forked from OSchip/llvm-project
398 lines
9.8 KiB
LLVM
398 lines
9.8 KiB
LLVM
; RUN: opt < %s -basicaa -licm -S | FileCheck %s
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declare i32 @strlen(i8*) readonly
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declare void @foo()
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; Sink readonly function.
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define i32 @test1(i8* %P) {
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br label %Loop
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Loop: ; preds = %Loop, %0
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%A = call i32 @strlen( i8* %P ) readonly
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br i1 false, label %Loop, label %Out
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Out: ; preds = %Loop
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ret i32 %A
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; CHECK-LABEL: @test1(
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; CHECK: Out:
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; CHECK-NEXT: call i32 @strlen
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; CHECK-NEXT: ret i32 %A
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}
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declare double @sin(double) readnone
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; Sink readnone function out of loop with unknown memory behavior.
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define double @test2(double %X) {
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br label %Loop
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Loop: ; preds = %Loop, %0
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call void @foo( )
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%A = call double @sin( double %X ) readnone
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br i1 true, label %Loop, label %Out
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Out: ; preds = %Loop
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ret double %A
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; CHECK-LABEL: @test2(
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; CHECK: Out:
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; CHECK-NEXT: call double @sin
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; CHECK-NEXT: ret double %A
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}
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; This testcase checks to make sure the sinker does not cause problems with
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; critical edges.
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define void @test3() {
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Entry:
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br i1 false, label %Loop, label %Exit
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Loop:
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%X = add i32 0, 1
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br i1 false, label %Loop, label %Exit
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Exit:
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%Y = phi i32 [ 0, %Entry ], [ %X, %Loop ]
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ret void
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; CHECK-LABEL: @test3(
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; CHECK: Exit.loopexit:
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; CHECK-NEXT: %X.le = add i32 0, 1
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; CHECK-NEXT: br label %Exit
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}
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; If the result of an instruction is only used outside of the loop, sink
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; the instruction to the exit blocks instead of executing it on every
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; iteration of the loop.
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;
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define i32 @test4(i32 %N) {
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Entry:
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br label %Loop
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Loop: ; preds = %Loop, %Entry
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%N_addr.0.pn = phi i32 [ %dec, %Loop ], [ %N, %Entry ]
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%tmp.6 = mul i32 %N, %N_addr.0.pn ; <i32> [#uses=1]
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%tmp.7 = sub i32 %tmp.6, %N ; <i32> [#uses=1]
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%dec = add i32 %N_addr.0.pn, -1 ; <i32> [#uses=1]
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%tmp.1 = icmp ne i32 %N_addr.0.pn, 1 ; <i1> [#uses=1]
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br i1 %tmp.1, label %Loop, label %Out
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Out: ; preds = %Loop
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ret i32 %tmp.7
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; CHECK-LABEL: @test4(
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; CHECK: Out:
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; CHECK-NEXT: %[[LCSSAPHI:.*]] = phi i32 [ %N_addr.0.pn
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; CHECK-NEXT: mul i32 %N, %[[LCSSAPHI]]
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; CHECK-NEXT: sub i32 %tmp.6.le, %N
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; CHECK-NEXT: ret i32
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}
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; To reduce register pressure, if a load is hoistable out of the loop, and the
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; result of the load is only used outside of the loop, sink the load instead of
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; hoisting it!
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;
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@X = global i32 5 ; <i32*> [#uses=1]
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define i32 @test5(i32 %N) {
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Entry:
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br label %Loop
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Loop: ; preds = %Loop, %Entry
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%N_addr.0.pn = phi i32 [ %dec, %Loop ], [ %N, %Entry ]
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%tmp.6 = load i32* @X ; <i32> [#uses=1]
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%dec = add i32 %N_addr.0.pn, -1 ; <i32> [#uses=1]
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%tmp.1 = icmp ne i32 %N_addr.0.pn, 1 ; <i1> [#uses=1]
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br i1 %tmp.1, label %Loop, label %Out
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Out: ; preds = %Loop
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ret i32 %tmp.6
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; CHECK-LABEL: @test5(
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; CHECK: Out:
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; CHECK-NEXT: %tmp.6.le = load i32* @X
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; CHECK-NEXT: ret i32 %tmp.6.le
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}
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; The loop sinker was running from the bottom of the loop to the top, causing
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; it to miss opportunities to sink instructions that depended on sinking other
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; instructions from the loop. Instead they got hoisted, which is better than
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; leaving them in the loop, but increases register pressure pointlessly.
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%Ty = type { i32, i32 }
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@X2 = external global %Ty
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define i32 @test6() {
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br label %Loop
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Loop:
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%dead = getelementptr %Ty* @X2, i64 0, i32 0
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%sunk2 = load i32* %dead
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br i1 false, label %Loop, label %Out
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Out: ; preds = %Loop
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ret i32 %sunk2
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; CHECK-LABEL: @test6(
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; CHECK: Out:
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; CHECK-NEXT: %dead.le = getelementptr %Ty* @X2, i64 0, i32 0
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; CHECK-NEXT: %sunk2.le = load i32* %dead.le
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; CHECK-NEXT: ret i32 %sunk2.le
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}
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; This testcase ensures that we can sink instructions from loops with
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; multiple exits.
