forked from OSchip/llvm-project
504 lines
12 KiB
LLVM
504 lines
12 KiB
LLVM
; RUN: opt < %s -sroa -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-n8:16:32:64"
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define i32 @test1() {
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; CHECK-LABEL: @test1(
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entry:
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%a = alloca [2 x i32]
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; CHECK-NOT: alloca
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%a0 = getelementptr [2 x i32]* %a, i64 0, i32 0
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%a1 = getelementptr [2 x i32]* %a, i64 0, i32 1
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store i32 0, i32* %a0
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store i32 1, i32* %a1
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%v0 = load i32* %a0
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%v1 = load i32* %a1
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; CHECK-NOT: store
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; CHECK-NOT: load
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%cond = icmp sle i32 %v0, %v1
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br i1 %cond, label %then, label %exit
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then:
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br label %exit
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exit:
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%phi = phi i32* [ %a1, %then ], [ %a0, %entry ]
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; CHECK: phi i32 [ 1, %{{.*}} ], [ 0, %{{.*}} ]
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%result = load i32* %phi
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ret i32 %result
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}
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define i32 @test2() {
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; CHECK-LABEL: @test2(
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entry:
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%a = alloca [2 x i32]
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; CHECK-NOT: alloca
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%a0 = getelementptr [2 x i32]* %a, i64 0, i32 0
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%a1 = getelementptr [2 x i32]* %a, i64 0, i32 1
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store i32 0, i32* %a0
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store i32 1, i32* %a1
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%v0 = load i32* %a0
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%v1 = load i32* %a1
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; CHECK-NOT: store
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; CHECK-NOT: load
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%cond = icmp sle i32 %v0, %v1
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%select = select i1 %cond, i32* %a1, i32* %a0
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; CHECK: select i1 %{{.*}}, i32 1, i32 0
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%result = load i32* %select
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ret i32 %result
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}
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define i32 @test3(i32 %x) {
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; CHECK-LABEL: @test3(
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entry:
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%a = alloca [2 x i32]
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; CHECK-NOT: alloca
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; Note that we build redundant GEPs here to ensure that having different GEPs
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; into the same alloca partation continues to work with PHI speculation. This
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; was the underlying cause of PR13926.
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%a0 = getelementptr [2 x i32]* %a, i64 0, i32 0
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%a0b = getelementptr [2 x i32]* %a, i64 0, i32 0
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%a1 = getelementptr [2 x i32]* %a, i64 0, i32 1
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%a1b = getelementptr [2 x i32]* %a, i64 0, i32 1
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store i32 0, i32* %a0
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store i32 1, i32* %a1
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; CHECK-NOT: store
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switch i32 %x, label %bb0 [ i32 1, label %bb1
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i32 2, label %bb2
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i32 3, label %bb3
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i32 4, label %bb4
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i32 5, label %bb5
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i32 6, label %bb6
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i32 7, label %bb7 ]
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bb0:
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br label %exit
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bb1:
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br label %exit
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bb2:
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br label %exit
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bb3:
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br label %exit
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bb4:
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br label %exit
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bb5:
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br label %exit
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bb6:
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br label %exit
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bb7:
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br label %exit
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exit:
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%phi = phi i32* [ %a1, %bb0 ], [ %a0, %bb1 ], [ %a0, %bb2 ], [ %a1, %bb3 ],
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[ %a1b, %bb4 ], [ %a0b, %bb5 ], [ %a0b, %bb6 ], [ %a1b, %bb7 ]
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; CHECK: phi i32 [ 1, %{{.*}} ], [ 0, %{{.*}} ], [ 0, %{{.*}} ], [ 1, %{{.*}} ], [ 1, %{{.*}} ], [ 0, %{{.*}} ], [ 0, %{{.*}} ], [ 1, %{{.*}} ]
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%result = load i32* %phi
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ret i32 %result
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}
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define i32 @test4() {
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; CHECK-LABEL: @test4(
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entry:
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%a = alloca [2 x i32]
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; CHECK-NOT: alloca
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%a0 = getelementptr [2 x i32]* %a, i64 0, i32 0
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%a1 = getelementptr [2 x i32]* %a, i64 0, i32 1
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store i32 0, i32* %a0
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store i32 1, i32* %a1
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%v0 = load i32* %a0
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%v1 = load i32* %a1
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; CHECK-NOT: store
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; CHECK-NOT: load
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%cond = icmp sle i32 %v0, %v1
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%select = select i1 %cond, i32* %a0, i32* %a0
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; CHECK-NOT: select
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%result = load i32* %select
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ret i32 %result
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; CHECK: ret i32 0
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}
