Sanjay Patel 2e33bbaff0 [InstCombine] lshr (sext iM X to iN), N-M --> zext (ashr X, min(N-M, M-1)) to iN ...

This is a follow-up to https://reviews.llvm.org/D33879 / https://reviews.llvm.org/rL304939 ,
and was discussed in https://reviews.llvm.org/D33338.

We prefer this form because a narrower shift may be cheaper, and we can more easily fold a
zext than a sext.

http://rise4fun.com/Alive/slVe

Name: shz
%s = sext i8 %x to i12
%r = lshr i12 %s, 4
=>
%a = ashr i8 %x, 4
%r = zext i8 %a to i12 

llvm-svn: 305190

2017-06-12 14:23:43 +00:00

..

CMakeLists.txt

[CMake] NFC. Updating CMake dependency specifications

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

InstCombineAddSub.cpp

[InstCombine] Pass a proper context instruction to all of the calls into InstSimplify

2017-06-09 03:21:29 +00:00

InstCombineAndOrXor.cpp

[InstCombine] Pass a proper context instruction to all of the calls into InstSimplify

2017-06-09 03:21:29 +00:00

InstCombineCalls.cpp

[InstSimplify] Don't constant fold or DCE calls that are marked nobuiltin

2017-06-09 23:18:11 +00:00

InstCombineCasts.cpp

[InstCombine][InstSimplify] Use APInt::isNullValue/isOneValue to reduce compiled code for comparing APInts with 0 and 1. NFC

2017-06-07 07:40:37 +00:00

InstCombineCompares.cpp

[InstCombine][InstSimplify] Use APInt::isNullValue/isOneValue to reduce compiled code for comparing APInts with 0 and 1. NFC

2017-06-07 07:40:37 +00:00

InstCombineInternal.h

Move Object format code to lib/BinaryFormat.

2017-06-07 03:48:56 +00:00

InstCombineLoadStoreAlloca.cpp

[ValueTracking] Replace all uses of ComputeSignBit with computeKnownBits.

2017-05-15 06:39:41 +00:00

InstCombineMulDivRem.cpp

[InstCombine] Pass a proper context instruction to all of the calls into InstSimplify

2017-06-09 03:21:29 +00:00

InstCombinePHI.cpp

[InstCombine] Pass a proper context instruction to all of the calls into InstSimplify

2017-06-09 03:21:29 +00:00

InstCombineSelect.cpp

[InstCombine] Pass a proper context instruction to all of the calls into InstSimplify

2017-06-09 03:21:29 +00:00

InstCombineShifts.cpp

[InstCombine] lshr (sext iM X to iN), N-M --> zext (ashr X, min(N-M, M-1)) to iN

2017-06-12 14:23:43 +00:00

InstCombineSimplifyDemanded.cpp

[InstCombine][InstSimplify] Use APInt::isNullValue/isOneValue to reduce compiled code for comparing APInts with 0 and 1. NFC

2017-06-07 07:40:37 +00:00

InstCombineVectorOps.cpp

[InstCombine] Pass a proper context instruction to all of the calls into InstSimplify

2017-06-09 03:21:29 +00:00

InstructionCombining.cpp

[InstCombine] Pass a proper context instruction to all of the calls into InstSimplify

2017-06-09 03:21:29 +00:00

LLVMBuild.txt

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

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