154 lines
4.2 KiB
LLVM
154 lines
4.2 KiB
LLVM
; RUN: opt < %s -passes=dse -S | FileCheck %s
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declare noalias ptr @calloc(i64, i64) inaccessiblememonly allockind("alloc,zeroed")
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define ptr @test1() {
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; CHECK-LABEL: test1
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%1 = tail call noalias ptr @calloc(i64 1, i64 4)
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; This store is dead and should be removed
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store i32 0, ptr %1, align 4
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; CHECK-NOT: store i32 0, ptr %1, align 4
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ret ptr %1
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}
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define ptr @test2() {
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; CHECK-LABEL: test2
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%1 = tail call noalias ptr @calloc(i64 1, i64 4)
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%2 = getelementptr i32, ptr %1, i32 5
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store i32 0, ptr %2, align 4
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; CHECK-NOT: store i32 0, ptr %1, align 4
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ret ptr %1
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}
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define ptr @test3(ptr %arg) {
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; CHECK-LABEL: test3
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store i32 0, ptr %arg, align 4
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; CHECK: store i32 0, ptr %arg, align 4
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ret ptr %arg
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}
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declare void @clobber_memory(ptr)
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define ptr @test4() {
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; CHECK-LABEL: test4
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%1 = tail call noalias ptr @calloc(i64 1, i64 4)
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call void @clobber_memory(ptr %1)
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store i8 0, ptr %1, align 4
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; CHECK: store i8 0, ptr %1, align 4
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ret ptr %1
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}
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define ptr @test5() {
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; CHECK-LABEL: test5
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%1 = tail call noalias ptr @calloc(i64 1, i64 4)
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store volatile i32 0, ptr %1, align 4
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; CHECK: store volatile i32 0, ptr %1, align 4
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ret ptr %1
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}
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define ptr @test6() {
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; CHECK-LABEL: test6
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%1 = tail call noalias ptr @calloc(i64 1, i64 4)
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store i8 5, ptr %1, align 4
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; CHECK: store i8 5, ptr %1, align 4
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ret ptr %1
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}
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define ptr @test7(i8 %arg) {
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; CHECK-LABEL: test7
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%1 = tail call noalias ptr @calloc(i64 1, i64 4)
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store i8 %arg, ptr %1, align 4
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; CHECK: store i8 %arg, ptr %1, align 4
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ret ptr %1
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}
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define ptr @test8() {
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; CHECK-LABEL: test8
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; CHECK-NOT: store
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%p = tail call noalias ptr @calloc(i64 1, i64 4)
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store i8 0, ptr %p, align 1
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%p.1 = getelementptr i8, ptr %p, i32 1
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store i8 0, ptr %p.1, align 1
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%p.3 = getelementptr i8, ptr %p, i32 3
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store i8 0, ptr %p.3, align 1
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%p.2 = getelementptr i8, ptr %p, i32 2
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store i8 0, ptr %p.2, align 1
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ret ptr %p
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}
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define ptr @test9() {
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; CHECK-LABEL: test9
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; CHECK-NEXT: %p = tail call noalias ptr @calloc(i64 1, i64 4)
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; CHECK-NEXT: store i8 5, ptr %p, align 1
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; CHECK-NEXT: ret ptr %p
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%p = tail call noalias ptr @calloc(i64 1, i64 4)
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store i8 5, ptr %p, align 1
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%p.1 = getelementptr i8, ptr %p, i32 1
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store i8 0, ptr %p.1, align 1
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%p.3 = getelementptr i8, ptr %p, i32 3
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store i8 0, ptr %p.3, align 1
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%p.2 = getelementptr i8, ptr %p, i32 2
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store i8 0, ptr %p.2, align 1
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ret ptr %p
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}
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define ptr @test10() {
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; CHECK-LABEL: @test10(
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; CHECK-NEXT: [[P:%.*]] = tail call noalias ptr @calloc(i64 1, i64 4)
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; CHECK-NEXT: [[P_3:%.*]] = getelementptr i8, ptr [[P]], i32 3
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; CHECK-NEXT: store i8 5, ptr [[P_3]], align 1
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; CHECK-NEXT: ret ptr [[P]]
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;
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%p = tail call noalias ptr @calloc(i64 1, i64 4)
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store i8 0, ptr %p, align 1
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%p.1 = getelementptr i8, ptr %p, i32 1
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store i8 0, ptr %p.1, align 1
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%p.3 = getelementptr i8, ptr %p, i32 3
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store i8 5, ptr %p.3, align 1
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%p.2 = getelementptr i8, ptr %p, i32 2
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store i8 0, ptr %p.2, align 1
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ret ptr %p
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}
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define ptr @test11() {
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; CHECK-LABEL: @test11(
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; CHECK-NEXT: [[P:%.*]] = tail call noalias ptr @calloc(i64 1, i64 4)
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; CHECK-NEXT: ret ptr [[P]]
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;
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%p = tail call noalias ptr @calloc(i64 1, i64 4)
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store i8 0, ptr %p, align 1
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%p.1 = getelementptr i8, ptr %p, i32 1
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store i8 0, ptr %p.1, align 1
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%p.3 = getelementptr i8, ptr %p, i32 3
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store i8 5, ptr %p.3, align 1
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%p.2 = getelementptr i8, ptr %p, i32 2
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store i8 0, ptr %p.2, align 1
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%p.3.2 = getelementptr i8, ptr %p, i32 3
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store i8 0, ptr %p.3.2, align 1
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ret ptr %p
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}
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define ptr @test12() {
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; CHECK-LABEL: @test12(
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; CHECK-NEXT: [[P:%.*]] = tail call noalias ptr @calloc(i64 1, i64 4)
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; CHECK-NEXT: [[P_3:%.*]] = getelementptr i8, ptr [[P]], i32 3
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; CHECK-NEXT: store i8 5, ptr [[P_3]], align 1
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; CHECK-NEXT: call void @use(ptr [[P]])
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; CHECK-NEXT: [[P_3_2:%.*]] = getelementptr i8, ptr [[P]], i32 3
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; CHECK-NEXT: store i8 0, ptr [[P_3_2]], align 1
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; CHECK-NEXT: ret ptr [[P]]
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;
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%p = tail call noalias ptr @calloc(i64 1, i64 4)
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%p.3 = getelementptr i8, ptr %p, i32 3
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store i8 5, ptr %p.3, align 1
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call void @use(ptr %p)
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%p.3.2 = getelementptr i8, ptr %p, i32 3
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store i8 0, ptr %p.3.2, align 1
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ret ptr %p
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}
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declare void @use(ptr) readonly
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