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define i32 @test5(i32* %b) {
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; CHECK-LABEL: @test5(
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entry:
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%a = alloca [2 x i32]
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; CHECK-NOT: alloca
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%a1 = getelementptr [2 x i32]* %a, i64 0, i32 1
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store i32 1, i32* %a1
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; CHECK-NOT: store
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%select = select i1 true, i32* %a1, i32* %b
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; CHECK-NOT: select
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%result = load i32* %select
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; CHECK-NOT: load
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ret i32 %result
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; CHECK: ret i32 1
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}
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declare void @f(i32*, i32*)
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define i32 @test6(i32* %b) {
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; CHECK-LABEL: @test6(
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entry:
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%a = alloca [2 x i32]
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%c = alloca i32
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; CHECK-NOT: alloca
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%a1 = getelementptr [2 x i32]* %a, i64 0, i32 1
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store i32 1, i32* %a1
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%select = select i1 true, i32* %a1, i32* %b
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%select2 = select i1 false, i32* %a1, i32* %b
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%select3 = select i1 false, i32* %c, i32* %b
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; CHECK: %[[select2:.*]] = select i1 false, i32* undef, i32* %b
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; CHECK: %[[select3:.*]] = select i1 false, i32* undef, i32* %b
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; Note, this would potentially escape the alloca pointer except for the
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; constant folding of the select.
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call void @f(i32* %select2, i32* %select3)
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; CHECK: call void @f(i32* %[[select2]], i32* %[[select3]])
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%result = load i32* %select
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; CHECK-NOT: load
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%dead = load i32* %c
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ret i32 %result
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; CHECK: ret i32 1
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}
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define i32 @test7() {
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; CHECK-LABEL: @test7(
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; CHECK-NOT: alloca
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entry:
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%X = alloca i32
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br i1 undef, label %good, label %bad
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good:
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%Y1 = getelementptr i32* %X, i64 0
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store i32 0, i32* %Y1
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br label %exit
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bad:
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%Y2 = getelementptr i32* %X, i64 1
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store i32 0, i32* %Y2
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br label %exit
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exit:
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%P = phi i32* [ %Y1, %good ], [ %Y2, %bad ]
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; CHECK: %[[phi:.*]] = phi i32 [ 0, %good ],
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%Z2 = load i32* %P
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ret i32 %Z2
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; CHECK: ret i32 %[[phi]]
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}
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define i32 @test8(i32 %b, i32* %ptr) {
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; Ensure that we rewrite allocas to the used type when that use is hidden by
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; a PHI that can be speculated.
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; CHECK-LABEL: @test8(
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; CHECK-NOT: alloca
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; CHECK-NOT: load
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; CHECK: %[[value:.*]] = load i32* %ptr
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; CHECK-NOT: load
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; CHECK: %[[result:.*]] = phi i32 [ undef, %else ], [ %[[value]], %then ]
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; CHECK-NEXT: ret i32 %[[result]]
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entry:
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%f = alloca float
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%test = icmp ne i32 %b, 0
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br i1 %test, label %then, label %else
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then:
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br label %exit
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else:
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%bitcast = bitcast float* %f to i32*
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br label %exit
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exit:
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%phi = phi i32* [ %bitcast, %else ], [ %ptr, %then ]
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%loaded = load i32* %phi, align 4
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ret i32 %loaded
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}
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define i32 @test9(i32 %b, i32* %ptr) {
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; Same as @test8 but for a select rather than a PHI node.
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; CHECK-LABEL: @test9(
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; CHECK-NOT: alloca
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; CHECK-NOT: load
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; CHECK: %[[value:.*]] = load i32* %ptr
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; CHECK-NOT: load
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; CHECK: %[[result:.*]] = select i1 %{{.*}}, i32 undef, i32 %[[value]]
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; CHECK-NEXT: ret i32 %[[result]]
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entry:
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%f = alloca float
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store i32 0, i32* %ptr
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%test = icmp ne i32 %b, 0
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%bitcast = bitcast float* %f to i32*
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%select = select i1 %test, i32* %bitcast, i32* %ptr
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%loaded = load i32* %select, align 4
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ret i32 %loaded
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}
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define float @test10(i32 %b, float* %ptr) {
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; Don't try to promote allocas which are not elligible for it even after
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; rewriting due to the necessity of inserting bitcasts when speculating a PHI
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; node.
