forked from OSchip/llvm-project
260 lines
7.3 KiB
LLVM
260 lines
7.3 KiB
LLVM
; RUN: opt < %s -S -early-cse | FileCheck %s
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; CHECK-LABEL: @test12(
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define i32 @test12(i1 %B, i32* %P1, i32* %P2) {
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%load0 = load i32, i32* %P1
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%1 = load atomic i32, i32* %P2 seq_cst, align 4
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%load1 = load i32, i32* %P1
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%sel = select i1 %B, i32 %load0, i32 %load1
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ret i32 %sel
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; CHECK: load i32, i32* %P1
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; CHECK: load i32, i32* %P1
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}
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; CHECK-LABEL: @test13(
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; atomic to non-atomic forwarding is legal
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define i32 @test13(i1 %B, i32* %P1) {
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%a = load atomic i32, i32* %P1 seq_cst, align 4
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%b = load i32, i32* %P1
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%res = sub i32 %a, %b
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ret i32 %res
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; CHECK: load atomic i32, i32* %P1
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; CHECK: ret i32 0
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}
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; CHECK-LABEL: @test14(
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; atomic to unordered atomic forwarding is legal
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define i32 @test14(i1 %B, i32* %P1) {
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%a = load atomic i32, i32* %P1 seq_cst, align 4
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%b = load atomic i32, i32* %P1 unordered, align 4
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%res = sub i32 %a, %b
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ret i32 %res
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; CHECK: load atomic i32, i32* %P1 seq_cst
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; CHECK-NEXT: ret i32 0
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}
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; CHECK-LABEL: @test15(
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; implementation restriction: can't forward to stonger
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; than unordered
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define i32 @test15(i1 %B, i32* %P1, i32* %P2) {
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%a = load atomic i32, i32* %P1 seq_cst, align 4
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%b = load atomic i32, i32* %P1 seq_cst, align 4
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%res = sub i32 %a, %b
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ret i32 %res
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; CHECK: load atomic i32, i32* %P1
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; CHECK: load atomic i32, i32* %P1
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}
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; CHECK-LABEL: @test16(
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; forwarding non-atomic to atomic is wrong! (However,
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; it would be legal to use the later value in place of the
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; former in this particular example. We just don't
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; do that right now.)
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define i32 @test16(i1 %B, i32* %P1, i32* %P2) {
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%a = load i32, i32* %P1, align 4
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%b = load atomic i32, i32* %P1 unordered, align 4
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%res = sub i32 %a, %b
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ret i32 %res
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; CHECK: load i32, i32* %P1
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; CHECK: load atomic i32, i32* %P1
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}
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; Can't DSE across a full fence
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define void @fence_seq_cst_store(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @fence_seq_cst_store
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; CHECK: store
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; CHECK: store atomic
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; CHECK: store
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store i32 0, i32* %P1, align 4
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store atomic i32 0, i32* %P2 seq_cst, align 4
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store i32 0, i32* %P1, align 4
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ret void
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}
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; Can't DSE across a full fence
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define void @fence_seq_cst(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @fence_seq_cst
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; CHECK: store
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; CHECK: fence seq_cst
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; CHECK: store
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store i32 0, i32* %P1, align 4
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fence seq_cst
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store i32 0, i32* %P1, align 4
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ret void
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}
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; Can't DSE across a full fence
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define void @fence_asm_sideeffect(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @fence_asm_sideeffect
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; CHECK: store
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; CHECK: call void asm sideeffect
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; CHECK: store
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store i32 0, i32* %P1, align 4
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call void asm sideeffect "", ""()
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store i32 0, i32* %P1, align 4
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ret void
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}
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; Can't DSE across a full fence
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define void @fence_asm_memory(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @fence_asm_memory
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; CHECK: store
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; CHECK: call void asm
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; CHECK: store
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store i32 0, i32* %P1, align 4
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call void asm "", "~{memory}"()
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store i32 0, i32* %P1, align 4
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ret void
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}
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; Can't remove a volatile load
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define i32 @volatile_load(i1 %B, i32* %P1, i32* %P2) {
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%a = load i32, i32* %P1, align 4
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%b = load volatile i32, i32* %P1, align 4
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%res = sub i32 %a, %b
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ret i32 %res
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; CHECK-LABEL: @volatile_load
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; CHECK: load i32, i32* %P1
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; CHECK: load volatile i32, i32* %P1
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}
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; Can't remove redundant volatile loads
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define i32 @redundant_volatile_load(i1 %B, i32* %P1, i32* %P2) {
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%a = load volatile i32, i32* %P1, align 4
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%b = load volatile i32, i32* %P1, align 4
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%res = sub i32 %a, %b
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ret i32 %res
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; CHECK-LABEL: @redundant_volatile_load
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; CHECK: load volatile i32, i32* %P1
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; CHECK: load volatile i32, i32* %P1
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; CHECK: sub
