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Tweak x86-64 ABI to allow reuse for vararg handling. 

llvm-svn: 64221
This commit is contained in:
Daniel Dunbar 2009-02-10 17:06:09 +00:00
parent d1de45a146
commit 9403cd6d85
1 changed files with 26 additions and 22 deletions
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48
clang/lib/CodeGen/CGCall.cpp
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@ -394,8 +394,8 @@ class X86_64ABIInfo : public ABIInfo {
ABIArgInfo classifyArgumentType(QualType Ty,
ASTContext &Context,
unsigned &freeIntRegs,
unsigned &freeSSERegs) const;
unsigned &neededInt,
unsigned &neededSSE) const;
public:
virtual void computeInfo(CGFunctionInfo &FI, ASTContext &Context) const;
@ -700,8 +700,8 @@ ABIArgInfo X86_64ABIInfo::classifyReturnType(QualType RetTy,
}
ABIArgInfo X86_64ABIInfo::classifyArgumentType(QualType Ty, ASTContext &Context,
unsigned &freeIntRegs,
unsigned &freeSSERegs) const {
unsigned &neededInt,
unsigned &neededSSE) const {
X86_64ABIInfo::Class Lo, Hi;
classify(Ty, Context, 0, Lo, Hi);
@ -711,7 +711,8 @@ ABIArgInfo X86_64ABIInfo::classifyArgumentType(QualType Ty, ASTContext &Context,
assert((Lo != NoClass || Hi == NoClass) && "Invalid null classification.");
assert((Hi != SSEUp || Lo == SSE) && "Invalid SSEUp classification.");
unsigned neededInt = 0, neededSSE = 0;
neededInt = 0;
neededSSE = 0;
const llvm::Type *ResType = 0;
switch (Lo) {
case NoClass:
@ -781,21 +782,7 @@ ABIArgInfo X86_64ABIInfo::classifyArgumentType(QualType Ty, ASTContext &Context,
break;
}
// AMD64-ABI 3.2.3p3: If there are no registers available for any
// eightbyte of an argument, the whole argument is passed on the
// stack. If registers have already been assigned for some
// eightbytes of such an argument, the assignments get reverted.
if (freeIntRegs >= neededInt && freeSSERegs >= neededSSE) {
freeIntRegs -= neededInt;
freeSSERegs -= neededSSE;
return ABIArgInfo::getCoerce(ResType);
} else {
// Choose appropriate in memory type.
if (CodeGenFunction::hasAggregateLLVMType(Ty))
return ABIArgInfo::getIndirect(0);
else
return ABIArgInfo::getDirect();
}
return ABIArgInfo::getCoerce(ResType);
}
void X86_64ABIInfo::computeInfo(CGFunctionInfo &FI, ASTContext &Context) const {
@ -807,8 +794,25 @@ void X86_64ABIInfo::computeInfo(CGFunctionInfo &FI, ASTContext &Context) const {
// AMD64-ABI 3.2.3p3: Once arguments are classified, the registers
// get assigned (in left-to-right order) for passing as follows...
for (CGFunctionInfo::arg_iterator it = FI.arg_begin(), ie = FI.arg_end();
it != ie; ++it)
it->info = classifyArgumentType(it->type, Context, freeIntRegs, freeSSERegs);
it != ie; ++it) {
unsigned neededInt, neededSSE;
it->info = classifyArgumentType(it->type, Context, neededInt, neededSSE);
// AMD64-ABI 3.2.3p3: If there are no registers available for any
// eightbyte of an argument, the whole argument is passed on the
// stack. If registers have already been assigned for some
// eightbytes of such an argument, the assignments get reverted.
if (freeIntRegs >= neededInt && freeSSERegs >= neededSSE) {
freeIntRegs -= neededInt;
freeSSERegs -= neededSSE;
} else {
// Choose appropriate in memory type.
if (CodeGenFunction::hasAggregateLLVMType(it->type))
it->info = ABIArgInfo::getIndirect(0);
else
it->info = ABIArgInfo::getDirect();
}
}
}
ABIArgInfo DefaultABIInfo::classifyReturnType(QualType RetTy,