Sanjay Patel a488c7879e [InstCombine] reduce signbit test of logic ops to cmp with zero ... This is the pattern from the description of: https://llvm.org/PR50816 There might be a way to generalize this to a smaller or more generic pattern, but I have not found it yet. https://alive2.llvm.org/ce/z/ShzJoF define i1 @src(i8 %x) { %add = add i8 %x, -1 %xor = xor i8 %x, -1 %and = and i8 %add, %xor %r = icmp slt i8 %and, 0 ret i1 %r } define i1 @tgt(i8 %x) { %r = icmp eq i8 %x, 0 ret i1 %r }		2021-07-12 09:01:26 -04:00
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CMakeLists.txt	llvmbuildectomy - replace llvm-build by plain cmake	2020-11-13 10:35:24 +01:00
InstCombineAddSub.cpp	[InstCombine] fix nsz (fast-math) propagation from fneg-of-select	2021-06-08 17:04:30 -04:00
InstCombineAndOrXor.cpp	[InstCombine] InstCombinerImpl::visitOr - enable bitreverse matching	2021-05-15 13:39:09 +01:00
InstCombineAtomicRMW.cpp	Add missing namespace closure comments. NFCI.	2020-09-23 16:19:25 +01:00
InstCombineCalls.cpp	[InstCombine][NFC]Use only `replaceInstUsesWith`, NFC.	2021-07-08 13:58:30 -07:00
InstCombineCasts.cpp	[InstCombine] Eliminate casts to optimize ctlz operation	2021-06-23 11:19:12 -04:00
InstCombineCompares.cpp	[InstCombine] reduce signbit test of logic ops to cmp with zero	2021-07-12 09:01:26 -04:00
InstCombineInternal.h	[InstCombine] Add optimization to prevent poison from being propagated.	2021-07-11 12:40:43 +09:00
InstCombineLoadStoreAlloca.cpp	[InstCombine] Gracefully handle an alloca outside the alloca-AS	2021-06-29 09:38:13 -05:00
InstCombineMulDivRem.cpp	[InstCombine] Fold (sext bool X) * (sext bool X) to zext (and X, X)	2021-06-18 16:28:06 +07:00
InstCombineNegator.cpp	[Transforms] Use range-based for loops (NFC)	2021-02-08 22:33:53 -08:00
InstCombinePHI.cpp	[InstCombine] Don't combine PHI before catchswitch	2021-07-02 12:10:24 -07:00
InstCombineSelect.cpp	[InstCombine] avoid infinite loops with select folds of constant expressions	2021-06-20 09:46:25 -04:00
InstCombineShifts.cpp	[InstCombine] fold shift-of-srem-by-2 to mask+shift	2021-04-20 17:10:16 -04:00
InstCombineSimplifyDemanded.cpp	[InsCombine] Fix a few remaining vec transforms to use poison instead of undef	2021-05-31 18:47:09 +09:00
InstCombineVectorOps.cpp	[NFC] Fix a few whitespace issues and typos.	2021-07-04 11:49:58 +01:00
InstructionCombining.cpp	[InstCombine] Add optimization to prevent poison from being propagated.	2021-07-11 12:40:43 +09:00