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}
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; Can't DSE a volatile store
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define void @volatile_store(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @volatile_store
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; CHECK: store volatile
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; CHECK: store
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store volatile i32 0, i32* %P1, align 4
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store i32 3, i32* %P1, align 4
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ret void
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}
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; Can't DSE a redundant volatile store
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define void @redundant_volatile_store(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @redundant_volatile_store
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; CHECK: store volatile
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; CHECK: store volatile
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store volatile i32 0, i32* %P1, align 4
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store volatile i32 0, i32* %P1, align 4
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ret void
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}
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; Can value forward from volatiles
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define i32 @test20(i1 %B, i32* %P1, i32* %P2) {
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%a = load volatile i32, i32* %P1, align 4
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%b = load i32, i32* %P1, align 4
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%res = sub i32 %a, %b
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ret i32 %res
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; CHECK-LABEL: @test20
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; CHECK: load volatile i32, i32* %P1
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; CHECK: ret i32 0
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}
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; Can DSE a non-volatile store in favor of a volatile one
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; currently a missed optimization
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define void @test21(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @test21
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; CHECK: store
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; CHECK: store volatile
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store i32 0, i32* %P1, align 4
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store volatile i32 3, i32* %P1, align 4
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ret void
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}
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; Can DSE a normal store in favor of a unordered one
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define void @test22(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @test22
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; CHECK-NEXT: store atomic
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store i32 0, i32* %P1, align 4
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store atomic i32 3, i32* %P1 unordered, align 4
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ret void
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}
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; Can also DSE a unordered store in favor of a normal one
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define void @test23(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @test23
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; CHECK-NEXT: store i32 0
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store atomic i32 3, i32* %P1 unordered, align 4
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store i32 0, i32* %P1, align 4
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ret void
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}
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; As an implementation limitation, can't remove ordered stores
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; Note that we could remove the earlier store if we could
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; represent the required ordering.
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define void @test24(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @test24
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; CHECK-NEXT: store atomic
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; CHECK-NEXT: store i32 0
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store atomic i32 3, i32* %P1 release, align 4
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store i32 0, i32* %P1, align 4
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ret void
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}
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; Can't remove volatile stores - each is independently observable and
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; the count of such stores is an observable program side effect.
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define void @test25(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @test25
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; CHECK-NEXT: store volatile
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; CHECK-NEXT: store volatile
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store volatile i32 3, i32* %P1, align 4
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store volatile i32 0, i32* %P1, align 4
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ret void
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}
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; Can DSE a unordered store in favor of a unordered one
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define void @test26(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @test26
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; CHECK-NEXT: store atomic i32 3, i32* %P1 unordered, align 4
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; CHECK-NEXT: ret
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store atomic i32 0, i32* %P1 unordered, align 4
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store atomic i32 3, i32* %P1 unordered, align 4
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ret void
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}
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; Can DSE a unordered store in favor of a ordered one,
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; but current don't due to implementation limits
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define void @test27(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @test27
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; CHECK-NEXT: store atomic i32 0, i32* %P1 unordered, align 4
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; CHECK-NEXT: store atomic i32 3, i32* %P1 release, align 4
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; CHECK-NEXT: ret
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store atomic i32 0, i32* %P1 unordered, align 4
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store atomic i32 3, i32* %P1 release, align 4
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ret void
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}
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; Can DSE an unordered atomic store in favor of an
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; ordered one, but current don't due to implementation limits
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define void @test28(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @test28
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; CHECK-NEXT: store atomic i32 0, i32* %P1 unordered, align 4
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; CHECK-NEXT: store atomic i32 3, i32* %P1 release, align 4
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; CHECK-NEXT: ret
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store atomic i32 0, i32* %P1 unordered, align 4
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store atomic i32 3, i32* %P1 release, align 4
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ret void
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}
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; As an implementation limitation, can't remove ordered stores
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; see also: @test24
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define void @test29(i1 %B, i32* %P1, i32* %P2) {
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; CHECK-LABEL: @test29
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; CHECK-NEXT: store atomic
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; CHECK-NEXT: store atomic
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store atomic i32 3, i32* %P1 release, align 4
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store atomic i32 0, i32* %P1 unordered, align 4
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ret void
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}
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