Sanjay Patel 095a0b49b3 [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


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294898 91177308-0d34-0410-b5e6-96231b3b80d8

2017-02-12 16:40:30 +00:00

..

CMakeLists.txt

[CMake] NFC. Updating CMake dependency specifications

2016-11-17 04:36:50 +00:00

InstCombineAddSub.cpp

[InstCombine] add a wrapper for a common pair of transforms; NFCI

2017-01-10 23:49:07 +00:00

InstCombineAndOrXor.cpp

[InstCombine] Fold ((C1 OP zext(X)) & C2) -> zext((C1 OP X) & C2)

2017-01-17 18:08:06 +00:00

InstCombineCalls.cpp

[InstComobineCalls] Fix buildbot failures after r294453.

2017-02-08 15:21:48 +00:00

InstCombineCasts.cpp

fix formatting; NFC

2017-01-31 17:25:42 +00:00

InstCombineCompares.cpp

[InstCombine] fold icmp sgt/slt (add nsw X, C2), C --> icmp sgt/slt X, (C - C2)

2017-02-12 16:40:30 +00:00

InstCombineInternal.h

Fix invalid addrspacecast due to combining alloca with global var

2017-02-10 21:46:07 +00:00

InstCombineLoadStoreAlloca.cpp

[InstCombine] Move class into anonymous namespace. NFC.

2017-02-10 22:26:35 +00:00

InstCombineMulDivRem.cpp

[InstCombine] add a wrapper for a common pair of transforms; NFCI

2017-01-10 23:49:07 +00:00

InstCombinePHI.cpp

fix formatting; NFC

2017-01-31 17:25:42 +00:00

InstCombineSelect.cpp

Use InstCombine's builder in foldSelectCttzCtlz instead of creating a new one.

2017-01-24 17:48:25 +00:00

InstCombineShifts.cpp

[InstCombine] allow (X * C2) << C1 --> X * (C2 << C1) for vectors

2017-02-09 23:13:04 +00:00

InstCombineSimplifyDemanded.cpp

[InstCombine] use m_APInt to allow demanded bits analysis on splat constants

2017-02-09 21:43:06 +00:00

InstCombineVectorOps.cpp

[InstCombine] Use getVectorNumElements instead of explicitly casting to VectorType and calling getNumElements. NFC

2016-12-29 07:03:18 +00:00

InstructionCombining.cpp

[InstCombine] Make max size array combine a tunable.

2017-02-07 17:56:50 +00:00

LLVMBuild.txt

Update libdeps since TLI was moved from Target to Analysis in r226078.

2015-01-15 05:21:00 +00:00