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pan/bi: Constant fold swizzles on constants

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This lets us avoid generating SWZ instructions. Those instructions could
be constant folded but that complicates the replication analysis
introduced in the next commit.

Almost no shader-db changes.

quadwords HURT:   shaders/glmark/1-22.shader_test MESA_SHADER_FRAGMENT: 718 -> 722 (0.56%)

total quadwords in shared programs: 68169 -> 68173 (<.01%)
quadwords in affected programs: 718 -> 722 (0.56%)
helped: 0
HURT: 1

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14576>
This commit is contained in:
Alyssa Rosenzweig 2022-01-15 12:25:45 -05:00 • committed by Marge Bot
parent 62533a6e64
commit 35ff537814
1 changed files with 15 additions and 1 deletions
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16
src/panfrost/bifrost/bi_lower_swizzle.c
View file

@ -108,7 +108,21 @@ bi_lower_swizzle_16(bi_context *ctx, bi_instr *ins, unsigned src)
return;
}
/* If the instruction is scalar we can ignore the other component */
/* First, try to apply a given swizzle to a constant to clear the
* runtime swizzle. This is less heavy-handed than ignoring the
* swizzle for scalar destinations, since it maintains
* replication of the destination.
*/
if (ins->src[src].type == BI_INDEX_CONSTANT) {
ins->src[src].value = bi_apply_swizzle(ins->src[src].value,
ins->src[src].swizzle);
ins->src[src].swizzle = BI_SWIZZLE_H01;
return;
}
/* Even if the source does not replicate, if the consuming instruction
* produces a 16-bit scalar, we can ignore the other component.
*/
if (ins->dest[0].swizzle == BI_SWIZZLE_H00 &&
ins->src[src].swizzle == BI_SWIZZLE_H00)
{