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Handle intrinsics in GlobalsModRef. Fixes pr12351.

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llvm-svn: 153604
This commit is contained in:
Rafael Espindola 2012-03-28 21:31:24 +00:00
parent 7623979dd6
commit 1b3dfa1ce2
2 changed files with 39 additions and 0 deletions
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6
lib/Analysis/IPA/GlobalsModRef.cpp
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@ -21,6 +21,7 @@
#include "llvm/Instructions.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Analysis/MemoryBuiltins.h"
@ -467,6 +468,11 @@ void GlobalsModRef::AnalyzeCallGraph(CallGraph &CG, Module &M) {
} else if (isMalloc(&cast<Instruction>(*II)) ||
isFreeCall(&cast<Instruction>(*II))) {
FunctionEffect |= ModRef;
} else if (IntrinsicInst *Intrinsic = dyn_cast<IntrinsicInst>(&*II)) {
// The callgraph doesn't include intrinsic calls.
Function *Callee = Intrinsic->getCalledFunction();
ModRefBehavior Behaviour = AliasAnalysis::getModRefBehavior(Callee);
FunctionEffect |= (Behaviour & ModRef);
}
if ((FunctionEffect & Mod) == 0)

33
test/Analysis/GlobalsModRef/pr12351.ll Normal file
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@ -0,0 +1,33 @@
; RUN: opt < %s -basicaa -globalsmodref-aa -gvn -S | FileCheck %s
declare void @llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i32, i1)
define void @foo(i8* %x, i8* %y) {
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %x, i8* %y, i32 1, i32 1, i1 false);
ret void
}
define void @bar(i8* %y, i8* %z) {
%x = alloca i8
call void @foo(i8* %x, i8* %y)
%t = load i8* %x
store i8 %t, i8* %y
; CHECK: store i8 %t, i8* %y
ret void
}
define i32 @foo2() {
%foo = alloca i32
call void @bar2(i32* %foo)
%t0 = load i32* %foo, align 4
; CHECK: %t0 = load i32* %foo, align 4
ret i32 %t0
}
define void @bar2(i32* %foo) {
store i32 0, i32* %foo, align 4
tail call void @llvm.dbg.value(metadata !{}, i64 0, metadata !{})
ret void
}
declare void @llvm.dbg.value(metadata, i64, metadata) nounwind readnone