David Majnemer 4eff4f7003 Merging r215818: ...

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r215818 | majnemer | 2014-08-16 02:23:42 -0700 (Sat, 16 Aug 2014) | 12 lines

InstCombine: Fix a potential bug in 0 - (X sdiv C)  -> (X sdiv -C)

While *most* (X sdiv 1) operations will get caught by InstSimplify, it
is still possible for a sdiv to appear in the worklist which hasn't been
simplified yet.

This means that it is possible for 0 - (X sdiv 1) to get transformed
into (X sdiv -1); dividing by -1 can make the transform produce undef
values instead of the proper result.

Sorry for the lack of testcase, it's a bit problematic because it relies
on the exact order of operations in the worklist.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_35@223645 91177308-0d34-0410-b5e6-96231b3b80d8

2014-12-08 09:11:48 +00:00

..

CMakeLists.txt

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InstCombine.h

[InstCombine] mark ADD with nuw if no unsigned overflow

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

InstCombineAddSub.cpp

Merging r215818:

2014-12-08 09:11:48 +00:00

InstCombineAndOrXor.cpp

Move optimization of some cases of (A & C1)|(B & C2) from instcombine to instsimplify. Patch by Rahul Jain, plus some last minute changes by me -- you can blame me for any bugs.

2014-06-19 03:51:46 +00:00

InstCombineCalls.cpp

InstCombine: Strength reduce sadd.with.overflow into a regular nsw add if we can prove that it cannot overflow.

2014-07-04 10:22:21 +00:00

InstCombineCasts.cpp

Fix comment in InstCombiner::visitAddrSpaceCast.

2014-07-16 01:34:21 +00:00

InstCombineCompares.cpp

InstCombine: Simplify code, no functionality change.

2014-07-07 11:01:16 +00:00

InstCombineLoadStoreAlloca.cpp

Use pointer type cast helpers.

2014-07-14 17:24:38 +00:00

InstCombineMulDivRem.cpp

InstCombine: Optimize x/INT_MIN to x==INT_MIN

2014-07-02 06:42:13 +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

Move ashr optimization from InstCombineShift to InstSimplify.

2014-07-17 06:28:15 +00:00

InstCombineSimplifyDemanded.cpp

Rename ComputeMaskedBits to computeKnownBits. "Masked" has been

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

InstCombineVectorOps.cpp

fixed some typos

2014-07-07 22:13:58 +00:00

InstCombineWorklist.h

[C++] Use 'nullptr'.

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

InstructionCombining.cpp

Revert "[C++11] Add predecessors(BasicBlock *) / successors(BasicBlock *) iterator ranges."

2014-07-21 17:06:51 +00:00

LLVMBuild.txt

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Makefile

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