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;
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define i32 @test7(i32 %N, i1 %C) {
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Entry:
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br label %Loop
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Loop: ; preds = %ContLoop, %Entry
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%N_addr.0.pn = phi i32 [ %dec, %ContLoop ], [ %N, %Entry ]
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%tmp.6 = mul i32 %N, %N_addr.0.pn
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%tmp.7 = sub i32 %tmp.6, %N ; <i32> [#uses=2]
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%dec = add i32 %N_addr.0.pn, -1 ; <i32> [#uses=1]
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br i1 %C, label %ContLoop, label %Out1
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ContLoop:
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%tmp.1 = icmp ne i32 %N_addr.0.pn, 1
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br i1 %tmp.1, label %Loop, label %Out2
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Out1: ; preds = %Loop
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ret i32 %tmp.7
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Out2: ; preds = %ContLoop
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ret i32 %tmp.7
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; CHECK-LABEL: @test7(
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; CHECK: Out1:
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; CHECK-NEXT: %[[LCSSAPHI:.*]] = phi i32 [ %N_addr.0.pn
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; CHECK-NEXT: mul i32 %N, %[[LCSSAPHI]]
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; CHECK-NEXT: sub i32 %tmp.6.le, %N
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; CHECK-NEXT: ret
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; CHECK: Out2:
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; CHECK-NEXT: %[[LCSSAPHI:.*]] = phi i32 [ %N_addr.0.pn
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; CHECK-NEXT: mul i32 %N, %[[LCSSAPHI]]
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; CHECK-NEXT: sub i32 %tmp.6.le4, %N
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; CHECK-NEXT: ret
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}
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; This testcase checks to make sure we can sink values which are only live on
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; some exits out of the loop, and that we can do so without breaking dominator
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; info.
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define i32 @test8(i1 %C1, i1 %C2, i32* %P, i32* %Q) {
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Entry:
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br label %Loop
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Loop: ; preds = %Cont, %Entry
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br i1 %C1, label %Cont, label %exit1
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Cont: ; preds = %Loop
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%X = load i32* %P ; <i32> [#uses=2]
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store i32 %X, i32* %Q
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%V = add i32 %X, 1 ; <i32> [#uses=1]
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br i1 %C2, label %Loop, label %exit2
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exit1: ; preds = %Loop
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ret i32 0
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exit2: ; preds = %Cont
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ret i32 %V
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; CHECK-LABEL: @test8(
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; CHECK: exit1:
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; CHECK-NEXT: ret i32 0
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; CHECK: exit2:
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; CHECK-NEXT: %[[LCSSAPHI:.*]] = phi i32 [ %X
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; CHECK-NEXT: %V.le = add i32 %[[LCSSAPHI]], 1
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; CHECK-NEXT: ret i32 %V.le
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}
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define void @test9() {
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loopentry.2.i:
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br i1 false, label %no_exit.1.i.preheader, label %loopentry.3.i.preheader
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no_exit.1.i.preheader: ; preds = %loopentry.2.i
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br label %no_exit.1.i
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no_exit.1.i: ; preds = %endif.8.i, %no_exit.1.i.preheader
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br i1 false, label %return.i, label %endif.8.i
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endif.8.i: ; preds = %no_exit.1.i
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%inc.1.i = add i32 0, 1 ; <i32> [#uses=1]
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br i1 false, label %no_exit.1.i, label %loopentry.3.i.preheader.loopexit
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loopentry.3.i.preheader.loopexit: ; preds = %endif.8.i
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br label %loopentry.3.i.preheader
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loopentry.3.i.preheader: ; preds = %loopentry.3.i.preheader.loopexit, %loopentry.2.i
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%arg_num.0.i.ph13000 = phi i32 [ 0, %loopentry.2.i ], [ %inc.1.i, %loopentry.3.i.preheader.loopexit ] ; <i32> [#uses=0]
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ret void
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return.i: ; preds = %no_exit.1.i
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ret void
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; CHECK-LABEL: @test9(
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; CHECK: loopentry.3.i.preheader.loopexit:
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; CHECK-NEXT: %inc.1.i.le = add i32 0, 1
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; CHECK-NEXT: br label %loopentry.3.i.preheader
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}
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; Potentially trapping instructions may be sunk as long as they are guaranteed
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; to be executed.
