Sanjay Patel 187c215247 [InstCombine] canonicalize min/max constant to select's false value ...

This is a first step towards canonicalization and improved folding/codegen
for integer min/max as discussed here:
http://lists.llvm.org/pipermail/llvm-dev/2016-November/106868.html

Here, we're just matching the simplest min/max patterns and adjusting the
icmp predicate while swapping the select operands.

I've included FIXME tests in test/Transforms/InstCombine/select_meta.ll
so it's easier to see how this might be extended (corresponds to the TODO
comment in the code). That's also why I'm using matchSelectPattern()
rather than a simpler check; once the backend is patched, we can just 
remove some of the restrictions to allow the obfuscated min/max patterns
in the FIXME tests to be matched.

Differential Revision: https://reviews.llvm.org/D26525

llvm-svn: 287585

2016-11-21 22:04:14 +00:00

..

CMakeLists.txt

[CMake] NFC. Updating CMake dependency specifications

2016-11-17 04:36:50 +00:00

InstCombineAddSub.cpp

[InstCombine] use m_APInt to allow sub with constant folds for splat vectors

2016-10-14 16:31:54 +00:00

InstCombineAndOrXor.cpp

[InstCombine] add helper function for folding {and,or,xor} (cast X), C ; NFCI

2016-09-12 00:16:23 +00:00

InstCombineCalls.cpp

[InstCombine][AVX-512] Teach InstCombineCalls how to handle the intrinsics for variable shift with 16-bit elements.

2016-11-18 06:04:33 +00:00

InstCombineCasts.cpp

[InstCombine] clean up commonCastTransforms; NFC

2016-10-26 14:52:35 +00:00

InstCombineCompares.cpp

[InstCombine] Fold nuw left-shifts in ugt/ule comparisons.

2016-11-01 19:19:29 +00:00

InstCombineInternal.h

[InstCombine] handle simple vector integer constants in IsFreeToInvert

2016-10-27 17:30:50 +00:00

InstCombineLoadStoreAlloca.cpp

Analysis: Move llvm::getConstantRangeFromMetadata to IR library.

2016-10-21 19:59:26 +00:00

InstCombineMulDivRem.cpp

fix formatting; NFC

2016-11-21 21:48:36 +00:00

InstCombinePHI.cpp

Use the range variant of find/find_if instead of unpacking begin/end

2016-08-12 03:55:06 +00:00

InstCombineSelect.cpp

[InstCombine] canonicalize min/max constant to select's false value

2016-11-21 22:04:14 +00:00

InstCombineShifts.cpp

[InstCombine] Folding of shifts by the sum of positive values

2016-11-01 15:40:30 +00:00

InstCombineSimplifyDemanded.cpp

[X86] Remove the scalar intrinsics for fadd/fsub/fdiv/fmul

2016-11-16 05:24:10 +00:00

InstCombineVectorOps.cpp

[InstCombine] avoid infinite loop from shuffle-extract-insert sequence (PR30923)

2016-11-10 00:15:14 +00:00

InstructionCombining.cpp

Fix spelling mistakes in Transforms comments. NFC.

2016-11-20 13:19:49 +00:00

LLVMBuild.txt

Update libdeps since TLI was moved from Target to Analysis in r226078.

2015-01-15 05:21:00 +00:00