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Allow inlining of functions with returns_twice calls, if they have the

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attribute themselve.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146851 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Joerg Sonnenberger
2011-12-18 20:35:43 +00:00
parent 2ea4cdb81f
commit 3470693641
6 changed files with 70 additions and 22 deletions
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14
lib/Analysis/InlineCost.cpp
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@ -232,10 +232,12 @@ unsigned CodeMetrics::CountCodeReductionForAlloca(Value *V) {
/// from the specified function.
void CodeMetrics::analyzeFunction(Function *F, const TargetData *TD) {
// If this function contains a call that "returns twice" (e.g., setjmp or
// _setjmp), never inline it. This is a hack because we depend on the user
// marking their local variables as volatile if they are live across a setjmp
// call, and they probably won't do this in callers.
callsSetJmp = F->callsFunctionThatReturnsTwice();
// _setjmp) and it isn't marked with "returns twice" itself, never inline it.
// This is a hack because we depend on the user marking their local variables
// as volatile if they are live across a setjmp call, and they probably
// won't do this in callers.
exposesReturnsTwice = F->callsFunctionThatReturnsTwice() &&
!F->hasFnAttr(Attribute::ReturnsTwice);
// Look at the size of the callee.
for (Function::const_iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
@ -265,7 +267,7 @@ void InlineCostAnalyzer::FunctionInfo::analyzeFunction(Function *F,
/// NeverInline - returns true if the function should never be inlined into
/// any caller
bool InlineCostAnalyzer::FunctionInfo::NeverInline() {
return (Metrics.callsSetJmp || Metrics.isRecursive ||
return (Metrics.exposesReturnsTwice || Metrics.isRecursive ||
Metrics.containsIndirectBr);
}
// getSpecializationBonus - The heuristic used to determine the per-call
@ -634,7 +636,7 @@ InlineCostAnalyzer::growCachedCostInfo(Function *Caller, Function *Callee) {
// FIXME: If any of these three are true for the callee, the callee was
// not inlined into the caller, so I think they're redundant here.
CallerMetrics.callsSetJmp |= CalleeMetrics.callsSetJmp;
CallerMetrics.exposesReturnsTwice |= CalleeMetrics.exposesReturnsTwice;
CallerMetrics.isRecursive |= CalleeMetrics.isRecursive;
CallerMetrics.containsIndirectBr |= CalleeMetrics.containsIndirectBr;