THEN_LICM]]:
|
|
; CHECK-ENABLED: %phi2 = phi i32 [ 2, %[[ELSE_IF_LICM]] ], [ 3, %[[ELSE_ELSE_LICM]] ]
|
|
; CHECK: %cmp2 = icmp sgt i32 %x, 10
|
|
; CHECK-ENABLED: br i1 %cmp2, label %[[IF_IF_LICM:.*]], label %[[IF_ELSE_LICM:.*]]
|
|
|
|
; CHECK-ENABLED: [[IF_IF_LICM]]:
|
|
; CHECK-ENABLED: br label %[[IF_THEN_LICM:.*]]
|
|
|
|
; CHECK-ENABLED: [[IF_ELSE_LICM]]:
|
|
; CHECK-ENABLED: br label %[[IF_THEN_LICM]]
|
|
|
|
; CHECK-ENABLED: [[IF_THEN_LICM]]:
|
|
; CHECK-ENABLED: %phi1 = phi i32 [ 0, %[[IF_IF_LICM]] ], [ 1, %[[IF_ELSE_LICM]] ]
|
|
; CHECK: br label %loop
|
|
|
|
loop:
|
|
%cmp1 = icmp sgt i32 %x, 0
|
|
br i1 %cmp1, label %if, label %else
|
|
|
|
if:
|
|
%cmp2 = icmp sgt i32 %x, 10
|
|
br i1 %cmp2, label %if.if, label %if.else
|
|
|
|
if.if:
|
|
br label %if.then
|
|
|
|
if.else:
|
|
br label %if.then
|
|
|
|
; CHECK-LABEL: if.then:
|
|
; CHECK-DISABLED: %phi1 = phi i32 [ 0, %if.if ], [ 1, %if.else ]
|
|
if.then:
|
|
%phi1 = phi i32 [ 0, %if.if ], [ 1, %if.else ]
|
|
br label %then
|
|
|
|
else:
|
|
%cmp3 = icmp slt i32 %x, -10
|
|
br i1 %cmp3, label %else.if, label %else.else
|
|
|
|
else.if:
|
|
br label %else.then
|
|
|
|
else.else:
|
|
br label %else.then
|
|
|
|
; CHECK-LABEL: else.then:
|
|
; CHECK-DISABLED: %phi2 = phi i32 [ 2, %else.if ], [ 3, %else.else ]
|
|
else.then:
|
|
%phi2 = phi i32 [ 2, %else.if ], [ 3, %else.else ]
|
|
br label %then
|
|
|
|
; CHECK-LABEL: then:
|
|
; CHECK: %phi3 = phi i32 [ %phi1, %if.then ], [ %phi2, %else.then ]
|
|
; CHECK: %cmp4 = icmp ne i32 %phi3, 0
|
|
then:
|
|
%phi3 = phi i32 [ %phi1, %if.then ], [ %phi2, %else.then ]
|
|
store i32 %phi3, i32* %p
|
|
%cmp4 = icmp ne i32 %phi3, 0
|
|
br i1 %cmp4, label %loop, label %end
|
|
|
|
end:
|
|
ret void
|
|
}
|
|
|
|
; We can hoist blocks that contain an edge that exits the loop by ignoring that
|
|
; edge in the hoisted block.