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define i32 @test10(i32 %N) {
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Entry:
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br label %Loop
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Loop: ; preds = %Loop, %Entry
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%N_addr.0.pn = phi i32 [ %dec, %Loop ], [ %N, %Entry ] ; <i32> [#uses=3]
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%tmp.6 = sdiv i32 %N, %N_addr.0.pn ; <i32> [#uses=1]
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%dec = add i32 %N_addr.0.pn, -1 ; <i32> [#uses=1]
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%tmp.1 = icmp ne i32 %N_addr.0.pn, 0 ; <i1> [#uses=1]
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br i1 %tmp.1, label %Loop, label %Out
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Out: ; preds = %Loop
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ret i32 %tmp.6
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; CHECK-LABEL: @test10(
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; CHECK: Out:
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; CHECK-NEXT: %[[LCSSAPHI:.*]] = phi i32 [ %N_addr.0.pn
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; CHECK-NEXT: %tmp.6.le = sdiv i32 %N, %[[LCSSAPHI]]
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; CHECK-NEXT: ret i32 %tmp.6.le
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}
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; Should delete, not sink, dead instructions.
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define void @test11() {
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br label %Loop
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Loop:
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%dead = getelementptr %Ty* @X2, i64 0, i32 0
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br i1 false, label %Loop, label %Out
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Out:
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ret void
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; CHECK-LABEL: @test11(
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; CHECK: Out:
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; CHECK-NEXT: ret void
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}
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@c = common global [1 x i32] zeroinitializer, align 4
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; Test a *many* way nested loop with multiple exit blocks both of which exit
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; multiple loop nests. This exercises LCSSA corner cases.
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define i32 @PR18753(i1* %a, i1* %b, i1* %c, i1* %d) {
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entry:
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br label %l1.header
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l1.header:
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%iv = phi i64 [ %iv.next, %l1.latch ], [ 0, %entry ]
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%arrayidx.i = getelementptr inbounds [1 x i32]* @c, i64 0, i64 %iv
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br label %l2.header
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l2.header:
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%x0 = load i1* %c, align 4
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br i1 %x0, label %l1.latch, label %l3.preheader
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l3.preheader:
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br label %l3.header
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l3.header:
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%x1 = load i1* %d, align 4
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br i1 %x1, label %l2.latch, label %l4.preheader
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l4.preheader:
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br label %l4.header
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l4.header:
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%x2 = load i1* %a
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br i1 %x2, label %l3.latch, label %l4.body
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l4.body:
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call void @f(i32* %arrayidx.i)
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%x3 = load i1* %b
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%l = trunc i64 %iv to i32
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br i1 %x3, label %l4.latch, label %exit
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l4.latch:
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call void @g()
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%x4 = load i1* %b, align 4
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br i1 %x4, label %l4.header, label %exit
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l3.latch:
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br label %l3.header
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l2.latch:
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br label %l2.header
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l1.latch:
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%iv.next = add nsw i64 %iv, 1
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br label %l1.header
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exit:
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%lcssa = phi i32 [ %l, %l4.latch ], [ %l, %l4.body ]
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; CHECK-LABEL: @PR18753(
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; CHECK: exit:
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; CHECK-NEXT: %[[LCSSAPHI:.*]] = phi i64 [ %iv, %l4.latch ], [ %iv, %l4.body ]
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; CHECK-NEXT: %l.le = trunc i64 %[[LCSSAPHI]] to i32
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; CHECK-NEXT: ret i32 %l.le
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ret i32 %lcssa
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}
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; Can't sink stores out of exit blocks containing indirectbr instructions
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; because loop simplify does not create dedicated exits for such blocks. Test
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; that by sinking the store from lab21 to lab22, but not further.
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define void @test12() {
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; CHECK-LABEL: @test12
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br label %lab4
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lab4:
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br label %lab20
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lab5:
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br label %lab20
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lab6:
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br label %lab4
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lab7:
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br i1 undef, label %lab8, label %lab13
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lab8:
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br i1 undef, label %lab13, label %lab10
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lab10:
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br label %lab7
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lab13:
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ret void
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lab20:
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br label %lab21
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lab21:
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; CHECK: lab21:
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; CHECK-NOT: store
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; CHECK: br i1 false, label %lab21, label %lab22
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store i32 36127957, i32* undef, align 4
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br i1 undef, label %lab21, label %lab22
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lab22:
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; CHECK: lab22:
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; CHECK: store
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; CHECK-NEXT: indirectbr i8* undef
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indirectbr i8* undef, [label %lab5, label %lab6, label %lab7]
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}
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; Test that we don't crash when trying to sink stores and there's no preheader
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; available (which is used for creating loads that may be used by the SSA
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; updater)
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define void @test13() {
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; CHECK-LABEL: @test13
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br label %lab59
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lab19:
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br i1 undef, label %lab20, label %lab38
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lab20:
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br label %lab60
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lab21:
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br i1 undef, label %lab22, label %lab38
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lab22:
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br label %lab38
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lab38:
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ret void
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lab59:
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indirectbr i8* undef, [label %lab60, label %lab38]
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lab60:
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; CHECK: lab60:
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; CHECK: store
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; CHECK-NEXT: indirectbr
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store i32 2145244101, i32* undef, align 4
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indirectbr i8* undef, [label %lab21, label %lab19]
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}
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declare void @f(i32*)
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declare void @g()
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