66 lines
1.6 KiB
LLVM
66 lines
1.6 KiB
LLVM
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; RUN: opt < %s -basic-aa -dse -enable-dse-memoryssa=false -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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