x86 backend doesn't lower x%255 to multiply

|  |  |
| --- | --- |
| Bugzilla Link | [945](https://llvm.org/bz945) |
| Resolution | FIXED |
| Resolved on | Feb 22, 2010 12:49 |
| Version | 1.0 |
| OS | All |

## Extended Description 
Consider:

int test(int X) {
  return X%255;
}

The PPC backend lowers this to mulhw+stuff, the X86 backend should too.  It is the major reason we are 
slower at Benchmarks/Misc/ReedSolomon.c than GCC.

-Chris