Meador Inge 30d8f0e977 Normalize memcmp constant folding results. ...

The library call simplifier folds memcmp calls with all constant arguments
to a constant.  For example:

  memcmp("foo", "foo", 3) ->  0
  memcmp("hel", "foo", 3) ->  1
  memcmp("foo", "hel", 3) -> -1

The folding is implemented in terms of the system memcmp that LLVM gets
linked with.  It currently just blindly uses the value returned from
the system memcmp as the folded constant.

This patch normalizes the values returned from the system memcmp to
(-1, 0, 1) so that we get consistent results across multiple platforms.
The test cases were adjusted accordingly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167726 91177308-0d34-0410-b5e6-96231b3b80d8

2012-11-12 14:00:45 +00:00

..

AddrModeMatcher.cpp

Move TargetData to DataLayout.

2012-10-08 16:38:25 +00:00

BasicBlockUtils.cpp

Move SplitBlockAndInsertIfThen to BasicBlockUtils.

2012-10-19 10:48:31 +00:00

BreakCriticalEdges.cpp

Revert 'Fix a typo 'iff' => 'if''. iff is an abreviation of if and only if. See: http://en.wikipedia.org/wiki/If_and_only_if Commit 164767

2012-09-27 10:14:43 +00:00

BuildLibCalls.cpp

Revert the series of commits starting with r166578 which introduced the

2012-11-01 08:07:29 +00:00

BypassSlowDivision.cpp

This patch corrects commit 165126 by using an integer bit width instead of

2012-10-04 21:33:40 +00:00

CloneFunction.cpp

Add an enum for the return and function indexes into the AttrListPtr object. This gets rid of some magic numbers.

2012-10-15 07:29:08 +00:00

CloneModule.cpp

Extend the IL for selecting TLS models (PR9788)

2012-06-23 11:37:03 +00:00

CMakeLists.txt

Implement new LibCallSimplifier class

2012-10-13 16:45:24 +00:00

CmpInstAnalysis.cpp

Convert assert(0) to llvm_unreachable

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

CodeExtractor.cpp

Have 'addFnAttr' take the attribute enum value. Then have it build the attribute object and add it appropriately. No functionality change.

2012-10-10 03:12:49 +00:00

DemoteRegToStack.cpp

Remove redundant comment. Use a more efficient datatype.

2012-02-17 02:12:54 +00:00

InlineFunction.cpp

Move TargetData to DataLayout.

2012-10-08 16:38:25 +00:00

InstructionNamer.cpp

Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which

2010-10-19 17:21:58 +00:00

IntegerDivision.cpp

Expansions for u/srem, using the udiv expansion. More unit tests for udiv and u/srem.

2012-09-26 01:55:01 +00:00

LCSSA.cpp

LCSSA: Try to recover compile time regressions due to SCEV updates.

2012-10-31 16:30:03 +00:00

LLVMBuild.txt

LLVMBuild: Remove trailing newline, which irked me.

2011-12-12 19:48:00 +00:00

Local.cpp

Revert the majority of the next patch in the address space series:

2012-11-01 09:14:31 +00:00

LoopSimplify.cpp

LoopSimplify: Preserve DependenceAnalysis.

2012-10-26 17:40:50 +00:00

LoopUnroll.cpp

LoopUnroll: always check for NULL LoopPassManager

2012-06-05 17:51:05 +00:00

LoopUnrollRuntime.cpp

Fix typos found by http://github.com/lyda/misspell-check

2012-06-02 10:20:22 +00:00

LowerExpectIntrinsic.cpp

Move llvm/Support/MDBuilder.h to llvm/MDBuilder.h, to live with

2012-07-15 23:26:50 +00:00

LowerInvoke.cpp

revert r166264 because the LTO build is still failing

2012-10-19 21:28:43 +00:00

LowerSwitch.cpp

Reverted r156659, due to probable performance regressions, DenseMap should be used here:

2012-07-04 05:53:05 +00:00

Makefile

…

Mem2Reg.cpp

Remove outdated references to dominance frontiers.

2011-01-18 03:53:26 +00:00

MetaRenamer.cpp

Review feedback from Duncan Sands. Alphabetize includes and simplify

2012-09-14 19:19:57 +00:00

ModuleUtils.cpp

Move llvm/Support/IRBuilder.h -> llvm/IRBuilder.h

2012-06-29 12:38:19 +00:00

PromoteMemoryToRegister.cpp

Fix typo.

2012-10-23 00:38:15 +00:00

SimplifyCFG.cpp

Only do switch-to-lookup table transformation when TargetTransformInfo

2012-11-07 21:35:12 +00:00

SimplifyIndVar.cpp

Move TargetData to DataLayout.

2012-10-08 16:38:25 +00:00

SimplifyInstructions.cpp

Move TargetData to DataLayout.

2012-10-08 16:38:25 +00:00

SimplifyLibCalls.cpp

Normalize memcmp constant folding results.

2012-11-12 14:00:45 +00:00

SSAUpdater.cpp

Fix undefined behavior (binding a reference to a dereferenced null pointer) if

2012-08-17 21:42:44 +00:00

UnifyFunctionExitNodes.cpp

[unwind removal] We no longer have 'unwind' instructions being generated, so

2012-02-06 21:16:41 +00:00

Utils.cpp

Add a pass that renames everything with metasyntatic names. This works well after using bugpoint to reduce the confusion presented by the original names, which no longer mean what they used to.

2012-09-11 02:46:18 +00:00

ValueMapper.cpp

Rename virtual table anchors from Anchor() to anchor() for consistency with the rest of the tree.

2012-09-26 06:36:36 +00:00