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; CHECK-LABEL: @test10(
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; CHECK: %[[alloca:.*]] = alloca
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; CHECK: %[[argvalue:.*]] = load float* %ptr
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; CHECK: %[[cast:.*]] = bitcast double* %[[alloca]] to float*
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; CHECK: %[[allocavalue:.*]] = load float* %[[cast]]
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; CHECK: %[[result:.*]] = phi float [ %[[allocavalue]], %else ], [ %[[argvalue]], %then ]
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; CHECK-NEXT: ret float %[[result]]
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entry:
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%f = alloca double
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store double 0.0, double* %f
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%test = icmp ne i32 %b, 0
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br i1 %test, label %then, label %else
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then:
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br label %exit
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else:
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%bitcast = bitcast double* %f to float*
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br label %exit
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exit:
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%phi = phi float* [ %bitcast, %else ], [ %ptr, %then ]
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%loaded = load float* %phi, align 4
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ret float %loaded
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}
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define float @test11(i32 %b, float* %ptr) {
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; Same as @test10 but for a select rather than a PHI node.
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; CHECK-LABEL: @test11(
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; CHECK: %[[alloca:.*]] = alloca
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; CHECK: %[[cast:.*]] = bitcast double* %[[alloca]] to float*
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; CHECK: %[[allocavalue:.*]] = load float* %[[cast]]
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; CHECK: %[[argvalue:.*]] = load float* %ptr
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; CHECK: %[[result:.*]] = select i1 %{{.*}}, float %[[allocavalue]], float %[[argvalue]]
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; CHECK-NEXT: ret float %[[result]]
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entry:
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%f = alloca double
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store double 0.0, double* %f
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store float 0.0, float* %ptr
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%test = icmp ne i32 %b, 0
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%bitcast = bitcast double* %f to float*
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%select = select i1 %test, float* %bitcast, float* %ptr
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%loaded = load float* %select, align 4
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ret float %loaded
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}
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define i32 @test12(i32 %x, i32* %p) {
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; Ensure we don't crash or fail to nuke dead selects of allocas if no load is
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; never found.
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; CHECK-LABEL: @test12(
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; CHECK-NOT: alloca
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; CHECK-NOT: select
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; CHECK: ret i32 %x
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entry:
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%a = alloca i32
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store i32 %x, i32* %a
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%dead = select i1 undef, i32* %a, i32* %p
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%load = load i32* %a
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ret i32 %load
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}
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define i32 @test13(i32 %x, i32* %p) {
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; Ensure we don't crash or fail to nuke dead phis of allocas if no load is ever
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; found.
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; CHECK-LABEL: @test13(
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; CHECK-NOT: alloca
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; CHECK-NOT: phi
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; CHECK: ret i32 %x
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entry:
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%a = alloca i32
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store i32 %x, i32* %a
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br label %loop
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loop:
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%phi = phi i32* [ %p, %entry ], [ %a, %loop ]
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br i1 undef, label %loop, label %exit
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exit:
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%load = load i32* %a
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ret i32 %load
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}
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define i32 @test14(i1 %b1, i1 %b2, i32* %ptr) {
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; Check for problems when there are both selects and phis and one is
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; speculatable toward promotion but the other is not. That should block all of
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; the speculation.
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; CHECK-LABEL: @test14(
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; CHECK: alloca
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; CHECK: alloca
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; CHECK: select
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; CHECK: phi
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; CHECK: phi
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; CHECK: select
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; CHECK: ret i32
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entry:
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%f = alloca i32
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%g = alloca i32
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store i32 0, i32* %f
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store i32 0, i32* %g
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%f.select = select i1 %b1, i32* %f, i32* %ptr
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br i1 %b2, label %then, label %else
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then:
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br label %exit
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else:
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br label %exit
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exit:
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%f.phi = phi i32* [ %f, %then ], [ %f.select, %else ]
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%g.phi = phi i32* [ %g, %then ], [ %ptr, %else ]
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%f.loaded = load i32* %f.phi
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%g.select = select i1 %b1, i32* %g, i32* %g.phi
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%g.loaded = load i32* %g.select
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%result = add i32 %f.loaded, %g.loaded
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ret i32 %result
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}
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define i32 @PR13905() {
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; Check a pattern where we have a chain of dead phi nodes to ensure they are
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; deleted and promotion can proceed.
