Sanjay Patel 782c5d6f79 [InstCombine] fold min/max tree with common operand (PR35717) ... There is precedence for factorization transforms in instcombine for FP ops with fast-math. We also have similar logic in foldSPFofSPF(). It would take more work to add this to reassociate because that's specialized for binops, and min/max are not binops (or even single instructions). Also, I don't have evidence that larger min/max trees than this exist in real code, but if we find that's true, we might want to reorganize where/how we do this optimization. In the motivating example from https://bugs.llvm.org/show_bug.cgi?id=35717 , we have: int test(int xc, int xm, int xy) { int xk; if (xc < xm) xk = xc < xy ? xc : xy; else xk = xm < xy ? xm : xy; return xk; } This patch solves that problem because we recognize more min/max patterns after rL321672 https://rise4fun.com/Alive/Qjne https://rise4fun.com/Alive/3yg Differential Revision: https://reviews.llvm.org/D41603 llvm-svn: 321998		2018-01-08 15:05:34 +00:00
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CMakeLists.txt
InstCombineAddSub.cpp	[InstCombine] canonicalize constant-minus-boolean to select-of-constants	2017-12-06 21:22:57 +00:00
InstCombineAndOrXor.cpp	[InstCombine] canonicalize shifty abs(): ashr+add+xor --> cmp+neg+sel	2017-12-16 16:41:17 +00:00
InstCombineCalls.cpp	[InstCombine] Check for isa<Instruction> before using cast<>	2017-12-28 09:35:35 +00:00
InstCombineCasts.cpp	[InstCombine] include 'sub' in the list of narrow-able binops	2017-11-16 14:40:51 +00:00
InstCombineCompares.cpp	[InstCombine] safely create a constant of the right type (PR35794)	2018-01-04 14:31:56 +00:00
InstCombineInternal.h	Create instruction classes for identifying any atomicity of memory intrinsic. (NFC)	2017-10-30 19:51:48 +00:00
InstCombineLoadStoreAlloca.cpp	Remove redundant includes from lib/Transforms.	2017-12-13 21:31:01 +00:00
InstCombineMulDivRem.cpp	[InstCombine] Missed optimization in math expression: squashing sqrt functions	2018-01-02 05:58:11 +00:00
InstCombinePHI.cpp	Remove redundant includes from lib/Transforms.	2017-12-13 21:31:01 +00:00
InstCombineSelect.cpp	[InstCombine] fold min/max tree with common operand (PR35717)	2018-01-08 15:05:34 +00:00
InstCombineShifts.cpp	[InstCombine] Check for out of range shift values using APInt before calling getZExtValue	2018-01-03 18:28:20 +00:00
InstCombineSimplifyDemanded.cpp	[InstCombine] Fix SimplifyDemandedUseBits SHL handling (PR35515)	2017-12-09 23:42:56 +00:00
InstCombineVectorOps.cpp	[InstCombine] Gracefully handle out of range extractelement indices	2017-12-27 12:00:18 +00:00
InstructionCombining.cpp	[PM][InstCombine] fixing omission of AliasAnalysis in new-pass-manager's version of InstCombine	2017-12-14 10:36:31 +00:00
LLVMBuild.txt