Jingyue Wu 33bd53df7f [InstCombine] mark ADD with nuw if no unsigned overflow ...

Summary:
As a starting step, we only use one simple heuristic: if the sign bits
of both a and b are zero, we can prove "add a, b" do not unsigned
overflow, and thus convert it to "add nuw a, b".

Updated all affected tests and added two new tests (@zero_sign_bit and
@zero_sign_bit2) in AddOverflow.ll

Test Plan: make check-all

Reviewers: eliben, rafael, meheff, chandlerc

Reviewed By: chandlerc

Subscribers: chandlerc, llvm-commits

Differential Revision: http://reviews.llvm.org/D4144

llvm-svn: 211084

2014-06-17 00:42:07 +00:00

..

CMakeLists.txt

…

InstCombine.h

[InstCombine] mark ADD with nuw if no unsigned overflow

2014-06-17 00:42:07 +00:00

InstCombineAddSub.cpp

[InstCombine] mark ADD with nuw if no unsigned overflow

2014-06-17 00:42:07 +00:00

InstCombineAndOrXor.cpp

Reorder shuffle and binary operation.

2014-05-11 08:46:12 +00:00

InstCombineCalls.cpp

[PPC64LE] Correct vperm -> shuffle transform for little endian

2014-06-05 19:46:04 +00:00

InstCombineCasts.cpp

Canonicalize addrspacecast ConstExpr between different pointer types

2014-06-15 21:40:57 +00:00

InstCombineCompares.cpp

Look through addrspacecasts when turning ptr comparisons into

2014-06-09 19:20:29 +00:00

InstCombineLoadStoreAlloca.cpp

[C++] Use 'nullptr'. Transforms edition.

2014-04-25 05:29:35 +00:00

InstCombineMulDivRem.cpp

Optimize integral reciprocal (udiv 1, x and sdiv 1, x) to not use division. This fires exactly once in a clang bootstrap, but covers a few different results from http://www.cs.utah.edu/~regehr/souper/

2014-05-14 03:03:05 +00:00

InstCombinePHI.cpp

[C++] Use 'nullptr'. Transforms edition.

2014-04-25 05:29:35 +00:00

InstCombineSelect.cpp

This removes TODO added in http://reviews.llvm.org/D3658

2014-06-12 14:06:00 +00:00

InstCombineShifts.cpp

Reorder shuffle and binary operation.

2014-05-11 08:46:12 +00:00

InstCombineSimplifyDemanded.cpp

Rename ComputeMaskedBits to computeKnownBits. "Masked" has been

2014-05-14 21:14:37 +00:00

InstCombineVectorOps.cpp

Fix type of shuffle resulted from shuffle merge.

2014-05-13 06:07:21 +00:00

InstCombineWorklist.h

[C++] Use 'nullptr'.

2014-04-28 04:05:08 +00:00

InstructionCombining.cpp

Add a Constant version of stripPointerCasts.

2014-06-04 19:01:48 +00:00

LLVMBuild.txt

…

Makefile

…