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| author | Sanjay Patel <spatel@rotateright.com> | 2017-02-12 16:40:30 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2017-02-12 16:40:30 +0000 |
| commit | 45b7e69fefae98ad3c747fd090e6aafcf2cba94f (patch) | |
| tree | ea1cd8ab1db48e0651966ca69112cb823157a946 /lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.cpp | |
| parent | 97e4b98749572c96eecfdd3860437cab5d688b8b (diff) | |
[InstCombine] fold icmp sgt/slt (add nsw X, C2), C --> icmp sgt/slt X, (C - C2)
I found one special case of this transform for 'slt 0', so I removed that and added the general transform.
Alive code to check correctness:
Name: slt_no_overflow
Pre: WillNotOverflowSignedSub(C1, C2)
%a = add nsw i8 %x, C2
%b = icmp slt %a, C1
=>
%b = icmp slt %x, C1 - C2
Name: sgt_no_overflow
Pre: WillNotOverflowSignedSub(C1, C2)
%a = add nsw i8 %x, C2
%b = icmp sgt %a, C1
=>
%b = icmp sgt %x, C1 - C2
http://rise4fun.com/Alive/MH
Differential Revision: https://reviews.llvm.org/D29774
llvm-svn: 294898
Diffstat (limited to 'lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.cpp')
0 files changed, 0 insertions, 0 deletions