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; CHECK-LABEL: @PR13905(
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; CHECK-NOT: alloca i32
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; CHECK: ret i32 undef
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entry:
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%h = alloca i32
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store i32 0, i32* %h
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br i1 undef, label %loop1, label %exit
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loop1:
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%phi1 = phi i32* [ null, %entry ], [ %h, %loop1 ], [ %h, %loop2 ]
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br i1 undef, label %loop1, label %loop2
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loop2:
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br i1 undef, label %loop1, label %exit
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exit:
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%phi2 = phi i32* [ %phi1, %loop2 ], [ null, %entry ]
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ret i32 undef
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}
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define i32 @PR13906() {
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; Another pattern which can lead to crashes due to failing to clear out dead
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; PHI nodes or select nodes. This triggers subtly differently from the above
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; cases because the PHI node is (recursively) alive, but the select is dead.
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; CHECK-LABEL: @PR13906(
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; CHECK-NOT: alloca
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entry:
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%c = alloca i32
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store i32 0, i32* %c
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br label %for.cond
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for.cond:
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%d.0 = phi i32* [ undef, %entry ], [ %c, %if.then ], [ %d.0, %for.cond ]
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br i1 undef, label %if.then, label %for.cond
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if.then:
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%tmpcast.d.0 = select i1 undef, i32* %c, i32* %d.0
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br label %for.cond
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}
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define i64 @PR14132(i1 %flag) {
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; CHECK-LABEL: @PR14132(
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; Here we form a PHI-node by promoting the pointer alloca first, and then in
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; order to promote the other two allocas, we speculate the load of the
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; now-phi-node-pointer. In doing so we end up loading a 64-bit value from an i8
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; alloca. While this is a bit dubious, we were asserting on trying to
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; rewrite it. The trick is that the code using the value may carefully take
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; steps to only use the not-undef bits, and so we need to at least loosely
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; support this..
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entry:
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%a = alloca i64
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%b = alloca i8
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%ptr = alloca i64*
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; CHECK-NOT: alloca
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%ptr.cast = bitcast i64** %ptr to i8**
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store i64 0, i64* %a
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store i8 1, i8* %b
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store i64* %a, i64** %ptr
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br i1 %flag, label %if.then, label %if.end
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if.then:
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store i8* %b, i8** %ptr.cast
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br label %if.end
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; CHECK-NOT: store
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; CHECK: %[[ext:.*]] = zext i8 1 to i64
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if.end:
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%tmp = load i64** %ptr
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%result = load i64* %tmp
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; CHECK-NOT: load
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; CHECK: %[[result:.*]] = phi i64 [ %[[ext]], %if.then ], [ 0, %entry ]
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ret i64 %result
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; CHECK-NEXT: ret i64 %[[result]]
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}
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define float @PR16687(i64 %x, i1 %flag) {
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; CHECK-LABEL: @PR16687(
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; Check that even when we try to speculate the same phi twice (in two slices)
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; on an otherwise promotable construct, we don't get ahead of ourselves and try
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; to promote one of the slices prior to speculating it.
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entry:
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%a = alloca i64, align 8
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store i64 %x, i64* %a
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br i1 %flag, label %then, label %else
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; CHECK-NOT: alloca
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; CHECK-NOT: store
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; CHECK: %[[lo:.*]] = trunc i64 %x to i32
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; CHECK: %[[shift:.*]] = lshr i64 %x, 32
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; CHECK: %[[hi:.*]] = trunc i64 %[[shift]] to i32
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then:
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%a.f = bitcast i64* %a to float*
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br label %end
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; CHECK: %[[lo_cast:.*]] = bitcast i32 %[[lo]] to float
|
|
|
|
else:
|
|
%a.raw = bitcast i64* %a to i8*
|
|
%a.raw.4 = getelementptr i8* %a.raw, i64 4
|
|
%a.raw.4.f = bitcast i8* %a.raw.4 to float*
|
|
br label %end
|
|
; CHECK: %[[hi_cast:.*]] = bitcast i32 %[[hi]] to float
|
|
|
|
end:
|
|
%a.phi.f = phi float* [ %a.f, %then ], [ %a.raw.4.f, %else ]
|
|
%f = load float* %a.phi.f
|
|
ret float %f
|
|
; CHECK: %[[phi:.*]] = phi float [ %[[lo_cast]], %then ], [ %[[hi_cast]], %else ]
|
|
; CHECK-NOT: load
|
|
; CHECK: ret float %[[phi]]
|
|
}
|