[Mesa-dev] [PATCH] i965: Fix INTEL_DEBUG=shader_time for fragment shaders with discards.

Eric Anholt eric at anholt.net
Thu Mar 28 13:43:40 PDT 2013

Kenneth Graunke <kenneth at whitecape.org> writes:

> "discard" instructions generate HALT instructions which jump to a final
> HALT near the end of the shader.  Previously, fs_generator created this
> final jump target when it saw the first FS_OPCODE_FB_WRITE, causing it
> to jump right before the FB write epilogue.  This is normally good.
> However, INTEL_DEBUG=shader_time also has an epilogue section which
> records the final timestamp.  The frontend emits IR for this just before
> FS_OPCODE_FB_WRITE.  Unfortunately, this led to the following ordering:

Wow, that changes timings...

Reviewed-by: Eric Anholt <eric at anholt.net>
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