In the BINARY_ADD opcode, and in most arithmetic opcodes, there is a line
that checks for overflow that looks like this:
if ((i^a) < 0 && (i^b) < 0) goto slow_add;
I got a small speedup by replacing this with a macro defined thusly:
#if defined(_MSC_VER) and defined(_M_IX86)
#define IF_OVERFLOW_GOTO(X) __asm { jo X };
#else
#define IF_OVERFLOW_GOTO(X) if ((i^a) < 0 && (i^b) < 0) goto X;
#endif
Would this case be an acceptable use of snippets of inline assembler?
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