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Remove any 'nest' parameter attributes if the function

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is not passed as an argument to a trampoline intrinsic.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47220 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2008-02-16 20:56:04 +00:00
parent b3a94608b3
commit 3d5378ff8e
2 changed files with 109 additions and 10 deletions
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62
lib/Transforms/IPO/GlobalOpt.cpp
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@@ -21,6 +21,7 @@
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Module.h"
#include "llvm/ParameterAttributes.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Target/TargetData.h"
@@ -46,6 +47,7 @@ STATISTIC(NumLocalized , "Number of globals localized");
STATISTIC(NumShrunkToBool , "Number of global vars shrunk to booleans");
STATISTIC(NumFastCallFns , "Number of functions converted to fastcc");
STATISTIC(NumCtorsEvaluated, "Number of static ctors evaluated");
STATISTIC(NumNestRemoved , "Number of nest attributes removed");
namespace {
struct VISIBILITY_HIDDEN GlobalOpt : public ModulePass {
@@ -1590,6 +1592,35 @@ static void ChangeCalleesToFastCall(Function *F) {
}
}
static const ParamAttrsList *StripNest(const ParamAttrsList *Attrs) {
if (Attrs) {
for (unsigned i = 0, e = Attrs->size(); i != e; ++i) {
uint16_t A = Attrs->getParamAttrsAtIndex(i);
if (A & ParamAttr::Nest) {
Attrs = ParamAttrsList::excludeAttrs(Attrs, Attrs->getParamIndex(i),
ParamAttr::Nest);
// There can be only one.
break;
}
}
}
return Attrs;
}
static void RemoveNestAttribute(Function *F) {
F->setParamAttrs(StripNest(F->getParamAttrs()));
for (Value::use_iterator UI = F->use_begin(), E = F->use_end(); UI != E;++UI){
Instruction *User = cast<Instruction>(*UI);
if (CallInst *CI = dyn_cast<CallInst>(User)) {
CI->setParamAttrs(StripNest(CI->getParamAttrs()));
} else {
InvokeInst *II = cast<InvokeInst>(User);
II->setParamAttrs(StripNest(II->getParamAttrs()));
}
}
}
bool GlobalOpt::OptimizeFunctions(Module &M) {
bool Changed = false;
// Optimize functions.
@@ -1601,16 +1632,27 @@ bool GlobalOpt::OptimizeFunctions(Module &M) {
M.getFunctionList().erase(F);
Changed = true;
++NumFnDeleted;
} else if (F->hasInternalLinkage() &&
F->getCallingConv() == CallingConv::C && !F->isVarArg() &&
OnlyCalledDirectly(F)) {
// If this function has C calling conventions, is not a varargs
// function, and is only called directly, promote it to use the Fast
// calling convention.
F->setCallingConv(CallingConv::Fast);
ChangeCalleesToFastCall(F);
++NumFastCallFns;
Changed = true;
} else if (F->hasInternalLinkage()) {
if (F->getCallingConv() == CallingConv::C && !F->isVarArg() &&
OnlyCalledDirectly(F)) {
// If this function has C calling conventions, is not a varargs
// function, and is only called directly, promote it to use the Fast
// calling convention.
F->setCallingConv(CallingConv::Fast);
ChangeCalleesToFastCall(F);
++NumFastCallFns;
Changed = true;
}
if (F->getParamAttrs() &&
F->getParamAttrs()->hasAttrSomewhere(ParamAttr::Nest) &&
OnlyCalledDirectly(F)) {
// The function is not used by a trampoline intrinsic, so it is safe
// to remove the 'nest' attribute.
RemoveNestAttribute(F);
++NumNestRemoved;
Changed = true;
}
}
}
return Changed;