MC/AsmParser: Attempt to constant fold expressions up-front. This ensures we avoid fixups for obvious cases like '-(16)'.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96064 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index d5bc396..51ad5d1 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -325,9 +325,17 @@
/// expr ::= primaryexpr
///
bool AsmParser::ParseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
+ // Parse the expression.
Res = 0;
- return ParsePrimaryExpr(Res, EndLoc) ||
- ParseBinOpRHS(1, Res, EndLoc);
+ if (ParsePrimaryExpr(Res, EndLoc) || ParseBinOpRHS(1, Res, EndLoc))
+ return true;
+
+ // Try to constant fold it up front, if possible.
+ int64_t Value;
+ if (Res->EvaluateAsAbsolute(Value))
+ Res = MCConstantExpr::Create(Value, getContext());
+
+ return false;
}
bool AsmParser::ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {