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intel/brw: Mark FIND[_LAST]_LIVE_CHANNEL as not writing the flag

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brw_lower_find_live_channel doesn't actually write a flag register,
but elk_find_live_channel notes that the flag was used on Gfx7.

This allows more CSE on FIND[_LAST]_LIVE_CHANNEL.

shader-db and fossil-db on Alchemist show minor reductions in cycles
and instruction count, a few minor increases, but it doesn't seem to
be a large effect in either direction.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27862>
This commit is contained in:
Kenneth Graunke 2024-02-27 02:02:24 -08:00
parent 2ece531e33
commit 63d2aa4eb6
1 changed files with 1 additions and 3 deletions
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4
src/intel/compiler/brw_fs.cpp
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@ -994,9 +994,7 @@ fs_inst::flags_written(const intel_device_info *devinfo) const
opcode != BRW_OPCODE_IF &&
opcode != BRW_OPCODE_WHILE)) {
return brw_fs_flag_mask(this, 1);
} else if (opcode == SHADER_OPCODE_FIND_LIVE_CHANNEL ||
opcode == SHADER_OPCODE_FIND_LAST_LIVE_CHANNEL ||
opcode == FS_OPCODE_LOAD_LIVE_CHANNELS) {
} else if (opcode == FS_OPCODE_LOAD_LIVE_CHANNELS) {
return brw_fs_flag_mask(this, 32);
} else {
return brw_fs_flag_mask(dst, size_written);