| commit | acc7641bcb9df243e7c2e0e8c4636929e21642e8 | [log] [tgz] |
|---|---|---|
| author | Fangrui Song <maskray@google.com> | Fri Apr 19 02:06:06 2019 +0000 |
| committer | Fangrui Song <maskray@google.com> | Fri Apr 19 02:06:06 2019 +0000 |
| tree | d83e501952ef4e055f288699cbb06b59aeac0fee | |
| parent | 9206335e9d100e65f85a73168400875839405f20 [diff] |
[APInt] Optimize umul_ov Change two costly udiv() calls to lshr(1)*RHS + left-shift + plus On one 64-bit umul_ov benchmark, I measured an obvious improvement: 12.8129s -> 3.6257s Note, there may be some value to special case 64-bit (the most common case) with __builtin_umulll_overflow(). Differential Revision: https://reviews.llvm.org/D60669 llvm-svn: 358730