llvm-project/llvm/lib/Transforms/Utils
Meador Inge b3e91f6ae0 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.

llvm-svn: 167726
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
CMakeLists.txt Implement new LibCallSimplifier class 2012-10-13 16:45:24 +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
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
SSAUpdater.cpp Fix undefined behavior (binding a reference to a dereferenced null pointer) if 2012-08-17 21:42:44 +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
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