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97 lines
2.6 KiB
LLVM
97 lines
2.6 KiB
LLVM
; RUN: opt -S -early-cse < %s | FileCheck %s
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; RUN: opt -S -basicaa -early-cse-memssa < %s | FileCheck %s
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declare void @clobber_and_use(i32)
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define void @f_0(i32* %ptr) {
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; CHECK-LABEL: @f_0(
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; CHECK: %val0 = load i32, i32* %ptr, !invariant.load !0
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; CHECK: call void @clobber_and_use(i32 %val0)
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; CHECK: call void @clobber_and_use(i32 %val0)
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; CHECK: call void @clobber_and_use(i32 %val0)
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; CHECK: ret void
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%val0 = load i32, i32* %ptr, !invariant.load !{}
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call void @clobber_and_use(i32 %val0)
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%val1 = load i32, i32* %ptr, !invariant.load !{}
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call void @clobber_and_use(i32 %val1)
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%val2 = load i32, i32* %ptr, !invariant.load !{}
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call void @clobber_and_use(i32 %val2)
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ret void
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}
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define void @f_1(i32* %ptr) {
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; We can forward invariant loads to non-invariant loads.
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; CHECK-LABEL: @f_1(
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; CHECK: %val0 = load i32, i32* %ptr, !invariant.load !0
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; CHECK: call void @clobber_and_use(i32 %val0)
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; CHECK: call void @clobber_and_use(i32 %val0)
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%val0 = load i32, i32* %ptr, !invariant.load !{}
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call void @clobber_and_use(i32 %val0)
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%val1 = load i32, i32* %ptr
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call void @clobber_and_use(i32 %val1)
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ret void
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}
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define void @f_2(i32* %ptr) {
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; We can forward a non-invariant load into an invariant load.
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; CHECK-LABEL: @f_2(
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; CHECK: %val0 = load i32, i32* %ptr
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; CHECK: call void @clobber_and_use(i32 %val0)
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; CHECK: call void @clobber_and_use(i32 %val0)
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%val0 = load i32, i32* %ptr
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call void @clobber_and_use(i32 %val0)
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%val1 = load i32, i32* %ptr, !invariant.load !{}
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call void @clobber_and_use(i32 %val1)
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ret void
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}
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define void @f_3(i1 %cond, i32* %ptr) {
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; CHECK-LABEL: @f_3(
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%val0 = load i32, i32* %ptr, !invariant.load !{}
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call void @clobber_and_use(i32 %val0)
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br i1 %cond, label %left, label %right
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; CHECK: %val0 = load i32, i32* %ptr, !invariant.load !0
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; CHECK: left:
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; CHECK-NEXT: call void @clobber_and_use(i32 %val0)
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left:
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%val1 = load i32, i32* %ptr
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call void @clobber_and_use(i32 %val1)
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ret void
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right:
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ret void
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}
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define void @f_4(i1 %cond, i32* %ptr) {
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; Negative test -- can't forward %val0 to %va1 because that'll break
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; def-dominates-use.
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; CHECK-LABEL: @f_4(
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br i1 %cond, label %left, label %merge
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left:
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; CHECK: left:
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; CHECK-NEXT: %val0 = load i32, i32* %ptr, !invariant.load !
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; CHECK-NEXT: call void @clobber_and_use(i32 %val0)
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%val0 = load i32, i32* %ptr, !invariant.load !{}
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call void @clobber_and_use(i32 %val0)
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br label %merge
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merge:
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; CHECK: merge:
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; CHECK-NEXT: %val1 = load i32, i32* %ptr
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; CHECK-NEXT: call void @clobber_and_use(i32 %val1)
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%val1 = load i32, i32* %ptr
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call void @clobber_and_use(i32 %val1)
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ret void
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}
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