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	e5bc441791	[InstCombine] don't change the size of a select if it would mismatch its condition operands' sizes ... Don't always: cast (select (cmp x, y), z, C) --> select (cmp x, y), (cast z), C' This is something that came up as far back as D26556, and I lost track of it. I suspect that this transform is part of the underlying problem that is inspiring some of the recent proposals that seek to match larger patterns that include a cast op. Even if that's not true, this transform causes problems for codegen (particularly with vector types). A transform to actively match the size of cmp and select operand sizes should follow. This patch just removes the harmful canonicalization in the other direction. Differential Revision: https://reviews.llvm.org/D47163 llvm-svn: 333611	2018-05-31 00:16:58 +00:00
Sanjay Patel	94b1f846b2	[InstCombine] add tests for cast-of-select; NFC ... In all cases, we're pulling the cast above the select. That's not a good canonicalization if we're creating a select that then mismatches the operand size of its condition. llvm-svn: 332883	2018-05-21 20:23:58 +00:00