|
|
; CHECK-LABEL: @triangle_phi_loopexit
|
|
define void @triangle_phi_loopexit(i32 %x, i32* %p) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK-DAG: %add = add i32 %x, 1
|
|
; CHECK-DAG: %cmp1 = icmp sgt i32 %x, 0
|
|
; CHECK-DAG: %cmp2 = icmp sgt i32 10, %add
|
|
; CHECK-ENABLED: br i1 %cmp1, label %[[IF_LICM:.*]], label %[[THEN_LICM:.*]]
|
|
entry:
|
|
br label %loop
|
|
|
|
; CHECK-ENABLED: [[IF_LICM]]:
|
|
; CHECK-ENABLED: br label %[[THEN_LICM]]
|
|
|
|
; CHECK-ENABLED: [[THEN_LICM]]:
|
|
; CHECK-ENABLED: %phi = phi i32 [ %add, %[[IF_LICM]] ], [ %x, %entry ]
|
|
; CHECK: br label %loop
|
|
|
|
loop:
|
|
%cmp1 = icmp sgt i32 %x, 0
|
|
br i1 %cmp1, label %if, label %then
|
|
|
|
if:
|
|
%add = add i32 %x, 1
|
|
%cmp2 = icmp sgt i32 10, %add
|
|
br i1 %cmp2, label %then, label %end
|
|
|
|
; CHECK-LABEL: then:
|
|
; CHECK-DISABLED: %phi = phi i32 [ %add, %if ], [ %x, %loop ]
|
|
then:
|
|
%phi = phi i32 [ %add, %if ], [ %x, %loop ]
|
|
store i32 %phi, i32* %p
|
|
%cmp3 = icmp ne i32 %phi, 0
|
|
br i1 %cmp3, label %loop, label %end
|
|
|
|
end:
|
|
ret void
|
|
}
|
|
|
|
; CHECK-LABEL: @diamond_phi_oneloopexit
|
|
define void @diamond_phi_oneloopexit(i32 %x, i32* %p) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK-DAG: %add = add i32 %x, 1
|
|
; CHECK-DAG: %cmp1 = icmp sgt i32 %x, 0
|
|
; CHECK-DAG: %cmp2 = icmp sgt i32 10, %add
|
|
; CHECK-ENABLED: br i1 %cmp1, label %[[IF_LICM:.*]], label %[[THEN_LICM:.*]]
|
|
entry:
|
|
br label %loop
|
|
|
|
; CHECK-ENABLED: [[IF_LICM]]:
|
|
; CHECK-ENABLED: br label %[[THEN_LICM:.*]]
|
|
|
|
; CHECK-ENABLED: [[ELSE_LICM]]:
|
|
; CHECK-DAG: %sub = sub i32 %x, 1
|
|
; CHECK-ENABLED: br label %[[THEN_LICM]]
|
|
|
|
; CHECK-ENABLED: [[THEN_LICM]]
|
|
; CHECK-ENABLED: %phi = phi i32 [ %add, %[[IF_LICM]] ], [ %sub, %[[ELSE_LICM]] ]
|
|
; CHECK-ENABLED: %cmp3 = icmp ne i32 %phi, 0
|
|
; CHECK: br label %loop
|
|
|
|
loop:
|
|
%cmp1 = icmp sgt i32 %x, 0
|
|
br i1 %cmp1, label %if, label %else
|
|
|
|
if:
|
|
%add = add i32 %x, 1
|
|
%cmp2 = icmp sgt i32 10, %add
|
|
br i1 %cmp2, label %then, label %end
|
|
|
|
else:
|
|
%sub = sub i32 %x, 1
|
|
br label %then
|
|
|
|
; CHECK-LABEL: then:
|
|
; CHECK-DISABLED: %phi = phi i32 [ %add, %if ], [ %sub, %else ]
|
|
then:
|
|
%phi = phi i32 [ %add, %if ], [ %sub, %else ]
|
|
store i32 %phi, i32* %p
|
|
%cmp3 = icmp ne i32 %phi, 0
|
|
br i1 %cmp3, label %loop, label %end
|
|
|
|
end:
|
|
ret void
|
|
}
|
|
|
|
; CHECK-LABEL: @diamond_phi_twoloopexit
|
|
define void @diamond_phi_twoloopexit(i32 %x, i32* %p) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK-DAG: %sub = sub i32 %x, 1
|
|
; CHECK-DAG: %add = add i32 %x, 1
|
|
; CHECK-DAG: %cmp1 = icmp sgt i32 %x, 0
|
|
; CHECK-DAG: %cmp2 = icmp sgt i32 10, %add
|
|
; CHECK-DAG: %cmp3 = icmp sgt i32 10, %sub
|
|
; CHECK-ENABLED: br i1 %cmp1, label %[[IF_LICM:.*]], label %[[THEN_LICM:.*]]
|
|
entry:
|
|
br label %loop
|
|
|
|
; CHECK-ENABLED: [[IF_LICM]]:
|
|
; CHECK-ENABLED: br label %[[THEN_LICM:.*]]
|
|
|
|
; CHECK-ENABLED: [[ELSE_LICM]]:
|
|
; CHECK-ENABLED: br label %[[THEN_LICM]]
|
|
|
|
; CHECK-ENABLED: [[THEN_LICM]]
|
|
; CHECK-ENABLED: %phi = phi i32 [ %add, %[[IF_LICM]] ], [ %sub, %[[ELSE_LICM]] ]
|
|
; CHECK-ENABLED: %cmp4 = icmp ne i32 %phi, 0
|
|
; CHECK: br label %loop
|
|
|
|
loop:
|
|
%cmp1 = icmp sgt i32 %x, 0
|
|
br i1 %cmp1, label %if, label %else
|
|
|
|
if:
|
|
%add = add i32 %x, 1
|
|
%cmp2 = icmp sgt i32 10, %add
|
|
br i1 %cmp2, label %then, label %end
|
|
|
|
else:
|
|
%sub = sub i32 %x, 1
|
|
%cmp3 = icmp sgt i32 10, %sub
|
|
br i1 %cmp3, label %then, label %end
|
|
|
|
; CHECK-LABEL: then:
|
|
; CHECK-DISABLED: %phi = phi i32 [ %add, %if ], [ %sub, %else ]
|
|
; CHECK-DISABLED: %cmp4 = icmp ne i32 %phi, 0
|
|
then:
|
|
%phi = phi i32 [ %add, %if ], [ %sub, %else ]
|
|
store i32 %phi, i32* %p
|
|
%cmp4 = icmp ne i32 %phi, 0
|
|
br i1 %cmp4, label %loop, label %end
|
|
|
|
end:
|
|
ret void
|
|
}
|
|
|
|
; The store cannot be hoisted, so add and shr cannot be hoisted into a
|
|
; conditional block.
