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i965/vec4: Only zero out unused message components when there are any.

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Otherwise, coordinates with four components would result in a MOV
with a destination writemask that has no channels enabled:

mov(8) g115<1>.F 0D { align16 WE_normal NoDDChk 1Q };

At best, this is stupid: we emit code that shouldn't do anything.
Worse, it apparently causes GPU hangs (observable with Chris's
textureGather test on CubeArrays.)

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Cc: Chris Forbes <chrisf@ijw.co.nz>
Cc: mesa-stable@lists.freedesktop.org
This commit is contained in:
Kenneth Graunke 2013-09-09 11:11:03 -07:00
parent 2924b5f73b
commit 6c3db2167c
1 changed files with 4 additions and 2 deletions
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6
src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
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@ -2245,8 +2245,10 @@ vec4_visitor::visit(ir_texture *ir)
emit(MOV(dst_reg(MRF, param_base, ir->coordinate->type, coord_mask),
coordinate));
}
emit(MOV(dst_reg(MRF, param_base, ir->coordinate->type, zero_mask),
src_reg(0)));
if (zero_mask != 0) {
emit(MOV(dst_reg(MRF, param_base, ir->coordinate->type, zero_mask),
src_reg(0)));
}
/* Load the shadow comparitor */
if (ir->shadow_comparitor && ir->op != ir_txd) {
emit(MOV(dst_reg(MRF, param_base + 1, ir->shadow_comparitor->type,