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Author SHA1 Message Date
Antonio Maiorano 11d09f2fe7 HLSL: force FXC to never unroll loops 
Emit the "[loop]" attribute on "for" and "while" so that FXC does not
attempt to unroll them. This is to work around an FXC bug where it fails
to unroll loops with gradient operations.

FXC ostensibly unrolls such loops because gradient operations require
uniform control flow, and loops that have varying iterations may
possibly not be uniform. Tint will eventually validate that control flow
is indeed uniform, so forcing FXC to avoid unrolling in these cases
should be fine.

Bug: tint:1112
Change-Id: I10077f8b62fbbb230a0003f3864c75a8fe0e1d18
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/69880
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Antonio Maiorano <amaiorano@google.com>
 2021-11-18 13:50:12 +00:00
Ben Clayton 1b03f0a07a reader/wgsl: Generate ForLoopStatements 
Instead of LoopStatements.

Update the writers to handle these.

Fixed: tint:952
Change-Id: Ibef66e133224810efc28c224d910b5e21f71f8d6
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/57203
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: James Price <jrprice@google.com>
 2021-07-08 21:23:33 +00:00
Ben Clayton 2ba8315b02 [test]: Add some test cases for for-loops 
Bug: tint:952
Change-Id: I156e29a74ce3942a39f25dc5bfb3d5467e206fce
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/57201
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: James Price <jrprice@google.com>
 2021-07-08 10:00:17 +00:00