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3bbb4b15ae
llvm-6502/include/llvm
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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
..
ADT Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
Analysis Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
AsmParser
Bitcode Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
CodeGen Make isAliased property for fixed-offset stack objects adjustable 2014-08-16 00:17:02 +00:00
Config Regenerate autoconf, previous updates to the configury haven't 2014-07-28 22:00:44 +00:00
DebugInfo Use a reference instead of a pointer. 2014-07-31 20:19:36 +00:00
ExecutionEngine Simplify ownership with std::unique_ptr. NFC. 2014-08-13 18:49:01 +00:00
IR InstCombine: Fix a potential bug in 0 - (X sdiv C) -> (X sdiv -C) 2014-08-16 09:23:42 +00:00
IRReader Make a helper function static. No functionality change. 2014-07-05 00:39:08 +00:00
LineEditor
Linker IR: Add COMDATs to the IR 2014-06-27 18:19:56 +00:00
LTO Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
MC Make EmitAbsValue an static helper. 2014-08-15 15:12:13 +00:00
Object Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
Option Option: Propagate flags from groups to options in each group 2014-07-12 00:18:58 +00:00
ProfileData Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
Support Revert "[Support] Promote cl::StringSaver to a separate utility" 2014-08-15 23:39:01 +00:00
TableGen Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
Target [PowerPC] Implement PPCTargetLowering::getTgtMemIntrinsic 2014-08-13 01:15:40 +00:00
Transforms Introduce a helper to combine instruction metadata. 2014-08-15 15:46:38 +00:00
CMakeLists.txt Remove llvm_headers_do_not_build for the benefit of XCode and Visual Studio users. 2014-08-14 00:51:47 +00:00
InitializePasses.h MachineCombiner Pass for selecting faster instruction 2014-08-03 21:35:39 +00:00
LinkAllIR.h
LinkAllPasses.h Move -verify-use-list-order into llvm-uselistorder 2014-07-25 17:13:03 +00:00
module.modulemap [modules] Update module map workaround to cope with the problematic file having 2014-08-07 20:27:08 +00:00
module.modulemap.build
Pass.h
PassAnalysisSupport.h
PassInfo.h Remove pimpl class from PassRegistry. 2014-06-12 16:06:51 +00:00
PassManager.h
PassRegistry.h Remove pimpl class from PassRegistry. 2014-06-12 16:06:51 +00:00
PassSupport.h Move GlobalMerge from Transform to CodeGen. 2014-06-13 22:57:59 +00:00