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b501eafd98
Pointers escape when converted to integers, so a pointer produced by converting an integer to a pointer must not be a local non-escaping object. Reviewed By: nikic, nlopes, aqjune Differential Revision: https://reviews.llvm.org/D101541
61 lines
1.5 KiB
LLVM
61 lines
1.5 KiB
LLVM
; RUN: opt < %s -basic-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
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target datalayout = "p:64:64"
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declare void @escape(i8* %ptr)
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; Verify that unescaped noalias parameter does not alias inttoptr
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define void @test1(i8* noalias %P, i64 %Q_as_int) {
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; CHECK-LABEL: Function: test1:
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; CHECK: NoAlias: i8* %P, i8* %Q
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%Q = inttoptr i64 %Q_as_int to i8*
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store i8 0, i8* %P
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store i8 1, i8* %Q
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ret void
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}
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; Verify that unescaped alloca does not alias inttoptr
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define void @test2(i64 %Q_as_int) {
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; CHECK-LABEL: Function: test2:
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; CHECK: NoAlias: i8* %P, i8* %Q
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%P = alloca i8
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%Q = inttoptr i64 %Q_as_int to i8*
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store i8 0, i8* %P
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store i8 1, i8* %Q
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ret void
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}
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; Verify that escaped noalias parameter may alias inttoptr
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define void @test3(i8* noalias %P, i64 %Q_as_int) {
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; CHECK-LABEL: Function: test3:
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; CHECK: MayAlias: i8* %P, i8* %Q
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call void @escape(i8* %P)
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%Q = inttoptr i64 %Q_as_int to i8*
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store i8 0, i8* %P
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store i8 1, i8* %Q
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ret void
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}
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; Verify that escaped alloca may alias inttoptr
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define void @test4(i64 %Q_as_int) {
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; CHECK-LABEL: Function: test4:
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; CHECK: MayAlias: i8* %P, i8* %Q
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%P = alloca i8
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call void @escape(i8* %P)
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%Q = inttoptr i64 %Q_as_int to i8*
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store i8 0, i8* %P
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store i8 1, i8* %Q
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ret void
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}
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; Verify that global may alias inttoptr
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@G = external global i8
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define void @test5(i64 %Q_as_int) {
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; CHECK-LABEL: Function: test5:
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; CHECK: MayAlias: i8* %Q, i8* @G
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%Q = inttoptr i64 %Q_as_int to i8*
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store i8 0, i8* @G
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store i8 1, i8* %Q
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ret void
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}
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