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llvm-6502/lib/IR
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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
..
AsmWriter.cpp IR: Print a newline when dumping Types 2014-08-12 03:24:59 +00:00
AsmWriter.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
AttributeImpl.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
Attributes.cpp Add a dereferenceable attribute 2014-07-18 15:51:28 +00:00
AutoUpgrade.cpp Don't upgrade global constructors when reading bitcode 2014-08-12 16:46:37 +00:00
BasicBlock.cpp Move helper for getting a terminating musttail call to BasicBlock 2014-08-12 00:05:15 +00:00
CMakeLists.txt IPO: Add use-list-order verifier 2014-07-25 14:49:26 +00:00
Comdat.cpp IR: Add COMDATs to the IR 2014-06-27 18:19:56 +00:00
ConstantFold.cpp IR: Don't add inbounds to GEPs of extern_weak variables 2014-08-16 01:54:32 +00:00
ConstantFold.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
ConstantRange.cpp
Constants.cpp InstCombine: Fix a potential bug in 0 - (X sdiv C) -> (X sdiv -C) 2014-08-16 09:23:42 +00:00
ConstantsContext.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
Core.cpp [LLVM-C] Expose User::getOperandUse as LLVMGetOperandUse. 2014-08-12 02:55:40 +00:00
DataLayout.cpp Revert "Introduce a string_ostream string builder facilty" 2014-06-26 22:52:05 +00:00
DebugInfo.cpp Revert "Reapply "DebugInfo: Ensure that all debug location scope chains from instructions within a function, lead to the function itself."" 2014-08-06 22:30:12 +00:00
DebugLoc.cpp Add missing const specifier to a const method. 2014-06-05 14:32:15 +00:00
DiagnosticInfo.cpp Rename DiagnosticInfoOptimizationWarning to DiagnosticInfoOptimizationFailure 2014-07-18 19:36:04 +00:00
DiagnosticPrinter.cpp
DIBuilder.cpp Debug info: Infrastructure to support debug locations for fragmented 2014-08-01 22:11:58 +00:00
Dominators.cpp Revert "[C++11] Add predecessors(BasicBlock *) / successors(BasicBlock *) iterator ranges." 2014-07-21 17:06:51 +00:00
Function.cpp Provide convenient access to the zext/sext attributes of function arguments. NFC. 2014-08-05 05:43:41 +00:00
GCOV.cpp Update the MemoryBuffer API to use ErrorOr. 2014-07-06 17:43:13 +00:00
Globals.cpp IR: Add COMDATs to the IR 2014-06-27 18:19:56 +00:00
GVMaterializer.cpp
InlineAsm.cpp
Instruction.cpp IR: add "cmpxchg weak" variant to support permitted failure. 2014-06-13 14:24:07 +00:00
Instructions.cpp Add CreatePointerBitCastOrAddrSpaceCast to IRBuilder and co. 2014-07-14 17:24:35 +00:00
IntrinsicInst.cpp
IRBuilder.cpp Add scoped-noalias metadata 2014-07-24 14:25:39 +00:00
IRPrintingPasses.cpp Fix some misplaced spaces around 'override' 2014-05-24 20:19:40 +00:00
LeakDetector.cpp
LeaksContext.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
LegacyPassManager.cpp Fix typos: 2014-08-11 18:04:46 +00:00
LLVMBuild.txt
LLVMContext.cpp Add scoped-noalias metadata 2014-07-24 14:25:39 +00:00
LLVMContextImpl.cpp Remove LLVMContextImpl::optimizationRemarkEnabledFor. 2014-05-22 17:19:01 +00:00
LLVMContextImpl.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
Makefile
Mangler.cpp Don't count inreg params when mangling fastcall functions 2014-08-06 18:09:04 +00:00
MDBuilder.cpp Simplify and improve scoped-noalias metadata semantics 2014-07-25 15:50:02 +00:00
Metadata.cpp Add scoped-noalias metadata 2014-07-24 14:25:39 +00:00
Module.cpp IR: cleanup Module::dropReferences 2014-07-03 16:12:55 +00:00
module.modulemap [modules] Add module maps for LLVM. These are not quite ready for prime-time 2014-05-21 02:46:14 +00:00
Pass.cpp Remove pimpl class from PassRegistry. 2014-06-12 16:06:51 +00:00
PassManager.cpp Remove unnecessary/redundant std::move 2014-07-16 17:09:21 +00:00
PassRegistry.cpp Remove pimpl class from PassRegistry. 2014-06-12 16:06:51 +00:00
SymbolTableListTraitsImpl.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
Type.cpp pr20588: add missing calls to va_end. 2014-08-08 15:57:37 +00:00
TypeFinder.cpp
Use.cpp
UseListOrder.cpp verify-uselistorder: Move shuffleUseLists() out of lib/IR 2014-08-01 23:03:36 +00:00
User.cpp
Value.cpp IR: Add Value::reverseUseList() 2014-08-01 23:28:49 +00:00
ValueSymbolTable.cpp
ValueTypes.cpp
Verifier.cpp Revert "[C++11] Add predecessors(BasicBlock *) / successors(BasicBlock *) iterator ranges." 2014-07-21 17:06:51 +00:00