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7c5fa50875
llvm-6502/lib/Transforms/InstCombine
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Sanjay Patel 7c5fa50875 use -0.0 when creating an fneg instruction 
Backends recognize (-0.0 - X) as the canonical form for fneg
and produce better code. Eg, ppc64 with 0.0:

   lis r2, ha16(LCPI0_0)
   lfs f0, lo16(LCPI0_0)(r2)
   fsubs f1, f0, f1
   blr

vs. -0.0:

   fneg f1, f1
   blr

Differential Revision: http://reviews.llvm.org/D6723



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224583 91177308-0d34-0410-b5e6-96231b3b80d8
2014-12-19 16:44:08 +00:00
..
CMakeLists.txt
InstCombine.h Strength reduce intrinsics with overflow into regular arithmetic operations if possible. 2014-12-17 07:29:19 +00:00
InstCombineAddSub.cpp use -0.0 when creating an fneg instruction 2014-12-19 16:44:08 +00:00
InstCombineAndOrXor.cpp [InstCombine] Minor optimization for bswap with binary ops 2014-12-04 09:44:01 +00:00
InstCombineCalls.cpp Strength reduce intrinsics with overflow into regular arithmetic operations if possible. 2014-12-17 07:29:19 +00:00
InstCombineCasts.cpp More code format fix from r224133, NFC 2014-12-12 18:48:37 +00:00
InstCombineCompares.cpp Removed extra line from a comment to test first commit. NFC. 2014-11-28 10:38:18 +00:00
InstCombineLoadStoreAlloca.cpp Revert r223764 which taught instcombine about integer-based elment extraction 2014-12-09 19:21:16 +00:00
InstCombineMulDivRem.cpp InstCombine: Don't create an unused instruction 2014-11-24 16:41:13 +00:00
InstCombinePHI.cpp Update SetVector to rely on the underlying set's insert to return a pair<iterator, bool> 2014-11-19 07:49:26 +00:00
InstCombineSelect.cpp InstCombine: Restore optimizations lost in r210006 2014-11-27 07:25:21 +00:00
InstCombineShifts.cpp Make use of @llvm.assume in ValueTracking (computeKnownBits, etc.) 2014-09-07 18:57:58 +00:00
InstCombineSimplifyDemanded.cpp Add additional patterns for @llvm.assume in ValueTracking 2014-09-07 19:21:07 +00:00
InstCombineVectorOps.cpp fixed some typos 2014-07-07 22:13:58 +00:00
InstCombineWorklist.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
InstructionCombining.cpp Revert "[InstCombine] Fix visitSwitchInst to use right operand types for sub cstexpr" 2014-12-19 14:36:24 +00:00
LLVMBuild.txt
Makefile