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start adding logic in isel to determine asm printer semantics, step N of M.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74246 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-06-26 00:43:52 +00:00
parent e1047fbb97
commit 55e7c82730
2 changed files with 29 additions and 8 deletions
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25
lib/Target/X86/X86ISelLowering.cpp
View File

@ -4507,14 +4507,25 @@ X86TargetLowering::LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) {
SDValue X86TargetLowering::LowerJumpTable(SDValue Op, SelectionDAG &DAG) {
JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
// FIXME there isn't really any debug into here
DebugLoc dl = JT->getDebugLoc();
SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), getPointerTy());
Result = DAG.getNode(X86ISD::Wrapper, dl, getPointerTy(), Result);
// In PIC mode (unless we're in RIPRel PIC mode) we add an offset to the
// global base reg.
unsigned char JTFlag = 0;
if (getTargetMachine().getRelocationModel() == Reloc::PIC_) {
if (Subtarget->isPICStyleStub())
JTFlag = X86II::MO_PIC_BASE_OFFSET;
else if (Subtarget->isPICStyleGOT())
JTFlag = X86II::MO_GOTOFF;
}
SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), getPointerTy(),
JTFlag);
DebugLoc DL = JT->getDebugLoc();
Result = DAG.getNode(X86ISD::Wrapper, DL, getPointerTy(), Result);
// With PIC, the address is actually $g + Offset.
if (getTargetMachine().getRelocationModel() == Reloc::PIC_ &&
!Subtarget->isPICStyleRIPRel()) {
Result = DAG.getNode(ISD::ADD, dl, getPointerTy(),
if (JTFlag) {
Result = DAG.getNode(ISD::ADD, DL, getPointerTy(),
DAG.getNode(X86ISD::GlobalBaseReg,
DebugLoc::getUnknownLoc(),
getPointerTy()),

12
lib/Target/X86/X86InstrInfo.h
View File

@ -77,9 +77,19 @@ namespace X86II {
/// MO_GOT_ABSOLUTE_ADDRESS - On a symbol operand, this represents a
/// relocation of:
/// $SYMBOL_LABEL + [. - PICBASELABEL]
/// SYMBOL_LABEL + [. - PICBASELABEL]
MO_GOT_ABSOLUTE_ADDRESS = 1,
/// MO_PIC_BASE_OFFSET - On a symbol operand this indicates that the
/// immediate should get the value of the symbol minus the PIC base label:
/// SYMBOL_LABEL - PICBASELABEL
MO_PIC_BASE_OFFSET = 2,
/// MO_GOTOFF - On a symbol operand this indicates that the immediate should
/// the offset to the location of the symbol name from the base of the GOT.
/// SYMBOL_LABEL @GOTOFF
MO_GOTOFF = 3,
//===------------------------------------------------------------------===//
// Instruction encodings. These are the standard/most common forms for X86