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pan/bi: Optimize MKVEC.v2i16 generation

Browse source 
Prefer SWZ.v2i16 in cases where that's possible, it will be easier to
optimize later.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10065>
This commit is contained in:
Alyssa Rosenzweig 2020-12-31 16:04:38 -05:00 • committed by Marge Bot
parent f9bc168bd3
commit e3e2c5b594
1 changed files with 28 additions and 14 deletions
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42
src/panfrost/bifrost/bifrost_compile.c
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@ -263,6 +263,33 @@ bi_emit_load_vary(bi_builder *b, nir_intrinsic_instr *instr)
}
}
static void
bi_make_vec16_to(bi_builder *b, bi_index dst, bi_index *src,
unsigned *channel, unsigned count)
{
for (unsigned i = 0; i < count; i += 2) {
bool next = (i + 1) < count;
unsigned chan = channel ? channel[i] : 0;
unsigned nextc = next && channel ? channel[i + 1] : 0;
bi_index w0 = bi_word(src[i], chan >> 1);
bi_index w1 = next ? bi_word(src[i + 1], nextc >> 1) : bi_zero();
bi_index h0 = bi_half(w0, chan & 1);
bi_index h1 = bi_half(w1, nextc & 1);
bi_index to = bi_word(dst, i >> 1);
if (bi_is_word_equiv(w0, w1) && (chan & 1) == 0 && ((nextc & 1) == 1))
bi_mov_i32_to(b, to, w0);
else if (bi_is_word_equiv(w0, w1))
bi_swz_v2i16_to(b, to, bi_swz_16(w0, chan & 1, nextc & 1));
else
bi_mkvec_v2i16_to(b, to, h0, h1);
}
}
static void
bi_make_vec_to(bi_builder *b, bi_index final_dst,
bi_index *src,
@ -289,20 +316,7 @@ bi_make_vec_to(bi_builder *b, bi_index final_dst,
bi_word(src[i], channel ? channel[i] : 0));
}
} else if (bitsize == 16) {
for (unsigned i = 0; i < count; i += 2) {
unsigned chan = channel ? channel[i] : 0;
bi_index w0 = bi_half(bi_word(src[i], chan >> 1), chan & 1);
bi_index w1 = bi_imm_u16(0);
/* Don't read out of bound for vec3 */
if ((i + 1) < count) {
unsigned nextc = channel ? channel[i + 1] : 0;
w1 = bi_half(bi_word(src[i + 1], nextc >> 1), nextc & 1);
}
bi_mkvec_v2i16_to(b, bi_word(dst, i >> 1), w0, w1);
}
bi_make_vec16_to(b, dst, src, channel, count);
} else {
unreachable("8-bit mkvec not yet supported");
}