llvm-project

Commit Graph

Author	SHA1	Message	Date
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

Author

SHA1

Message

Date

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

2 Commits