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vc4: Take advantage of the 8888 pack function in pack_unorm_4x8.

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One instruction instead of four, and it turns out you do this a lot for
the Over operator.

total uniforms in shared programs: 32168 -> 32087 (-0.25%)
uniforms in affected programs:     318 -> 237 (-25.47%)
total instructions in shared programs: 89830 -> 89472 (-0.40%)
instructions in affected programs:     6434 -> 6076 (-5.56%)
This commit is contained in:
Eric Anholt 2015-10-24 17:04:49 -07:00
parent f09ed63f43
commit ae1d3322cc
1 changed files with 14 additions and 0 deletions
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14
src/gallium/drivers/vc4/vc4_program.c
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@ -738,6 +738,20 @@ ntq_emit_pack_unorm_4x8(struct vc4_compile *c, nir_alu_instr *instr)
vec4 = nir_instr_as_alu(instr->src[0].src.ssa->parent_instr);
}
/* If the pack is replicating the same channel 4 times, use the 8888
* pack flag. This is common for blending using the alpha
* channel.
*/
if (instr->src[0].swizzle[0] == instr->src[0].swizzle[1] &&
instr->src[0].swizzle[0] == instr->src[0].swizzle[2] &&
instr->src[0].swizzle[0] == instr->src[0].swizzle[3]) {
struct qreg *dest = ntq_get_dest(c, &instr->dest.dest);
*dest = qir_PACK_8888_F(c,
ntq_get_src(c, instr->src[0].src,
instr->src[0].swizzle[0]));
return;
}
for (int i = 0; i < 4; i++) {
int swiz = instr->src[0].swizzle[i];
struct qreg src;