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Add a fast path to EvaluateSymbolicAdd. This avoids computing symbol addresses 

which then avoids running EnsureValid.
This cuts the assembly time of the testcase in PR8711 from 2:50 minutes to 1
minute.

llvm-svn: 120697
This commit is contained in:
Rafael Espindola 2010-12-02 07:53:12 +00:00
parent 90af90967a
commit bf792065a9
1 changed files with 11 additions and 3 deletions
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14
llvm/lib/MC/MCExpr.cpp
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@ -294,12 +294,20 @@ static bool EvaluateSymbolicAdd(const MCAsmLayout *Layout, bool InSet,
if (Layout && A && B) {
const MCSymbol &SA = A->getSymbol();
const MCSymbol &SB = B->getSymbol();
const MCObjectFormat &F =
Layout->getAssembler().getBackend().getObjectFormat();
const MCAssembler &Asm = Layout->getAssembler();
const MCObjectFormat &F = Asm.getBackend().getObjectFormat();
if (SA.isDefined() && SB.isDefined() && F.isAbsolute(InSet, SA, SB)) {
const MCAssembler &Asm = Layout->getAssembler();
MCSymbolData &AD = Asm.getSymbolData(A->getSymbol());
MCSymbolData &BD = Asm.getSymbolData(B->getSymbol());
if (AD.getFragment() == BD.getFragment()) {
Res = MCValue::get(+ AD.getOffset()
- BD.getOffset()
+ LHS.getConstant()
+ RHS_Cst);
return true;
}
Res = MCValue::get(+ Layout->getSymbolAddress(&AD)
- Layout->getSymbolAddress(&BD)
+ LHS.getConstant()