Jakob Stoklund Olesen 8a0b0df10a Never clear <undef> flags on already joined copies. ...

RegisterCoalescer set <undef> flags on all operands of copy instructions
that are scheduled to be removed. This is so they won't affect
shrinkToUses() by introducing false register reads.

Make sure those <undef> flags are never cleared, or shrinkToUses() could
cause live intervals to end at instructions about to be deleted.

This would be a lot simpler if RegisterCoalescer could just erase joined
copies immediately instead of keeping all the to-be-deleted instructions
around.

This fixes PR12862. Unfortunately, bugpoint can't create a sane test
case for this. Like many other coalescer problems, this failure depends
of a very fragile series of events.

<rdar://problem/11474428>

llvm-svn: 157001

2012-05-17 18:32:42 +00:00

..

Analysis

reuse the result of some expensive computations in getSignExtendExpr() and getZeroExtendExpr()

2012-05-15 20:20:14 +00:00

Archive

Include cstdio in a few place that depended on getting it transitively through StringExtras.h

2012-03-23 11:35:30 +00:00

AsmParser

Convert assert(0) to llvm_unreachable

2012-02-07 05:05:23 +00:00

Bitcode

SwitchInst cosmetics: renamed "Hash" method to "hash"

2012-05-14 08:26:31 +00:00

CodeGen

Never clear <undef> flags on already joined copies.

2012-05-17 18:32:42 +00:00

DebugInfo

Fix a C++11 UDL conflict.

2012-04-04 20:33:56 +00:00

ExecutionEngine

Added LLIMCJITMemoryManager to the lli. This manager will be used for MCJIT instead of DefaultJIMMemoryManager.

2012-05-16 18:50:11 +00:00

Linker

Supply a C interface to the "LinkModules" method.

2012-05-09 08:55:40 +00:00

MC

Fix spacing after if.

2012-05-12 16:52:21 +00:00

Object

Fix the implementation of MachOObjectFile::isSectionZeroInit so it follows the MachO spec.

2012-05-02 02:31:28 +00:00

Support

[Support/YAMLParser] Use rtrim on plain scalars.

2012-05-14 22:43:34 +00:00

TableGen

Move llvm-tblgen's StringMatcher into the TableGen library so it can

2012-05-02 17:32:48 +00:00

Target

Remove incorrect pattern for ARM SMML instruction.

2012-05-17 13:12:13 +00:00

Transforms

Teach SimplifyLibCalls about stpcpy.

2012-05-15 11:46:21 +00:00

VMCore

enhance the intrinsic info stuff to emit encodings that don't fit in 32-bits into a

2012-05-17 15:55:41 +00:00

CMakeLists.txt

Move TableGen's parser and entry point into a library

2011-10-01 16:41:13 +00:00

LLVMBuild.txt

LLVMBuild: Introduce a common section which currently has a list of the

2011-12-12 22:45:54 +00:00

Makefile

Remove more of llvmc and dependencies.

2011-09-20 00:34:27 +00:00