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compiler/spirv: implement 16-bit bitcasts 

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Iago Toral Quiroga 2018-04-17 10:22:43 +02:00
parent 2d648e5ba3
commit 1dacb56279
1 changed files with 22 additions and 9 deletions
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31
src/compiler/spirv/vtn_alu.c
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@ -251,10 +251,17 @@ vtn_handle_bitcast(struct vtn_builder *b, struct vtn_ssa_value *dest,
vtn_assert(src_bit_size % dest_bit_size == 0);
unsigned divisor = src_bit_size / dest_bit_size;
for (unsigned comp = 0; comp < src_components; comp++) {
vtn_assert(src_bit_size == 64);
vtn_assert(dest_bit_size == 32);
nir_ssa_def *split =
nir_unpack_64_2x32(&b->nb, nir_channel(&b->nb, src, comp));
nir_ssa_def *split;
if (src_bit_size == 64) {
assert(dest_bit_size == 32 || dest_bit_size == 16);
split = dest_bit_size == 32 ?
nir_unpack_64_2x32(&b->nb, nir_channel(&b->nb, src, comp)) :
nir_unpack_64_4x16(&b->nb, nir_channel(&b->nb, src, comp));
} else {
vtn_assert(src_bit_size == 32);
vtn_assert(dest_bit_size == 16);
split = nir_unpack_32_2x16(&b->nb, nir_channel(&b->nb, src, comp));
}
for (unsigned i = 0; i < divisor; i++)
dest_chan[divisor * comp + i] = nir_channel(&b->nb, split, i);
}
@ -263,11 +270,17 @@ vtn_handle_bitcast(struct vtn_builder *b, struct vtn_ssa_value *dest,
unsigned divisor = dest_bit_size / src_bit_size;
for (unsigned comp = 0; comp < dest_components; comp++) {
unsigned channels = ((1 << divisor) - 1) << (comp * divisor);
nir_ssa_def *src_chan =
nir_channels(&b->nb, src, channels);
vtn_assert(dest_bit_size == 64);
vtn_assert(src_bit_size == 32);
dest_chan[comp] = nir_pack_64_2x32(&b->nb, src_chan);
nir_ssa_def *src_chan = nir_channels(&b->nb, src, channels);
if (dest_bit_size == 64) {
assert(src_bit_size == 32 || src_bit_size == 16);
dest_chan[comp] = src_bit_size == 32 ?
nir_pack_64_2x32(&b->nb, src_chan) :
nir_pack_64_4x16(&b->nb, src_chan);
} else {
vtn_assert(dest_bit_size == 32);
vtn_assert(src_bit_size == 16);
dest_chan[comp] = nir_pack_32_2x16(&b->nb, src_chan);
}
}
}
dest->def = nir_vec(&b->nb, dest_chan, dest_components);