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	6e32b46b1d	[ConstantHoisting] avoid hang/crash from unreachable blocks (PR40930) ... I'm not too familiar with this pass, so there might be a better solution, but this appears to fix the degenerate: PR40930 PR40931 PR40932 PR40934 ...without affecting any real-world code. As we've seen in several other passes, when we have unreachable blocks, they can contain semi-bogus IR and/or cause unexpected conditions. We would not typically expect these patterns to make it this far, but we have to guard against them anyway. llvm-svn: 355337	2019-03-04 20:57:14 +00:00
Matthias Braun	d6131c9633	X86/TargetTransformInfo: Report div/rem constant immediate costs as TCC_Free ... DIV/REM by constants should always be expanded into mul/shift/etc. patterns. Unfortunately the ConstantHoisting pass runs too early at a point where the pattern isn't expanded yet. However after ConstantHoisting hoisted some immediate the result may not expand anymore. Also the hoisting typically doesn't make sense because it operates on immediates that will change completely during the expansion. Report DIV/REM as TCC_Free so ConstantHoisting will not touch them. Differential Revision: https://reviews.llvm.org/D53174 llvm-svn: 344315	2018-10-11 23:14:35 +00:00