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cpupm
2019 Mar 04
2
Where's the optimiser gone (part 11): use the proper instruction for sign extension
Compile with -O3 -m32 (see <https://godbolt.org/z/yCpBpM>):
long lsign(long x)
{
return (x > 0) - (x < 0);
}
long long llsign(long long x)
{
return (x > 0) - (x < 0);
}
While the code generated for the "long" version of this function is quite
OK, the code for the "long long" version misses an obvious optimi...