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pan/bi: Add bi_make_vec_to helper

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Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8135>
This commit is contained in:
Alyssa Rosenzweig 2020-12-09 14:06:15 -05:00 • committed by Marge Bot
parent 8a6ec4a5d8
commit 4de806a803
1 changed files with 56 additions and 0 deletions
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56
src/panfrost/bifrost/bifrost_compile.c
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@ -241,6 +241,62 @@ bi_emit_ld_vary(bi_context *ctx, nir_intrinsic_instr *instr)
bi_emit(ctx, ins);
}
static void
bi_make_vec_to(bi_builder *b, bi_index final_dst,
bi_index *src,
unsigned *channel,
unsigned count,
unsigned bitsize)
{
/* If we reads our own output, we need a temporary move to allow for
* swapping. TODO: Could do a bit better for pairwise swaps of 16-bit
* vectors */
bool reads_self = false;
for (unsigned i = 0; i < count; ++i)
reads_self |= bi_is_equiv(final_dst, src[i]);
/* SSA can't read itself */
assert(!reads_self || final_dst.reg);
bi_index dst = reads_self ? bi_temp(b->shader) : final_dst;
if (bitsize == 32) {
for (unsigned i = 0; i < count; ++i) {
bi_mov_i32_to(b, bi_word(dst, i),
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);
}
} else {
unreachable("8-bit mkvec not yet supported");
}
/* Emit an explicit copy if needed */
if (!bi_is_equiv(dst, final_dst)) {
unsigned shift = (bitsize == 8) ? 2 : (bitsize == 16) ? 1 : 0;
unsigned vec = (1 << shift);
for (unsigned i = 0; i < count; i += vec) {
bi_mov_i32_to(b, bi_word(final_dst, i >> shift),
bi_word(dst, i >> shift));
}
}
}
static void
bi_emit_ld_blend_input(bi_context *ctx, nir_intrinsic_instr *instr)
{