Arnold Schwaighofer e79d92c592 PatternMatch: Matcher for (un)ordered floating point min/max ... Add support for matching 'ordered' and 'unordered' floating point min/max constructs. In LLVM we can express min/max functions as a combination of compare and select. We have support for matching such constructs for integers but not for floating point. In floating point math there is no total order because of the presence of 'NaN'. Therefore, we have to be careful to preserve the original fcmp semantics when interpreting floating point compare select combinations as a minimum or maximum function. The resulting 'ordered/unordered' floating point maximum function has to select the same value as the select/fcmp combination it is based on. ordered_max(x,y) = max(x,y) iff x and y are not NaN, y otherwise unordered_max(x,y) = max(x,y) iff x and y are not NaN, x otherwise ordered_min(x,y) = min(x,y) iff x and y are not NaN, y otherwise unordered_min(x,y) = min(x,y) iff x and y are not NaN, x otherwise This matches the behavior of the underlying select(fcmp(olt/ult/.., L, R), L, R) construct. Any code using this predicate has to preserve this semantics. A follow-up patch will use this to implement floating point min/max reductions in the vectorizer. radar://13723044 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181143 91177308-0d34-0410-b5e6-96231b3b80d8		2013-05-05 01:54:46 +00:00
..
AttributesTest.cpp	Fix test to not use the AttributeSet's AttributeWithIndex creation method.	2013-01-27 03:39:10 +00:00
CMakeLists.txt	Fix a disconcerting bug in Value::isUsedInBasicBlock, which gave wrong answers for blocks larger than 3 instrs.	2013-04-12 08:33:11 +00:00
ConstantsTest.cpp	llvm/unittests: Use OwningPtr to fix --vg-leak.	2013-01-23 08:33:13 +00:00
DominatorTreeTest.cpp	llvm/unittests: Use OwningPtr to fix --vg-leak.	2013-01-23 08:33:13 +00:00
InstructionsTest.cpp	Change GetPointerBaseWithConstantOffset's DataLayout argument from a	2013-01-31 02:00:45 +00:00
IRBuilderTest.cpp	IRTests/IRBuilderTest.cpp: GetIntTy: Delete DL at yourself since it is not linked.	2013-01-23 08:31:28 +00:00
Makefile
MDBuilderTest.cpp
MetadataTest.cpp
PassManagerTest.cpp
PatternMatch.cpp	PatternMatch: Matcher for (un)ordered floating point min/max	2013-05-05 01:54:46 +00:00
TypeBuilderTest.cpp
TypesTest.cpp
ValueMapTest.cpp
ValueTest.cpp	Fix a disconcerting bug in Value::isUsedInBasicBlock, which gave wrong answers for blocks larger than 3 instrs.	2013-04-12 08:33:11 +00:00
VerifierTest.cpp
WaymarkTest.cpp	IRTests/WaymarkTest.cpp: Fix in --vg-leak.	2013-01-23 08:33:05 +00:00