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