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pan/bi: Copyprop constants 

Needed for constant folding to be effective. But don't copyprop into
instructions already reading from FAU, that will just end up adding more
moves!

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9239>
This commit is contained in:
Alyssa Rosenzweig 2021-04-13 18:54:31 -04:00 committed by Marge Bot
parent 1049bb4374
commit ff36e40145
1 changed files with 17 additions and 2 deletions
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19
src/panfrost/bifrost/bi_opt_copy_prop.c
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@ -30,7 +30,8 @@ static bool
bi_is_copy(bi_instr *ins)
{
return (ins->op == BI_OPCODE_MOV_I32) && bi_is_ssa(ins->dest[0])
&& (bi_is_ssa(ins->src[0]) || ins->src[0].type == BI_INDEX_FAU);
&& (bi_is_ssa(ins->src[0]) || ins->src[0].type == BI_INDEX_FAU
|| ins->src[0].type == BI_INDEX_CONSTANT);
}
static inline unsigned
@ -40,6 +41,17 @@ bi_word_node(bi_index idx)
return (idx.value << 2) | idx.offset;
}
static bool
bi_reads_fau(bi_instr *ins)
{
bi_foreach_src(ins, s) {
if (ins->src[s].type == BI_INDEX_FAU)
return true;
}
return false;
}
void
bi_opt_copy_prop(bi_context *ctx)
{
@ -65,10 +77,13 @@ bi_opt_copy_prop(bi_context *ctx)
bi_index use = ins->src[s];
if (use.type != BI_INDEX_NORMAL || use.reg) continue;
if (bi_count_read_registers(ins, s) != 1) continue;
if (s == 0 && bi_opcode_props[ins->op].sr_read) continue;
bi_index repl = replacement[bi_word_node(use)];
if (repl.type == BI_INDEX_CONSTANT && bi_reads_fau(ins))
continue;
if (!bi_is_null(repl))
ins->src[s] = bi_replace_index(ins->src[s], repl);
}