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| author | Rafael Espindola <rafael.espindola@gmail.com> | 2010-12-02 07:53:12 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2010-12-02 07:53:12 +0000 |
| commit | 76507f14edbfa7729775ee73173de735aa2f4781 (patch) | |
| tree | c2aaa645e0c2e5c2e10f7787e7d23e2cf7f6bb9b /lib/MC/MCExpr.cpp | |
| parent | 37a0b54fb5e2fffb1c1e4270111fd283a82dc828 (diff) | |
| download | llvm-76507f14edbfa7729775ee73173de735aa2f4781.tar.gz llvm-76507f14edbfa7729775ee73173de735aa2f4781.tar.bz2 llvm-76507f14edbfa7729775ee73173de735aa2f4781.tar.xz | |
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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120697 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/MC/MCExpr.cpp')
| -rw-r--r-- | lib/MC/MCExpr.cpp | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/lib/MC/MCExpr.cpp b/lib/MC/MCExpr.cpp index 6eab0bd30d..64c57b335c 100644 --- a/lib/MC/MCExpr.cpp +++ b/lib/MC/MCExpr.cpp @@ -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() |