David Majnemer 3bbb4b15ae 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215818 91177308-0d34-0410-b5e6-96231b3b80d8

2014-08-16 09:23:42 +00:00

..

Hello

[CMake] Add LLVM_LINK_COMPONENTS to loadable modules, LLVMHello and BugpointPasses, on Win32.

2014-07-13 13:36:48 +00:00

InstCombine

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

2014-08-16 09:23:42 +00:00

Instrumentation

Canonicalize header guards into a common format.

2014-08-13 16:26:38 +00:00

IPO

[optnone] Make the optnone attribute effective at suppressing function

2014-08-13 10:49:33 +00:00

ObjCARC

Canonicalize header guards into a common format.

2014-08-13 16:26:38 +00:00

Scalar

Introduce a helper to combine instruction metadata.

2014-08-15 15:46:38 +00:00

Utils

Introduce a helper to combine instruction metadata.

2014-08-15 15:46:38 +00:00

Vectorize

Introduce a helper to combine instruction metadata.

2014-08-15 15:46:38 +00:00

CMakeLists.txt

Extracted ObjCARC.cpp into its own library libLLVMObjCARCOpts in preparation for refactoring the ARC Optimizer.

2013-01-28 01:35:51 +00:00

LLVMBuild.txt

Extracted ObjCARC.cpp into its own library libLLVMObjCARCOpts in preparation for refactoring the ARC Optimizer.

2013-01-28 01:35:51 +00:00

Makefile

Extracted ObjCARC.cpp into its own library libLLVMObjCARCOpts in preparation for refactoring the ARC Optimizer.

2013-01-28 01:35:51 +00:00