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i965/fs: Don't set flag_subreg_nr = 1 on predicated FB write setup. 

On Haswell, we implement "discard" via predicated SEND messages, using
f0.1 instead of f0.0.  To accomplish this, we set inst->flag_subreg to 1
on the FS_OPCODE_FB_WRITE.

Most instructions using fs_inst::flag_subreg expand to a single assembly
instruction.  However, FS_OPCODE_FB_WRITE can generate several MOVs for
setting up header information.  We don't want to set flag_subreg on
those, so override the default state back to 0.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
This commit is contained in:
Kenneth Graunke 2014-08-10 16:15:51 -07:00
parent 2e180e4c09
commit efc818e3a4
1 changed files with 1 additions and 0 deletions
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src/mesa/drivers/dri/i965/brw_fs_generator.cpp
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@ -154,6 +154,7 @@ fs_generator::generate_fb_write(fs_inst *inst)
brw_set_default_mask_control(p, BRW_MASK_DISABLE);
brw_set_default_predicate_control(p, BRW_PREDICATE_NONE);
brw_set_default_compression_control(p, BRW_COMPRESSION_NONE);
brw_set_default_flag_reg(p, 0, 0);
/* On HSW, the GPU will use the predicate on SENDC, unless the header is
* present.