4 Commits

Author	SHA1	Message	Date
Simon Pilgrim	5c3c9707c3	[X86][SSE] Add support for (V)PMOVSX* constant folding ... We already have (V)PMOVZX* combining support, this is the beginning of handling (V)PMOVSX* similarly - other combines in combineVSZext can be generalized in future patches. This unearthed an interesting bug in that we were generating illegal build vectors on 32-bit targets - it was proving difficult to create a test for it from PMOVZX, but it fired immediately with PMOVSX. I've created a more general form of the existing getConstVector to handle these cases - ideally this should be handled in non-target-specific code but I couldn't find an equivalent. Differential Revision: https://reviews.llvm.org/D25874 llvm-svn: 285072	2016-10-25 14:29:25 +00:00
Simon Pilgrim	372e916a3f	[X86][SSE] Regenerated sext/zext constant folding tests and added i686 tests ... llvm-svn: 284837	2016-10-21 16:22:16 +00:00
Simon Pilgrim	32b25549fa	Regenerate vector sext/zext constant folding tests. ... llvm-svn: 259405	2016-02-01 21:01:29 +00:00
Andrea Di Biagio	f09a357765	[DAGCombiner] Teach how to fold sext/aext/zext of constant build vectors. ... This patch teaches the DAGCombiner how to fold a sext/aext/zext dag node when the operand in input is a build vector of constants (or UNDEFs). The inability to fold a sext/zext of a constant build_vector was the root cause of some pcg bugs affecting vselect expansion on x86-64 with AVX support. Before this change, the DAGCombiner only knew how to fold a sext/zext/aext of a ConstantSDNode. llvm-svn: 200234	2014-01-27 18:45:30 +00:00