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| author | Fangrui Song <maskray@google.com> | 2019-04-19 02:06:06 +0000 |
|---|---|---|
| committer | Fangrui Song <maskray@google.com> | 2019-04-19 02:06:06 +0000 |
| commit | acc7641bcb9df243e7c2e0e8c4636929e21642e8 (patch) | |
| tree | d83e501952ef4e055f288699cbb06b59aeac0fee /llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp | |
| parent | 9206335e9d100e65f85a73168400875839405f20 (diff) | |
| download | bcm5719-llvm-acc7641bcb9df243e7c2e0e8c4636929e21642e8.tar.gz bcm5719-llvm-acc7641bcb9df243e7c2e0e8c4636929e21642e8.zip | |
[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
Diffstat (limited to 'llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp')
0 files changed, 0 insertions, 0 deletions