|
|
; CHECK-LABEL: @conditional_use
|
|
define void @conditional_use(i32 %x, i32* %p) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK-DAG: %cond = icmp ugt i32 %x, 0
|
|
; CHECK-DAG: %add = add i32 %x, 5
|
|
; CHECK-DAG: %shr = ashr i32 %add, 1
|
|
; CHECK: br label %loop
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
%cond = icmp ugt i32 %x, 0
|
|
br i1 %cond, label %if, label %else
|
|
|
|
; CHECK-LABEL: if:
|
|
; CHECK: store i32 %shr, i32* %p, align 4
|
|
if:
|
|
%add = add i32 %x, 5
|
|
%shr = ashr i32 %add, 1
|
|
store i32 %shr, i32* %p, align 4
|
|
br label %then
|
|
|
|
else:
|
|
br label %then
|
|
|
|
then:
|
|
br label %loop
|
|
}
|
|
|
|
; A diamond with two triangles on the left and one on the right. This test is
|
|
; to check that we have a unique loop preheader when we hoist the store (and so
|
|
; don't fail an assertion).
|
|
; CHECK-LABEL: @triangles_in_diamond
|
|
define void @triangles_in_diamond(i32* %ptr) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK: store i32 0, i32* %ptr, align 4
|
|
; CHECK: br label %loop
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
br i1 undef, label %left_triangle_1, label %right_triangle
|
|
|
|
left_triangle_1:
|
|
br i1 undef, label %left_triangle_1_if, label %left_triangle_2
|
|
|
|
left_triangle_1_if:
|
|
br label %left_triangle_2
|
|
|
|
left_triangle_2:
|
|
br i1 undef, label %left_triangle_2_if, label %left_triangle_2_then
|
|
|
|
left_triangle_2_if:
|
|
br label %left_triangle_2_then
|
|
|
|
left_triangle_2_then:
|
|
br label %loop.end
|
|
|
|
right_triangle:
|
|
br i1 undef, label %right_triangle.if, label %right_triangle.then
|
|
|
|
right_triangle.if:
|
|
br label %right_triangle.then
|
|
|
|
right_triangle.then:
|
|
br label %loop.end
|
|
|
|
loop.end:
|
|
store i32 0, i32* %ptr, align 4
|
|
br label %loop
|
|
}
|
|
|
|
; %cmp dominates its used after being hoisted, but not after %brmerge is rehoisted
|
|
; CHECK-LABEL: @rehoist
|
|
define void @rehoist(i8* %this, i32 %x) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK-DAG: %sub = add nsw i32 %x, -1
|
|
; CHECK-DAG: %fptr = bitcast i8* %this to void (i8*)*
|
|
; CHECK-DAG: %cmp = icmp eq i32 0, %sub
|
|
; CHECK-DAG: %brmerge = or i1 %cmp, true
|
|
entry:
|
|
%sub = add nsw i32 %x, -1
|
|
br label %loop
|
|
|
|
loop:
|
|
br i1 undef, label %if1, label %else1
|
|
|
|
if1:
|
|
%fptr = bitcast i8* %this to void (i8*)*
|
|
call void %fptr(i8* %this)
|
|
br label %then1
|
|
|
|
else1:
|
|
br label %then1
|
|
|
|
then1:
|
|
%cmp = icmp eq i32 0, %sub
|
|
br i1 %cmp, label %end, label %else2
|
|
|
|
else2:
|
|
%brmerge = or i1 %cmp, true
|
|
br i1 %brmerge, label %if3, label %end
|
|
|
|
if3:
|
|
br label %end
|
|
|
|
end:
|
|
br label %loop
|
|
}
|
|
|
|
; A test case that uses empty blocks in a way that can cause control flow
|
|
; hoisting to get confused.
