Fix simplification of switch statements with casts.
The original code assumed that the switch value and case value would
both be IntLiterals, and asserted if this were not true. However, in
sufficiently complicated cases, the switch value can sometimes be a
Constructor containing a scalar.
It's possible that there's a fix to constant propagation which would
flatten out this Constructor to just a scalar, but that has eluded me
for today, and this approach does seem to solve the issue. (Also, it's
surprising that the optimizer does not notice that it can simplify
`half4(1.0, 2.0, 3.0, 4.0).yyyy`.)
Change-Id: Id490b15c724dd174c448665a19242cc80cdce213
Bug: skia:10623
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/311636
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
2 files changed