From ae6421935bd3f2e48346fd16a21297ed1a28fd32 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Fri, 2 Mar 2007 23:16:35 +0000
Subject: [PATCH] X86-64 VACOPY needs custom expansion. va_list is a struct {
i32, i32, i8*, i8* }.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34857 91177308-0d34-0410-b5e6-96231b3b80d8
---
lib/Target/X86/X86ISelLowering.cpp | 36 +++++++++++++++++++++++++++---
lib/Target/X86/X86ISelLowering.h | 1 +
2 files changed, 34 insertions(+), 3 deletions(-)
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 29db36bf32f..c0c7b79132a 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -236,11 +236,13 @@ X86TargetLowering::X86TargetLowering(TargetMachine &TM)
// VASTART needs to be custom lowered to use the VarArgsFrameIndex
setOperationAction(ISD::VASTART , MVT::Other, Custom);
-
- // Use the default implementation.
setOperationAction(ISD::VAARG , MVT::Other, Expand);
- setOperationAction(ISD::VACOPY , MVT::Other, Expand);
setOperationAction(ISD::VAEND , MVT::Other, Expand);
+ if (Subtarget->is64Bit())
+ setOperationAction(ISD::VACOPY , MVT::Other, Custom);
+ else
+ setOperationAction(ISD::VACOPY , MVT::Other, Expand);
+
setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
if (Subtarget->is64Bit())
@@ -3761,6 +3763,33 @@ SDOperand X86TargetLowering::LowerVASTART(SDOperand Op, SelectionDAG &DAG) {
return DAG.getNode(ISD::TokenFactor, MVT::Other, &MemOps[0], MemOps.size());
}
+SDOperand X86TargetLowering::LowerVACOPY(SDOperand Op, SelectionDAG &DAG) {
+ // X86-64 va_list is a struct { i32, i32, i8*, i8* }.
+ SDOperand Chain = Op.getOperand(0);
+ SDOperand DstPtr = Op.getOperand(1);
+ SDOperand SrcPtr = Op.getOperand(2);
+ SrcValueSDNode *DstSV = cast<SrcValueSDNode>(Op.getOperand(3));
+ SrcValueSDNode *SrcSV = cast<SrcValueSDNode>(Op.getOperand(4));
+
+ SrcPtr = DAG.getLoad(getPointerTy(), Chain, SrcPtr,
+ SrcSV->getValue(), SrcSV->getOffset());
+ Chain = SrcPtr.getValue(1);
+ for (unsigned i = 0; i < 3; ++i) {
+ SDOperand Val = DAG.getLoad(MVT::i64, Chain, SrcPtr,
+ SrcSV->getValue(), SrcSV->getOffset());
+ Chain = Val.getValue(1);
+ Chain = DAG.getStore(Chain, Val, DstPtr,
+ DstSV->getValue(), DstSV->getOffset());
+ if (i == 2)
+ break;
+ SrcPtr = DAG.getNode(ISD::ADD, getPointerTy(), SrcPtr,
+ DAG.getConstant(8, getPointerTy()));
+ DstPtr = DAG.getNode(ISD::ADD, getPointerTy(), DstPtr,
+ DAG.getConstant(8, getPointerTy()));
+ }
+ return Chain;
+}
+
SDOperand
X86TargetLowering::LowerINTRINSIC_WO_CHAIN(SDOperand Op, SelectionDAG &DAG) {
unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getValue();
@@ -3925,6 +3954,7 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
case ISD::MEMCPY: return LowerMEMCPY(Op, DAG);
case ISD::READCYCLECOUNTER: return LowerREADCYCLCECOUNTER(Op, DAG);
case ISD::VASTART: return LowerVASTART(Op, DAG);
+ case ISD::VACOPY: return LowerVACOPY(Op, DAG);
case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
diff --git a/lib/Target/X86/X86ISelLowering.h b/lib/Target/X86/X86ISelLowering.h
index 9e61aff05f4..2b7d03a03b0 100644
--- a/lib/Target/X86/X86ISelLowering.h
+++ b/lib/Target/X86/X86ISelLowering.h
@@ -405,6 +405,7 @@ namespace llvm {
SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerREADCYCLCECOUNTER(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG);
+ SDOperand LowerVACOPY(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerINTRINSIC_WO_CHAIN(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerRETURNADDR(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerFRAMEADDR(SDOperand Op, SelectionDAG &DAG);