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agx: Add helper to emit splits 

This should be used for vector destinations, to facilitate the extraction
optimization.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16268>
This commit is contained in:
Alyssa Rosenzweig 2022-04-12 19:45:34 -04:00
parent b30c718a57
commit 330ec4260d
1 changed files with 26 additions and 0 deletions
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26
src/asahi/compiler/agx_compile.c
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@ -137,6 +137,32 @@ agx_block_add_successor(agx_block *block, agx_block *successor)
unreachable("Too many successors");
}
/*
* Splits an n-component vector (vec) into n scalar destinations (dests) using a
* split pseudo-instruction.
*
* Pre-condition: dests is filled with agx_null().
*/
static void
agx_emit_split(agx_builder *b, agx_index *dests, agx_index vec, unsigned n)
{
/* Setup the destinations */
for (unsigned i = 0; i < n; ++i) {
dests[i] = agx_temp(b->shader, vec.size);
}
/* Emit the split */
agx_p_split_to(b, dests[0], dests[1], dests[2], dests[3], vec);
}
static void
agx_emit_cached_split(agx_builder *b, agx_index vec, unsigned n)
{
agx_index dests[4] = { agx_null(), agx_null(), agx_null(), agx_null() };
agx_emit_split(b, dests, vec, n);
agx_cache_combine(b, vec, dests[0], dests[1], dests[2], dests[3]);
}
static void
agx_emit_load_const(agx_builder *b, nir_load_const_instr *instr)
{