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llvm-project/llvm/lib/Transforms/InstCombine
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Sanjay Patel f61a08fbf1 [InstCombine] transform masking off of an FP sign bit into a fabs() intrinsic call (PR24886) 
This is a partial fix for PR24886:
https://llvm.org/bugs/show_bug.cgi?id=24886

Without this IR transform, the backend (x86 at least) was producing inefficient code.

This patch is making 2 assumptions:

    1. The canonical form of a fabs() operation is, in fact, the LLVM fabs() intrinsic.
    2. The high bit of an FP value is always the sign bit; as noted in the bug report, this isn't specified by the LangRef.

Differential Revision: http://reviews.llvm.org/D13076

llvm-svn: 249702
 		2015-10-08 17:09:31 +00:00
..
CMakeLists.txt Use ADDITIONAL_HEADER_DIRS in all LLVM CMake projects. 2015-02-11 03:28:02 +00:00
InstCombineAddSub.cpp don't repeat function names in comments; NFC 2015-09-09 15:24:36 +00:00
InstCombineAndOrXor.cpp [InstCombine] transform masking off of an FP sign bit into a fabs() intrinsic call (PR24886) 2015-10-08 17:09:31 +00:00
InstCombineCalls.cpp [InstCombine] Remove trivially empty lifetime start/end ranges. 2015-10-01 14:54:31 +00:00
InstCombineCasts.cpp There is a trunc(lshr (zext A), Cst) optimization in InstCombineCasts that 2015-09-10 11:31:20 +00:00
InstCombineCompares.cpp InstCombine: Fold comparisons between unguessable allocas and other pointers 2015-10-07 00:20:07 +00:00
InstCombineInternal.h InstCombine: Fold comparisons between unguessable allocas and other pointers 2015-10-07 00:20:07 +00:00
InstCombineLoadStoreAlloca.cpp inariant.group handling in GVN 2015-10-02 22:12:22 +00:00
InstCombineMulDivRem.cpp don't repeat function names in comments; NFC 2015-09-09 15:24:36 +00:00
InstCombinePHI.cpp [InstCombine] fold zexts and constants into a phi (PR24766) 2015-09-27 20:34:31 +00:00
InstCombineSelect.cpp don't repeat function names in comments; NFC 2015-09-09 15:24:36 +00:00
InstCombineShifts.cpp Convert PHI getIncomingValue() to foreach over incoming_values(). NFC. 2015-05-12 20:05:31 +00:00
InstCombineSimplifyDemanded.cpp [InstCombine] Teach SimplifyDemandedVectorElts how to handle ConstantVector select masks with ConstantExpr elements (PR24922) 2015-10-06 10:34:53 +00:00
InstCombineVectorOps.cpp don't repeat function names in comments; NFC 2015-09-09 15:24:36 +00:00
InstructionCombining.cpp [WinEH] Recognize CoreCLR personality function 2015-10-06 20:28:16 +00:00
LLVMBuild.txt Update libdeps since TLI was moved from Target to Analysis in r226078. 2015-01-15 05:21:00 +00:00
Makefile
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