|
|
; CHECK-LABEL: @empty_blocks_multiple_conditional_branches
|
|
define void @empty_blocks_multiple_conditional_branches(float %arg, float* %ptr) {
|
|
; CHECK-LABEL: entry
|
|
; CHECK-DAG: %div1 = fmul float %arg, 4.000000e+00
|
|
; CHECK-DAG: %div2 = fmul float %arg, 2.000000e+00
|
|
entry:
|
|
br label %loop
|
|
|
|
; The exact path to the phi isn't checked here, because it depends on whether
|
|
; cond2 or cond3 is hoisted first
|
|
; CHECK-ENABLED: %phi = phi float [ 0.000000e+00, %{{.*}} ], [ %div1, %{{.*}} ]
|
|
; CHECK: br label %loop
|
|
|
|
loop:
|
|
br i1 undef, label %backedge2, label %cond1
|
|
|
|
cond1:
|
|
br i1 undef, label %cond1.if, label %cond1.else
|
|
|
|
cond1.else:
|
|
br label %cond3
|
|
|
|
cond1.if:
|
|
br label %cond1.if.next
|
|
|
|
cond1.if.next:
|
|
br label %cond2
|
|
|
|
cond2:
|
|
%div1 = fmul float %arg, 4.000000e+00
|
|
br i1 undef, label %cond2.if, label %cond2.then
|
|
|
|
cond2.if:
|
|
br label %cond2.then
|
|
|
|
; CHECK-LABEL: cond2.then:
|
|
; CHECK-DISABLED: %phi = phi float [ 0.000000e+00, %cond2 ], [ %div1, %cond2.if ]
|
|
cond2.then:
|
|
%phi = phi float [ 0.000000e+00, %cond2 ], [ %div1, %cond2.if ]
|
|
store float %phi, float* %ptr
|
|
br label %backedge2
|
|
|
|
cond3:
|
|
br i1 undef, label %cond3.then, label %cond3.if
|
|
|
|
cond3.if:
|
|
%div2 = fmul float %arg, 2.000000e+00
|
|
store float %div2, float* %ptr
|
|
br label %cond3.then
|
|
|
|
cond3.then:
|
|
br label %loop
|
|
|
|
backedge2:
|
|
br label %loop
|
|
}
|
|
|
|
; We can't do much here, so mainly just check that we don't crash.
|
|
; CHECK-LABEL: @many_path_phi
|
|
define void @many_path_phi(i32* %ptr1, i32* %ptr2) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK-DAG: %gep3 = getelementptr inbounds i32, i32* %ptr2, i32 2
|
|
; CHECK-DAG: %gep2 = getelementptr inbounds i32, i32* %ptr2, i32 2
|
|
; CHECK: br label %loop
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
%phi1 = phi i32 [ 0, %entry ], [ %phi2, %end ]
|
|
%cmp1 = icmp ugt i32 %phi1, 3
|
|
br i1 %cmp1, label %cond2, label %cond1
|
|
|
|
cond1:
|
|
br i1 undef, label %end, label %cond1.else
|
|
|
|
cond1.else:
|
|
%gep2 = getelementptr inbounds i32, i32* %ptr2, i32 2
|
|
%val2 = load i32, i32* %gep2, align 4
|
|
%cmp2 = icmp eq i32 %val2, 13
|
|
br i1 %cmp2, label %cond1.end, label %end
|
|
|
|
cond1.end:
|
|
br label %end
|
|
|
|
cond2:
|
|
br i1 undef, label %end, label %cond2.else
|
|
|
|
cond2.else:
|
|
%gep3 = getelementptr inbounds i32, i32* %ptr2, i32 2
|
|
%val3 = load i32, i32* %gep3, align 4
|
|
%cmp3 = icmp eq i32 %val3, 13
|
|
br i1 %cmp3, label %cond2.end, label %end
|
|
|
|
cond2.end:
|
|
br label %end
|
|
|
|
end:
|
|
%phi2 = phi i32 [ 1, %cond1 ], [ 2, %cond1.else ], [ 3, %cond1.end ], [ 4, %cond2 ], [ 5, %cond2.else ], [ 6, %cond2.end ]
|
|
br label %loop
|
|
}
|
|
|
|
; Check that we correctly handle the hoisting of %gep when theres a critical
|
|
; edge that branches to the preheader.
