llvm/test/Transforms/GVN/2009-11-12-MemDepMallocBitCast.ll
Victor Hernandez 5c78736f85 Memory dependence analysis was incorrectly stopping to scan for stores to a pointer at bitcast uses of a malloc call.
It should continue scanning until the malloc call, and this patch fixes that.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83931 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-13 01:42:53 +00:00

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591 B
LLVM

; Test to make sure malloc's bitcast does not block detection of a store
; to aliased memory; GVN should not optimize away the load in this program.
; RUN: opt < %s -gvn -S | FileCheck %s
define i64 @test() {
%1 = tail call i8* @malloc(i64 mul (i64 4, i64 ptrtoint (i64* getelementptr (i64* null, i64 1) to i64))) ; <i8*> [#uses=2]
store i8 42, i8* %1
%X = bitcast i8* %1 to i64* ; <i64*> [#uses=1]
%Y = load i64* %X ; <i64> [#uses=1]
ret i64 %Y
; CHECK: %Y = load i64* %X
; CHECK: ret i64 %Y
}
declare noalias i8* @malloc(i64)