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
diff --git a/lib/MC/MCExpr.cpp b/lib/MC/MCExpr.cpp
index 6eab0bd..64c57b3 100644
--- a/lib/MC/MCExpr.cpp
+++ b/lib/MC/MCExpr.cpp
@@ -294,12 +294,20 @@
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()