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* Materialize GlobalAddress and ExternalSym with MOV32ri rather than 

LEA32r.
* Do not lower GlobalAddress to TargetGlobalAddress. Let isel does it.

llvm-svn: 25246
This commit is contained in:
Evan Cheng 2006-01-12 07:56:47 +00:00
parent e6300aaabc
commit b94db9e9a4
2 changed files with 10 additions and 8 deletions
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11
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -1723,8 +1723,8 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
DAG.getValueType(AVT), InFlag);
}
case ISD::GlobalAddress: {
SDOperand Result;
GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
SDOperand GVOp = DAG.getTargetGlobalAddress(GV, getPointerTy());
// For Darwin, external and weak symbols are indirect, so we want to load
// the value at address GV, not the value of GV itself. This means that
// the GlobalAddress must be in the base or index register of the address,
@ -1732,11 +1732,10 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
if (getTargetMachine().
getSubtarget<X86Subtarget>().getIndirectExternAndWeakGlobals() &&
(GV->hasWeakLinkage() || GV->isExternal()))
return DAG.getLoad(MVT::i32, DAG.getEntryNode(),
GVOp, DAG.getSrcValue(NULL));
else
return GVOp;
break;
Result = DAG.getLoad(MVT::i32, DAG.getEntryNode(),
DAG.getTargetGlobalAddress(GV, getPointerTy()),
DAG.getSrcValue(NULL));
return Result;
}
}
}

7
llvm/lib/Target/X86/X86InstrInfo.td
View File

@ -153,8 +153,7 @@ def brtarget : Operand<OtherVT>;
// Define X86 specific addressing mode.
def addr : ComplexPattern<i32, 4, "SelectAddr", []>;
def leaaddr : ComplexPattern<i32, 4, "SelectLEAAddr",
[add, frameindex, constpool,
globaladdr, tglobaladdr, externalsym]>;
[add, frameindex, constpool]>;
//===----------------------------------------------------------------------===//
// X86 Instruction Format Definitions.
@ -2958,6 +2957,10 @@ def RDTSC : I<0x31, RawFrm, (ops), "rdtsc", [(X86rdtsc)]>,
// Non-Instruction Patterns
//===----------------------------------------------------------------------===//
// GlobalAddress and ExternalSymbol
def : Pat<(i32 globaladdr:$dst), (MOV32ri globaladdr:$dst)>;
def : Pat<(i32 externalsym:$dst), (MOV32ri externalsym:$dst)>;
// Calls
def : Pat<(X86call tglobaladdr:$dst),
(CALLpcrel32 tglobaladdr:$dst)>;