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4 Commits

Author SHA1 Message Date
Steven Perron
9ba0879ddf Improve Vector DCE 
Track live scalars in VDCE as if they were single element vectors.

Handle the extended instructions for GLSL in VDCE.

Handle composite construct instructions in VDCE.
 2018-04-30 11:55:50 -04:00
Steven Perron
a00a0a09ae Revert "Improvements to vector dce." 
This reverts commit 2813722993.

A regression was found.  Undoing the change until it is fixed.
 2018-04-27 10:33:19 -04:00
Steven Perron
2813722993 Improvements to vector dce. 
Track live scalars in VDCE as if they were single element vectors.

Handle the extended instructions for GLSL in VDCE.

Handle composite construct instructions in VDCE.

Fixes #1511.
 2018-04-26 11:07:48 -04:00
Steven Perron
2c0ce87210
Vector DCE (#1512) 
Introduce a pass that does a DCE type analysis for vector elements
instead of the whole vector as a single element.

It will then rewrite instructions that are not used with something else.
For example, an instruction whose value are not used, even though it is
referenced, is replaced with an OpUndef.
 2018-04-23 11:13:07 -04:00