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| author | Francisco Jerez <currojerez@riseup.net> | 2015-04-23 14:42:53 +0300 |
|---|---|---|
| committer | Francisco Jerez <currojerez@riseup.net> | 2015-05-04 17:44:17 +0300 |
| commit | 715bc6d8b16a0bbdc17fe1e1e46b88a679bf312b (patch) | |
| tree | 442dd3d1523c4eb84b1e01e89b1e43aab3f5789d /src/mesa/drivers/dri/i965/brw_defines.h | |
| parent | f2fad0dc80627e853eea558498f18a9fa769992e (diff) | |
| download | external_mesa3d-715bc6d8b16a0bbdc17fe1e1e46b88a679bf312b.zip external_mesa3d-715bc6d8b16a0bbdc17fe1e1e46b88a679bf312b.tar.gz external_mesa3d-715bc6d8b16a0bbdc17fe1e1e46b88a679bf312b.tar.bz2 | |
i965: Introduce the FIND_LIVE_CHANNEL pseudo-opcode.
This instruction calculates the index of an arbitrary channel enabled
in the current execution mask. It's expected to be used as input for
the BROADCAST opcode, but it's implemented as a separate instruction
rather than being baked into BROADCAST because FIND_LIVE_CHANNEL has
no dependencies so it can always be CSE'ed with other instances of the
same instruction within a basic block.
v2: Whitespace fixes.
Reviewed-by: Matt Turner <mattst88@gmail.com>
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_defines.h')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_defines.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_defines.h b/src/mesa/drivers/dri/i965/brw_defines.h index 5072e68..7b5dd45 100644 --- a/src/mesa/drivers/dri/i965/brw_defines.h +++ b/src/mesa/drivers/dri/i965/brw_defines.h @@ -919,6 +919,14 @@ enum opcode { SHADER_OPCODE_URB_WRITE_SIMD8, /** + * Return the index of an arbitrary live channel (i.e. one of the channels + * enabled in the current execution mask) and assign it to the first + * component of the destination. Expected to be used as input for the + * BROADCAST pseudo-opcode. + */ + SHADER_OPCODE_FIND_LIVE_CHANNEL, + + /** * Pick the channel from its first source register given by the index * specified as second source. Useful for variable indexing of surfaces. */ |