forked from OSchip/llvm-project
57 lines
2.0 KiB
LLVM
57 lines
2.0 KiB
LLVM
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; RUN: opt -basic-aa -aa-eval -print-all-alias-modref-info -disable-output %s 2>&1 | FileCheck %s
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target datalayout = "p:32:32:32"
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; Test cases with i64 bit GEP indices that will get truncated implicitly to 32
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; bit due to the datalayout.
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declare void @llvm.assume(i1)
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define void @mustalias_overflow_in_32_bit_constants(i8* %ptr) {
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; CHECK-LABEL: Function: mustalias_overflow_in_32_bit_constants: 3 pointers, 0 call sites
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; CHECK-NEXT: MustAlias: i8* %gep.1, i8* %ptr
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; CHECK-NEXT: MustAlias: i8* %gep.2, i8* %ptr
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; CHECK-NEXT: MustAlias: i8* %gep.1, i8* %gep.2
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;
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%gep.1 = getelementptr i8, i8* %ptr, i64 4294967296
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store i8 0, i8* %gep.1
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%gep.2 = getelementptr i8, i8* %ptr, i64 0
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store i8 1, i8* %gep.2
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ret void
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}
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define void @noalias_overflow_in_32_bit_constants(i8* %ptr) {
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; CHECK-LABEL: Function: noalias_overflow_in_32_bit_constants: 3 pointers, 0 call sites
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; CHECK-NEXT: MustAlias: i8* %gep.1, i8* %ptr
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; CHECK-NEXT: NoAlias: i8* %gep.2, i8* %ptr
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; CHECK-NEXT: NoAlias: i8* %gep.1, i8* %gep.2
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;
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%gep.1 = getelementptr i8, i8* %ptr, i64 4294967296
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store i8 0, i8* %gep.1
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%gep.2 = getelementptr i8, i8* %ptr, i64 1
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store i8 1, i8* %gep.2
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ret void
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}
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; FIXME: Currently we incorrectly determine NoAlias for %gep.1 and %gep.2. The
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; GEP indices get implicitly truncated to 32 bit, so multiples of 2^32
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; (=4294967296) will be 0.
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; See https://alive2.llvm.org/ce/z/HHjQgb.
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define void @mustalias_overflow_in_32_bit_add_mul_gep(i8* %ptr, i64 %i) {
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; CHECK-LABEL: Function: mustalias_overflow_in_32_bit_add_mul_gep: 3 pointers, 1 call sites
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; CHECK-NEXT: NoAlias: i8* %gep.1, i8* %ptr
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; CHECK-NEXT: NoAlias: i8* %gep.2, i8* %ptr
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; CHECK-NEXT: NoAlias: i8* %gep.1, i8* %gep.2
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;
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%s.1 = icmp sgt i64 %i, 0
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call void @llvm.assume(i1 %s.1)
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%mul = mul nuw nsw i64 %i, 4294967296
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%add = add nuw nsw i64 %mul, %i
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%gep.1 = getelementptr i8, i8* %ptr, i64 %add
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store i8 0, i8* %gep.1
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%gep.2 = getelementptr i8, i8* %ptr, i64 %i
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store i8 1, i8* %gep.2
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ret void
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}
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