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| author | Evan Cheng <evan.cheng@apple.com> | 2010-01-18 21:38:44 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2010-01-18 21:38:44 +0000 |
| commit | 88b65bc835444e4cac27fa8032948f7bb51781fa (patch) | |
| tree | 294ad7bf833fb1620b80aa4765c93a69c152508d /clang/tools/c-index-test | |
| parent | 5a52727ad089672ea447535aa627fa150e39c7ac (diff) | |
| download | bcm5719-llvm-88b65bc835444e4cac27fa8032948f7bb51781fa.tar.gz bcm5719-llvm-88b65bc835444e4cac27fa8032948f7bb51781fa.zip | |
Canonicalize -1 - x to ~x.
Instcombine does this but apparently there are situations where this pattern will escape the optimizer and / or created by isel. Here is a case that's seen in JavaScriptCore:
%t1 = sub i32 0, %a
%t2 = add i32 %t1, -1
The dag combiner pattern: ((c1-A)+c2) -> (c1+c2)-A
will fold it to -1 - %a.
llvm-svn: 93773
Diffstat (limited to 'clang/tools/c-index-test')
0 files changed, 0 insertions, 0 deletions
