From ca0546facc5af4c27a5efd5ff80935ba05ae030a Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Fri, 17 Oct 2008 01:33:43 +0000 Subject: Fun x86 encoding tricks: when adding an immediate value of 128, use a SUB instruction instead of an ADD, because -128 can be encoded in an 8-bit signed immediate field, while +128 can't be. This avoids the need for a 32-bit immediate field in this case. A similar optimization applies to 64-bit adds with 0x80000000, with the 32-bit signed immediate field. To support this, teach tablegen how to handle 64-bit constants. llvm-svn: 57663 --- llvm/utils/TableGen/TGParser.cpp | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'llvm/utils/TableGen/TGParser.cpp') diff --git a/llvm/utils/TableGen/TGParser.cpp b/llvm/utils/TableGen/TGParser.cpp index 68a1cba3da5..4ff108d2603 100644 --- a/llvm/utils/TableGen/TGParser.cpp +++ b/llvm/utils/TableGen/TGParser.cpp @@ -294,8 +294,8 @@ bool TGParser::ParseRangePiece(std::vector &Ranges) { TokError("expected integer or bitrange"); return true; } - int Start = Lex.getCurIntVal(); - int End; + int64_t Start = Lex.getCurIntVal(); + int64_t End; if (Start < 0) return TokError("invalid range, cannot be negative"); @@ -426,7 +426,7 @@ RecTy *TGParser::ParseType() { TokError("expected integer in bits type"); return 0; } - unsigned Val = Lex.getCurIntVal(); + uint64_t Val = Lex.getCurIntVal(); if (Lex.Lex() != tgtok::greater) { // Eat count. TokError("expected '>' at end of bits type"); return 0; -- cgit v1.2.3