x86_64 ABI: Support va_arg passed in mixed registers.
- Now at 1274 passes on gcc compat suite vs 1262.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64469 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGCall.cpp b/lib/CodeGen/CGCall.cpp
index d05c9ff..808d9f2 100644
--- a/lib/CodeGen/CGCall.cpp
+++ b/lib/CodeGen/CGCall.cpp
@@ -963,7 +963,28 @@
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,