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Don't insert lifetime.end markers between a musttail call and ret

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The allocas going out of scope are immediately killed by the return
instruction.

This is a resend of r208912, which was committed accidentally.

Reviewers: chandlerc

Differential Revision: http://reviews.llvm.org/D3792

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208920 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner
2014-05-15 21:10:46 +00:00
parent cf7cfd8208
commit 48ea98d1d2
2 changed files with 48 additions and 2 deletions
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14
lib/Transforms/Utils/InlineFunction.cpp
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@ -755,8 +755,13 @@ bool llvm::InlineFunction(CallSite CS, InlineFunctionInfo &IFI,
}
builder.CreateLifetimeStart(AI, AllocaSize);
for (ReturnInst *RI : Returns)
for (ReturnInst *RI : Returns) {
// Don't insert llvm.lifetime.end calls between a musttail call and a
// return. The return kills all local allocas.
if (InlinedMustTailCalls && getPrecedingMustTailCall(RI))
continue;
IRBuilder<>(RI).CreateLifetimeEnd(AI, AllocaSize);
}
}
}
@ -774,8 +779,13 @@ bool llvm::InlineFunction(CallSite CS, InlineFunctionInfo &IFI,
// Insert a call to llvm.stackrestore before any return instructions in the
// inlined function.
for (ReturnInst *RI : Returns)
for (ReturnInst *RI : Returns) {
// Don't insert llvm.stackrestore calls between a musttail call and a
// return. The return will restore the stack pointer.
if (InlinedMustTailCalls && getPrecedingMustTailCall(RI))
continue;
IRBuilder<>(RI).CreateCall(StackRestore, SavedPtr);
}
}
// If we are inlining for an invoke instruction, we must make sure to rewrite