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| author | Chris Lattner <sabre@nondot.org> | 2009-12-21 04:04:05 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2009-12-21 04:04:05 +0000 |
| commit | 3bf68155563cac6848d671848d875f41ad7e3277 (patch) | |
| tree | 396f56075134fb3d58520cdb78c3ccbe58bf6409 /unittests/ADT/StringRefTest.cpp | |
| parent | 2799bafb98676c000388f8636d58064f2646266e (diff) | |
enhance x-(-A) -> x+A to preserve NUW/NSW.
Use the presence of NSW/NUW to fold "icmp (x+cst), x" to a constant in
cases where it would otherwise be undefined behavior.
Surprisingly (to me at least), this triggers hundreds of the times in
a few benchmarks: lencode, ldecode, and 466.h264ref seem to *really*
like this.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91812 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'unittests/ADT/StringRefTest.cpp')
0 files changed, 0 insertions, 0 deletions