|
|
; CHECK-LABEL: @crit_edge
|
|
define void @crit_edge(i32* %ptr, i32 %idx, i1 %cond1, i1 %cond2) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK: %gep = getelementptr inbounds i32, i32* %ptr, i32 %idx
|
|
; CHECK: br label %preheader
|
|
entry:
|
|
br label %preheader
|
|
|
|
preheader:
|
|
br label %loop
|
|
|
|
loop:
|
|
br i1 %cond1, label %then, label %if
|
|
|
|
if:
|
|
%gep = getelementptr inbounds i32, i32* %ptr, i32 %idx
|
|
%val = load i32, i32* %gep
|
|
br label %then
|
|
|
|
then:
|
|
%phi = phi i32 [ %val, %if ], [ 0, %loop ]
|
|
store i32 %phi, i32* %ptr
|
|
br i1 %cond2, label %loop, label %crit_edge
|
|
|
|
crit_edge:
|
|
br label %preheader
|
|
}
|
|
|
|
; Check that the conditional sub is correctly hoisted from the inner loop to the
|
|
; preheader of the outer loop.
|
|
; CHECK-LABEL: @hoist_from_innermost_loop
|
|
define void @hoist_from_innermost_loop(i32 %nx, i32* %ptr) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK-DAG: %sub = sub nsw i32 0, %nx
|
|
; CHECK: br label %outer_loop
|
|
entry:
|
|
br label %outer_loop
|
|
|
|
outer_loop:
|
|
br label %middle_loop
|
|
|
|
middle_loop:
|
|
br label %inner_loop
|
|
|
|
inner_loop:
|
|
br i1 undef, label %inner_loop_end, label %if
|
|
|
|
if:
|
|
%sub = sub nsw i32 0, %nx
|
|
store i32 %sub, i32* %ptr, align 4
|
|
br label %inner_loop_end
|
|
|
|
inner_loop_end:
|
|
br i1 undef, label %inner_loop, label %middle_loop_end
|
|
|
|
middle_loop_end:
|
|
br i1 undef, label %middle_loop, label %outer_loop_end
|
|
|
|
outer_loop_end:
|
|
br label %outer_loop
|
|
}
|
|
|
|
; We have a diamond starting from %if, but %if.if is also reachable from %loop,
|
|
; so %gep should not be conditionally hoisted.
|
|
; CHECK-LABEL: @diamond_with_extra_in_edge
|
|
define void @diamond_with_extra_in_edge(i32* %ptr1, i32* %ptr2, i32 %arg) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK-DAG: %cmp2 = icmp ne i32 0, %arg
|
|
; CHECK-DAG: %gep = getelementptr i32, i32* %ptr1, i32 4
|
|
; CHECK: br label %loop
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
%phi1 = phi i32 [ 0, %entry ], [ %phi2, %then ]
|
|
%cmp1 = icmp ugt i32 16, %phi1
|
|
br i1 %cmp1, label %if, label %if.if
|
|
|
|
if:
|
|
%cmp2 = icmp ne i32 0, %arg
|
|
br i1 %cmp2, label %if.if, label %if.else
|
|
|
|
if.if:
|
|
%gep = getelementptr i32, i32* %ptr1, i32 4
|
|
%val = load i32, i32* %gep, align 4
|
|
br label %then
|
|
|
|
if.else:
|
|
br label %then
|
|
|
|
then:
|
|
%phi2 = phi i32 [ %val, %if.if ], [ %phi1, %if.else ]
|
|
store i32 %phi2, i32* %ptr2, align 4
|
|
br label %loop
|
|
}
|
|
|
|
; %loop/%if/%then form a triangle, but %loop/%if/%then/%end also form a diamond.
|
|
; The triangle should be picked for conditional hoisting.
