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i965/gs: Add dummy source to prepare_channel_masks instruction.

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The generator uses its destination as a source implicitly, which breaks
some assumptions in dead code elimination. Giving the instruction a
source allows us to reason about it better.
This commit is contained in:
Matt Turner 2014-03-29 17:44:45 -07:00
parent d877c643be
commit 4dcfb92417
1 changed files with 2 additions and 1 deletions
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3
src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
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@ -408,7 +408,8 @@ vec4_gs_visitor::emit_control_data_bits()
src_reg channel_mask(this, glsl_type::uint_type);
inst = emit(SHL(dst_reg(channel_mask), one, channel));
inst->force_writemask_all = true;
emit(GS_OPCODE_PREPARE_CHANNEL_MASKS, dst_reg(channel_mask));
emit(GS_OPCODE_PREPARE_CHANNEL_MASKS, dst_reg(channel_mask),
channel_mask);
emit(GS_OPCODE_SET_CHANNEL_MASKS, mrf_reg, channel_mask);
}