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Don't assume a tail call can't reference a byval

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argument to the outer function, this isn't correct.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49731 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen
2008-04-15 17:41:34 +00:00
parent b11af0db2e
commit 21d31a8d94
2 changed files with 22 additions and 2 deletions
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lib/Analysis/BasicAliasAnalysis.cpp
+4 -2
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@@ -273,8 +273,10 @@ BasicAliasAnalysis::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
// If this is a tail call and P points to a stack location, we know that
// the tail call cannot access or modify the local stack.
if (isa<AllocaInst>(Object) ||
(isa<Argument>(Object) && cast<Argument>(Object)->hasByValAttr()))
// We cannot exclude byval arguments here; these belong to the caller of
// the current function not to the current function, and a tail callee
// may reference them.
if (isa<AllocaInst>(Object))
if (CallInst *CI = dyn_cast<CallInst>(CS.getInstruction()))
if (CI->isTailCall())
return NoModRef;