|
|
; CHECK-LABEL: @both_triangle_and_diamond
|
|
define void @both_triangle_and_diamond(i32* %ptr1, i32* %ptr2, i32 %arg) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK-DAG: %cmp1 = icmp ne i32 0, %arg
|
|
; CHECK-DAG: %gep = getelementptr i32, i32* %ptr1, i32 4
|
|
; CHECK-ENABLED: br i1 %cmp1, label %[[IF_LICM:.*]], label %[[THEN_LICM:.*]]
|
|
entry:
|
|
br label %loop
|
|
|
|
; CHECK-ENABLED: [[IF_LICM]]:
|
|
; CHECK-ENABLED: br label %[[THEN_LICM]]
|
|
|
|
; CHECK-ENABLED: [[THEN_LICM]]:
|
|
; CHECK-ENABLED: %phi2 = phi i32 [ 0, %[[IF_LICM]] ], [ 1, %entry ]
|
|
; CHECK: br label %loop
|
|
|
|
loop:
|
|
%phi1 = phi i32 [ 0, %entry ], [ %phi3, %end ]
|
|
%cmp1 = icmp ne i32 0, %arg
|
|
br i1 %cmp1, label %if, label %then
|
|
|
|
if:
|
|
%gep = getelementptr i32, i32* %ptr1, i32 4
|
|
%val = load i32, i32* %gep, align 4
|
|
%cmp2 = icmp ugt i32 16, %phi1
|
|
br i1 %cmp2, label %end, label %then
|
|
|
|
; CHECK-LABEL: then:
|
|
; CHECK-DISABLED: %phi2 = phi i32 [ 0, %if ], [ 1, %loop ]
|
|
then:
|
|
%phi2 = phi i32 [ 0, %if ], [ 1, %loop ]
|
|
br label %end
|
|
|
|
end:
|
|
%phi3 = phi i32 [ %phi2, %then ], [ %val, %if ]
|
|
store i32 %phi3, i32* %ptr2, align 4
|
|
br label %loop
|
|
}
|
|
|
|
; We shouldn't duplicate the branch at the end of %loop and should instead hoist
|
|
; %val to %entry.
|
|
; CHECK-LABEL: @same_destination_branch
|
|
define i32 @same_destination_branch(i32 %arg1, i32 %arg2) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK-DAG: %cmp1 = icmp ne i32 %arg2, 0
|
|
; CHECK-DAG: %val = add i32 %arg1, 1
|
|
; CHECK: br label %loop
|
|
entry:
|
|
br label %loop
|
|
|
|
; CHECK-LABEL: loop:
|
|
; CHECK: %phi = phi i32 [ 0, %entry ], [ %add, %then ]
|
|
loop:
|
|
%phi = phi i32 [ 0, %entry ], [ %add, %then ]
|
|
%add = add i32 %phi, 1
|
|
%cmp1 = icmp ne i32 %arg2, 0
|
|
br i1 %cmp1, label %if, label %if
|
|
|
|
if:
|
|
%val = add i32 %arg1, 1
|
|
br label %then
|
|
|
|
then:
|
|
%cmp2 = icmp ne i32 %val, %phi
|
|
br i1 %cmp2, label %loop, label %end
|
|
|
|
end:
|
|
ret i32 %val
|
|
}
|
|
|
|
; Diamond-like control flow but the left/right blocks actually have the same
|
|
; destinations.
|
|
; TODO: We could potentially hoist all of phi2-4, but currently only hoist phi2.
|
|
; CHECK-LABEL: @diamond_like_same_destinations
|
|
define i32 @diamond_like_same_destinations(i32 %arg1, i32 %arg2) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK-DAG: %cmp1 = icmp ne i32 %arg1, 0
|
|
; CHECK-DAG: %cmp2 = icmp ugt i32 %arg2, 1
|
|
; CHECK-DAG: %cmp3 = icmp ugt i32 %arg2, 2
|
|
; CHECK-ENABLED: br i1 %cmp1, label %[[LEFT1_LICM:.*]], label %[[RIGHT1_LICM:.*]]
|
|
entry:
|
|
br label %loop
|
|
|
|
; CHECK-ENABLED: [[LEFT1_LICM]]:
|
|
; CHECK-ENABLED: br label %[[LEFT2_LICM:.*]]
|
|
|
|
; CHECK-ENABLED: [[RIGHT1_LICM]]:
|
|
; CHECK-ENABLED: br label %[[LEFT2_LICM]]
|
|
|
|
; CHECK-ENABLED: [[LEFT2_LICM]]:
|
|
; CHECK-ENABLED: %phi2 = phi i32 [ 0, %[[LEFT1_LICM]] ], [ 1, %[[RIGHT1_LICM]] ]
|
|
; CHECK: br label %loop
|
|
|
|
loop:
|
|
%phi1 = phi i32 [ 0, %entry ], [ %add, %loopend ]
|
|
%add = add i32 %phi1, 1
|
|
%cmp1 = icmp ne i32 %arg1, 0
|
|
br i1 %cmp1, label %left1, label %right1
|
|
|
|
left1:
|
|
%cmp2 = icmp ugt i32 %arg2, 1
|
|
br i1 %cmp2, label %left2, label %right2
|
|
|
|
right1:
|
|
%cmp3 = icmp ugt i32 %arg2, 2
|
|
br i1 %cmp3, label %left2, label %right2
|
|
|
|
; CHECK-LABEL: left2:
|
|
; CHECK-DISABLED: %phi2 = phi i32 [ 0, %left1 ], [ 1, %right1 ]
|
|
left2:
|
|
%phi2 = phi i32 [ 0, %left1 ], [ 1, %right1 ]
|
|
br label %loopend
|
|
|
|
; CHECK-LABEL: right2:
|
|
; CHECK: %phi3 = phi i32 [ 2, %left1 ], [ 3, %right1 ]
|
|
right2:
|
|
%phi3 = phi i32 [ 2, %left1 ], [ 3, %right1 ]
|
|
br label %loopend
|
|
|
|
; CHECK-LABEL: loopend:
|
|
; CHECK: %phi4 = phi i32 [ %phi2, %left2 ], [ %phi3, %right2 ]
|
|
loopend:
|
|
%phi4 = phi i32 [ %phi2, %left2 ], [ %phi3, %right2 ]
|
|
%cmp4 = icmp ne i32 %phi1, 32
|
|
br i1 %cmp4, label %loop, label %end
|
|
|
|
end:
|
|
ret i32 %phi4
|
|
}
|
|
|
|
; A phi with multiple incoming values for the same block due to a branch with
|
|
; two destinations that are actually the same. We can't hoist this.
