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pan/bi: Handle fmov class ops

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We need to lower them to something reasonable (ideally, the modifier
would be attached but we need to do something for the case it's not). We
specifically have to lower pre-sched as well, but we can do the lower
literally at schedule time for now (if this proves annoying, we can move
it earlier, but I want to leave room for modifier-aware copyprop should
that prove interesting).

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4396>
This commit is contained in:
Alyssa Rosenzweig 2020-03-31 22:16:55 -04:00 • committed by Marge Bot
parent 357b8b5906
commit 12cf9f43f0
3 changed files with 20 additions and 2 deletions
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2
src/panfrost/bifrost/bi_pack.c
View file

@ -780,7 +780,6 @@ bi_pack_fma(bi_clause *clause, bi_bundle bundle, struct bi_registers *regs)
return BIFROST_FMA_NOP;
case BI_MOV:
return bi_pack_fma_1src(bundle.fma, regs, BIFROST_FMA_OP_MOV);
case BI_FMOV:
case BI_SHIFT:
case BI_SWIZZLE:
case BI_ROUND:
@ -989,7 +988,6 @@ bi_pack_add(bi_clause *clause, bi_bundle bundle, struct bi_registers *regs)
return bi_pack_add_ld_var_addr(clause, bundle.add, regs);
case BI_MINMAX:
case BI_MOV:
case BI_FMOV:
case BI_SHIFT:
case BI_STORE:
return BIFROST_ADD_NOP;

1
src/panfrost/bifrost/bi_print.c
View file

@ -137,6 +137,7 @@ bi_class_name(enum bi_class cl)
case BI_CSEL: return "csel";
case BI_DISCARD: return "discard";
case BI_FMA: return "fma";
case BI_FMOV: return "fmov";
case BI_FREXP: return "frexp";
case BI_ISUB: return "isub";
case BI_LOAD: return "load";

19
src/panfrost/bifrost/bi_schedule.c
View file

@ -89,6 +89,22 @@ bi_ambiguous_abs(bi_instruction *ins)
return classy && typey && absy;
}
/* Lowers FMOV to ADD #0, since FMOV doesn't exist on the h/w and this is the
* latest time it's sane to lower (it's useful to distinguish before, but we'll
* need this handle during scheduling to ensure the ports get modeled
* correctly with respect to the new zero source) */
static void
bi_lower_fmov(bi_instruction *ins)
{
if (ins->type != BI_FMOV)
return;
ins->type = BI_ADD;
ins->src[1] = BIR_INDEX_ZERO;
ins->src_types[1] = ins->src_types[0];
}
/* Eventually, we'll need a proper scheduling, grouping instructions
* into clauses and ordering/assigning grouped instructions to the
* appropriate FMA/ADD slots. Right now we do the dumbest possible
@ -108,6 +124,9 @@ bi_schedule(bi_context *ctx)
list_inithead(&bblock->clauses);
bi_foreach_instr_in_block(bblock, ins) {
/* Convenient time to lower */
bi_lower_fmov(ins);
unsigned props = bi_class_props[ins->type];
bi_clause *u = rzalloc(ctx, bi_clause);