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x86_64 ABI: Support va_arg passed in mixed registers. 

- Now at 1274 passes on gcc compat suite vs 1262.

llvm-svn: 64469
This commit is contained in:
Daniel Dunbar 2009-02-13 17:46:31 +00:00
parent 55ea72179c
commit abe6ef932f
1 changed files with 22 additions and 1 deletions
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23
clang/lib/CodeGen/CGCall.cpp
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@ -963,7 +963,28 @@ llvm::Value *X86_64ABIInfo::EmitVAArg(llvm::Value *VAListAddr, QualType Ty,
CGF.Builder.CreateLoad(CGF.Builder.CreateStructGEP(VAListAddr, 3),
"reg_save_area");
if (neededInt && neededSSE) {
assert(0 && "FIXME: Implement support for va_arg in mixed regs");
// FIXME: Cleanup.
assert(AI.isCoerce() && "Unexpected ABI info for mixed regs");
const llvm::StructType *ST = cast<llvm::StructType>(AI.getCoerceToType());
llvm::Value *Tmp = CGF.CreateTempAlloca(ST);
assert(ST->getNumElements() == 2 && "Unexpected ABI info for mixed regs");
const llvm::Type *TyLo = ST->getElementType(0);
const llvm::Type *TyHi = ST->getElementType(1);
assert((TyLo->isFloatingPoint() ^ TyHi->isFloatingPoint()) &&
"Unexpected ABI info for mixed regs");
const llvm::Type *PTyLo = llvm::PointerType::getUnqual(TyLo);
const llvm::Type *PTyHi = llvm::PointerType::getUnqual(TyHi);
llvm::Value *GPAddr = CGF.Builder.CreateGEP(RegAddr, gp_offset);
llvm::Value *FPAddr = CGF.Builder.CreateGEP(RegAddr, fp_offset);
llvm::Value *RegLoAddr = TyLo->isFloatingPoint() ? FPAddr : GPAddr;
llvm::Value *RegHiAddr = TyLo->isFloatingPoint() ? GPAddr : FPAddr;
llvm::Value *V =
CGF.Builder.CreateLoad(CGF.Builder.CreateBitCast(RegLoAddr, PTyLo));
CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 0));
V = CGF.Builder.CreateLoad(CGF.Builder.CreateBitCast(RegHiAddr, PTyHi));
CGF.Builder.CreateStore(V, CGF.Builder.CreateStructGEP(Tmp, 1));
RegAddr = CGF.Builder.CreateBitCast(Tmp, llvm::PointerType::getUnqual(LTy));
} else if (neededInt) {
RegAddr = CGF.Builder.CreateGEP(RegAddr, gp_offset);
RegAddr = CGF.Builder.CreateBitCast(RegAddr,