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pan/bi: Handle special ops in NIR->BIR

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Only on supported GPUs at the moment; for older Bifrost that don't
support these, I'm not sure yet where the right place to do the lowering
is. NIR algebraic rules would be "nice" but probably impractical -- but
it wouldn't be hard to do it directly in BIR (as a lowering pass or
alternative implementation).

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4139>
This commit is contained in:
Alyssa Rosenzweig 2020-03-09 21:20:20 -04:00 • committed by Marge Bot
parent b674e39d72
commit 8ed79c9ed7
1 changed files with 21 additions and 0 deletions
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21
src/panfrost/bifrost/bifrost_compile.c
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@ -270,6 +270,12 @@ bi_class_for_nir_alu(nir_op op)
case nir_op_mov:
return BI_MOV;
case nir_op_frcp:
case nir_op_frsq:
case nir_op_fsin:
case nir_op_fcos:
return BI_SPECIAL;
default:
unreachable("Unknown ALU op");
}
@ -286,6 +292,9 @@ emit_alu(bi_context *ctx, nir_alu_instr *instr)
| nir_dest_bit_size(instr->dest.dest),
};
/* TODO: Implement lowering of special functions for older Bifrost */
assert((alu.type != BI_SPECIAL) || !(ctx->quirks & BIFROST_NO_FAST_OP));
if (instr->dest.dest.is_ssa) {
/* Construct a writemask */
unsigned bits_per_comp = instr->dest.dest.ssa.bit_size;
@ -349,6 +358,18 @@ emit_alu(bi_context *ctx, nir_alu_instr *instr)
case nir_op_umax:
alu.op.minmax = BI_MINMAX_MAX; /* MINMAX */
break;
case nir_op_frcp:
alu.op.special = BI_SPECIAL_FRCP;
break;
case nir_op_frsq:
alu.op.special = BI_SPECIAL_FRSQ;
break;
case nir_op_fsin:
alu.op.special = BI_SPECIAL_FSIN;
break;
case nir_op_fcos:
alu.op.special = BI_SPECIAL_FCOS;
break;
default:
break;
}