disclaimer: this is just for fun.... differences should be in the
noise in any complex system, and I'm not suggesting any code changes.
Actually, with 32 bit registers, x<0 should be faster than x==-1 by
one cycle. If it doesn't test faster, then it's because of some
optimizations that could be pulled off via inlining and data flow
analysis (set of -1 followed by a check for -1, etc).
Here's the optimized code that gcc produces for a 64 bit long comparison:
# if (foo() == -1)
andl %edx, %eax
incl %eax
jne L2
# if (foo() < 0)
testl %edx, %edx
jns L9
-Yonik
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