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| author | Sanjay Patel <spatel@rotateright.com> | 2017-08-04 15:42:47 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2017-08-04 15:42:47 +0000 |
| commit | 79e7f6b3e394ad2f3b58581085847b4bb11fdc75 (patch) | |
| tree | 9473613f14dc301e4685f83eaf774190908ba3f9 /llvm/lib/Analysis/ModuleSummaryAnalysis.cpp | |
| parent | 4b11a78a6e34eee30b41e7edec47d9af5c400ed6 (diff) | |
| download | bcm5719-llvm-79e7f6b3e394ad2f3b58581085847b4bb11fdc75.tar.gz bcm5719-llvm-79e7f6b3e394ad2f3b58581085847b4bb11fdc75.zip | |
[InstCombine] narrow lshr with constant
Name: narrow_shift
Pre: C1 < 8
%zx = zext i8 %x to i32
%l = lshr i32 %zx, C1
=>
%narrowC = trunc i32 C1 to i8
%ns = lshr i8 %x, %narrowC
%l = zext i8 %ns to i32
http://rise4fun.com/Alive/jIV
This isn't directly applicable to PR34046 as written, but we
need to have more narrowing folds like this to be sure that
rotate patterns are recognized.
llvm-svn: 310060
Diffstat (limited to 'llvm/lib/Analysis/ModuleSummaryAnalysis.cpp')
0 files changed, 0 insertions, 0 deletions
