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The function that does nothing but call malloc is noalias return.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62956 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2009-01-25 07:59:57 +00:00
parent 1902a129a5
commit 9d4979123e
2 changed files with 17 additions and 5 deletions
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11
lib/Transforms/IPO/IndMemRemoval.cpp
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@ -44,11 +44,11 @@ static RegisterPass<IndMemRemPass>
X("indmemrem","Indirect Malloc and Free Removal");
bool IndMemRemPass::runOnModule(Module &M) {
//in Theory, all direct calls of malloc and free should be promoted
//to intrinsics. Therefor, this goes through and finds where the
//address of free or malloc are taken and replaces those with bounce
//functions, ensuring that all malloc and free that might happen
//happen through intrinsics.
// In theory, all direct calls of malloc and free should be promoted
// to intrinsics. Therefore, this goes through and finds where the
// address of free or malloc are taken and replaces those with bounce
// functions, ensuring that all malloc and free that might happen
// happen through intrinsics.
bool changed = false;
if (Function* F = M.getFunction("free")) {
if (F->isDeclaration() && F->arg_size() == 1 && !F->use_empty()) {
@ -69,6 +69,7 @@ bool IndMemRemPass::runOnModule(Module &M) {
Function* FN = Function::Create(F->getFunctionType(),
GlobalValue::LinkOnceLinkage,
"malloc_llvm_bounce", &M);
FN->setDoesNotAlias(0);
BasicBlock* bb = BasicBlock::Create("entry",FN);
Instruction* c = CastInst::CreateIntegerCast(
FN->arg_begin(), Type::Int32Ty, false, "c", bb);

11
test/Transforms/IndMemRem/2009-01-24-Noalias.ll Normal file
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@ -0,0 +1,11 @@
; RUN: llvm-as < %s | opt -indmemrem | llvm-dis | grep bounce | grep noalias
declare i8* @malloc(i32)
@g = external global i8*
define void @test() {
%A = bitcast i8* (i32) * @malloc to i8*
store i8* %A, i8** @g
ret void
}