74 lines
2.3 KiB
LLVM
74 lines
2.3 KiB
LLVM
; Makes sure that we give up on some pathological cases with inttoptr/ptrtoint
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;
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; @ptr_test was generated from the following C code:
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; void ptr_test() {
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; int* A;
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; unsigned long RefCopy = 0;
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; for (int i = 0; i < 8*sizeof(&A); ++i) {
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; if ((unsigned long)&A & (1UL << i))
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; RefCopy |= 1UL << i;
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; }
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;
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; int** AliasA1 = (int**)RefCopy;
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; int* ShouldAliasA = *AliasA1;
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; }
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; RUN: opt < %s -disable-basicaa -cfl-steens-aa -aa-eval -print-may-aliases -disable-output 2>&1 | FileCheck %s
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; CHECK: Function: ptr_test
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define void @ptr_test() #0 {
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; CHECK: MayAlias: i32** %A, i32** %ShouldAliasA
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; CHECK-NOT: %AliasA1
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entry:
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%A = alloca i32*, align 8
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%RefCopy = alloca i64, align 8
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%i = alloca i32, align 4
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%AliasA1 = alloca i32**, align 8
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%ShouldAliasA = alloca i32*, align 8
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store i64 0, i64* %RefCopy, align 8
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store i32 0, i32* %i, align 4
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%0 = load i32, i32* %i, align 4
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%conv = sext i32 %0 to i64
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%cmp = icmp ult i64 %conv, 64
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br i1 %cmp, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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%1 = ptrtoint i32** %A to i64
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%2 = load i32, i32* %i, align 4
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%sh_prom = zext i32 %2 to i64
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%shl = shl i64 1, %sh_prom
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%and = and i64 %1, %shl
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%tobool = icmp ne i64 %and, 0
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br i1 %tobool, label %if.then, label %if.end
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if.then: ; preds = %for.body
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%3 = load i32, i32* %i, align 4
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%sh_prom2 = zext i32 %3 to i64
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%shl3 = shl i64 1, %sh_prom2
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%4 = load i64, i64* %RefCopy, align 8
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%or = or i64 %4, %shl3
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store i64 %or, i64* %RefCopy, align 8
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br label %if.end
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if.end: ; preds = %if.then, %for.body
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br label %for.inc
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for.inc: ; preds = %if.end
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%5 = load i32, i32* %i, align 4
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%inc = add nsw i32 %5, 1
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store i32 %inc, i32* %i, align 4
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br label %for.cond
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for.end: ; preds = %for.cond
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%6 = load i64, i64* %RefCopy, align 8
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%7 = inttoptr i64 %6 to i32**
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store i32** %7, i32*** %AliasA1, align 8
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%8 = load i32**, i32*** %AliasA1, align 8
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%9 = load i32*, i32** %8, align 8
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store i32* %9, i32** %ShouldAliasA, align 8
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ret void
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}
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