|
|
; TODO: This could be hoisted by erasing one of the incoming values.
|
|
; CHECK-LABEL: @phi_multiple_values_same_block
|
|
define i32 @phi_multiple_values_same_block(i32 %arg) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK: %cmp = icmp sgt i32 %arg, 4
|
|
; CHECK-NOT: phi
|
|
; CHECK: br label %loop
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
%cmp = icmp sgt i32 %arg, 4
|
|
br i1 %cmp, label %if, label %then
|
|
|
|
if:
|
|
br i1 undef, label %then, label %then
|
|
|
|
then:
|
|
%phi = phi i32 [ %arg, %loop ], [ 1, %if ], [ 1, %if ]
|
|
br i1 undef, label %exit, label %loop
|
|
|
|
exit:
|
|
ret i32 %phi
|
|
}
|
|
|
|
; %phi is conditionally used in %d, and the store that %d is used in cannot be
|
|
; hoisted. This means that we have to rehoist %d, but have to make sure to
|
|
; rehoist it after %phi.
|
|
; CHECK-LABEL: @phi_conditional_use
|
|
define i64 @phi_conditional_use(i32 %f, i32* %g) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK: %cmp1 = icmp eq i32 %f, 1
|
|
; CHECK: %cmp2 = icmp eq i32 %f, 0
|
|
; CHECK-ENABLED: br i1 %cmp1, label %[[IF_END_LICM:.*]], label %[[IF_THEN_LICM:.*]]
|
|
entry:
|
|
%cmp1 = icmp eq i32 %f, 1
|
|
%cmp2 = icmp eq i32 %f, 0
|
|
br label %loop
|
|
|
|
; CHECK-ENABLED: [[IF_THEN_LICM]]:
|
|
; CHECK-ENABLED: br label %[[IF_END_LICM]]
|
|
|
|
; CHECK-ENABLED: [[IF_END_LICM]]:
|
|
; CHECK-ENABLED: %phi = phi i64 [ 0, %entry ], [ 1, %[[IF_THEN_LICM]] ]
|
|
; CHECK-ENABLED: %d = getelementptr inbounds i32, i32* %g, i64 %phi
|
|
; CHECK-ENABLED: i1 %cmp2, label %[[LOOP_BACKEDGE_LICM:.*]], label %[[IF_THEN2_LICM:.*]]
|
|
|
|
; CHECK-ENABLED: [[IF_THEN2_LICM]]:
|
|
; CHECK-ENABLED: br label %[[LOOP_BACKEDGE_LICM]]
|
|
|
|
; CHECK-ENABLED: [[LOOP_BACKEDGE_LICM]]:
|
|
; CHECK: br label %loop
|
|
|
|
loop:
|
|
br i1 %cmp1, label %if.end, label %if.then
|
|
|
|
if.then:
|
|
br label %if.end
|
|
|
|
; CHECK-LABEL: if.end:
|
|
; CHECK-DISABLED: %phi = phi i64 [ 0, %loop ], [ 1, %if.then ]
|
|
if.end:
|
|
%phi = phi i64 [ 0, %loop ], [ 1, %if.then ]
|
|
br i1 %cmp2, label %loop.backedge, label %if.then2
|
|
|
|
; CHECK-LABEL: if.then2:
|
|
; CHECK-DISABLED: %d = getelementptr inbounds i32, i32* %g, i64 %phi
|
|
if.then2:
|
|
%d = getelementptr inbounds i32, i32* %g, i64 %phi
|
|
store i32 1, i32* %d, align 4
|
|
br label %loop.backedge
|
|
|
|
loop.backedge:
|
|
br label %loop
|
|
}
|
|
|
|
; As above, but we have two such phis
