4 Commits

Author	SHA1	Message	Date
Eric Christopher	cee313d288	Revert "Temporarily Revert "Add basic loop fusion pass."" ... The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552	2019-04-17 04:52:47 +00:00
Eric Christopher	a863435128	Temporarily Revert "Add basic loop fusion pass." ... As it's causing some bot failures (and per request from kbarton). This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda. llvm-svn: 358546	2019-04-17 02:12:23 +00:00
Sanjay Patel	97d1bc4454	[InstCombine] eliminate commuted select-shuffles + binop (PR41304) ... If we have a commutable vector binop with inverted select-shuffles, we don't care about the order of the operands in each vector lane: LHS = shuffle V1, V2, <0, 5, 6, 3> RHS = shuffle V2, V1, <0, 5, 6, 3> LHS + RHS --> <V1[0]+V2[0], V2[1]+V1[1], V2[2]+V1[2], V1[3]+V2[3]> --> V1 + V2 PR41304: https://bugs.llvm.org/show_bug.cgi?id=41304 ...is currently titled as an SLP enhancement, but at least for the given example, we can reduce that in instcombine because we are just eliminating shuffles. As noted in the TODO, this could be generalized, but I haven't thought through those patterns completely, so this is limited to what appears to be always safe. Differential Revision: https://reviews.llvm.org/D60048 llvm-svn: 357382	2019-04-01 13:36:40 +00:00
Sanjay Patel	7ac1186b58	[InstCombine] add tests for inverted select-shuffles + binop (PR41304); NFC ... llvm-svn: 357368	2019-03-31 15:45:47 +00:00