3 Commits

Author	SHA1	Message	Date
Justin Bogner	3b83edb037	Re-apply "[VirtRegRewriter] Avoid clobbering registers when expanding copy bundles" ... This is r334750 (which was reverted in r334754) with a fix for an uninitialized variable that was caught by msan. Original commit message: > If a copy bundle happens to involve overlapping registers, we can end > up with emitting the copies in an order that ends up clobbering some > of the subregisters. Since instructions in the copy bundle > semantically happen at the same time, this is incorrect and we need to > make sure we order the copies such that this doesn't happen. llvm-svn: 334756	2018-06-14 19:24:03 +00:00
Justin Bogner	36c7f40f20	Revert "[VirtRegRewriter] Avoid clobbering registers when expanding copy bundles" ... There's an msan failure: http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fast/builds/19549 This reverts r334750. llvm-svn: 334754	2018-06-14 19:10:57 +00:00
Justin Bogner	866d9f02be	[VirtRegRewriter] Avoid clobbering registers when expanding copy bundles ... If a copy bundle happens to involve overlapping registers, we can end up with emitting the copies in an order that ends up clobbering some of the subregisters. Since instructions in the copy bundle semantically happen at the same time, this is incorrect and we need to make sure we order the copies such that this doesn't happen. Differential Revision: https://reviews.llvm.org/D48154 llvm-svn: 334750	2018-06-14 18:32:55 +00:00