|
|
; CHECK-LABEL: @phi_conditional_use_twice
|
|
define i64 @phi_conditional_use_twice(i32 %f, i32* %g) {
|
|
; CHECK-LABEL: entry:
|
|
; CHECK: %cmp1 = icmp eq i32 %f, 1
|
|
; CHECK: %cmp2 = icmp eq i32 %f, 0
|
|
; CHECK-ENABLED: br i1 %cmp1, label %[[IF_END_LICM:.*]], label %[[IF_THEN_LICM:.*]]
|
|
entry:
|
|
%cmp1 = icmp eq i32 %f, 1
|
|
%cmp2 = icmp eq i32 %f, 0
|
|
%cmp3 = icmp sgt i32 %f, 0
|
|
br label %loop
|
|
|
|
; CHECK-ENABLED: [[IF_THEN_LICM]]:
|
|
; CHECK-ENABLED: br label %[[IF_END_LICM]]
|
|
|
|
; CHECK-ENABLED: [[IF_END_LICM]]:
|
|
; CHECK-ENABLED: %phi1 = phi i64 [ 0, %entry ], [ 1, %[[IF_THEN_LICM]] ]
|
|
; CHECK-ENABLED: %d = getelementptr inbounds i32, i32* %g, i64 %phi1
|
|
; CHECK-ENABLED: i1 %cmp2, label %[[IF_END2_LICM:.*]], label %[[IF_THEN2_LICM:.*]]
|
|
|
|
; CHECK-ENABLED: [[IF_THEN2_LICM]]:
|
|
; CHECK-ENABLED: br label %[[IF_END2_LICM]]
|
|
|
|
; CHECK-ENABLED: [[IF_END2_LICM]]:
|
|
; CHECK-ENABLED: %phi2 = phi i64 [ 2, %[[IF_END_LICM]] ], [ 3, %[[IF_THEN2_LICM]] ]
|
|
; CHECK-ENABLED: %e = getelementptr inbounds i32, i32* %g, i64 %phi2
|
|
; CHECK-ENABLED: i1 %cmp3, label %[[LOOP_BACKEDGE_LICM:.*]], label %[[IF_THEN3_LICM:.*]]
|
|
|
|
; CHECK-ENABLED: [[IF_THEN3_LICM]]:
|
|
; CHECK-ENABLED: br label %[[LOOP_BACKEDGE_LICM]]
|
|
|
|
; CHECK-ENABLED: [[LOOP_BACKEDGE_LICM]]:
|
|
; CHECK: br label %loop
|
|
|
|
loop:
|
|
br i1 %cmp1, label %if.end, label %if.then
|
|
|
|
if.then:
|
|
br label %if.end
|
|
|
|
; CHECK-LABEL: if.end:
|
|
; CHECK-DISABLED: %phi1 = phi i64 [ 0, %loop ], [ 1, %if.then ]
|
|
if.end:
|
|
%phi1 = phi i64 [ 0, %loop ], [ 1, %if.then ]
|
|
br i1 %cmp2, label %if.end2, label %if.then2
|
|
|
|
; CHECK-LABEL: if.then2:
|
|
; CHECK-DISABLED: %d = getelementptr inbounds i32, i32* %g, i64 %phi1
|
|
if.then2:
|
|
%d = getelementptr inbounds i32, i32* %g, i64 %phi1
|
|
store i32 1, i32* %d, align 4
|
|
br label %if.end2
|
|
|
|
; CHECK-LABEL: if.end2:
|
|
; CHECK-DISABLED: %phi2 = phi i64 [ 2, %if.end ], [ 3, %if.then2 ]
|
|
if.end2:
|
|
%phi2 = phi i64 [ 2, %if.end ], [ 3, %if.then2 ]
|
|
br i1 %cmp3, label %loop.backedge, label %if.then3
|
|
|
|
; CHECK-LABEL: if.then3:
|
|
; CHECK-DISABLED: %e = getelementptr inbounds i32, i32* %g, i64 %phi2
|
|
if.then3:
|
|
%e = getelementptr inbounds i32, i32* %g, i64 %phi2
|
|
store i32 1, i32* %e, align 4
|
|
br label %loop.backedge
|
|
|
|
loop.backedge:
|
|
br label %loop
|
|
}
|