The 8888 splats the first component to all the channels, so later channels
packing from it can be skipped.
total instructions in shared programs: 98170 -> 98168 (-0.00%)
instructions in affected programs: 257 -> 255 (-0.78%)
---
src/gallium/drivers/vc4/vc4_program.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/src/gallium/drivers/vc4/vc4_program.c
b/src/gallium/drivers/vc4/vc4_program.c
index 13c4721..ab2f885 100644
--- a/src/gallium/drivers/vc4/vc4_program.c
+++ b/src/gallium/drivers/vc4/vc4_program.c
@@ -840,13 +840,17 @@ ntq_emit_alu(struct vc4_compile *c, nir_alu_instr *instr)
if (instr->op == nir_op_pack_unorm_4x8) {
struct qreg result;
+ struct qreg src0;
for (int i = 0; i < 4; i++) {
struct qreg src = ntq_get_src(c, instr->src[0].src,
instr->src[0].swizzle[i]);
- if (i == 0)
+ if (i == 0) {
+ src0 = src;
result = qir_PACK_8888_F(c, src);
- else
- result = qir_PACK_8_F(c, result, src, i);
+ } else {
+ if (memcmp(&src, &src0, sizeof(src)) != 0)
+ result = qir_PACK_8_F(c, result, src,
i);
+ }
}
struct qreg *dest = ntq_get_dest(c, &instr->dest.dest);
*dest = result;
--
2.1.4
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