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vc4: don't lower uadd_carry

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We can produce slightly better code for these in the backend, so
do that.

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18019>
This commit is contained in:
Eric Engestrom 2022-08-05 13:47:22 +01:00 • committed by Marge Bot
parent 7ee0b8b8df
commit 210e8a80ac
1 changed files with 18 additions and 0 deletions
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18
src/gallium/drivers/vc4/vc4_program.c
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@ -1053,6 +1053,14 @@ ntq_fddy(struct vc4_compile *c, struct qreg src)
qir_FSUB(c, src, from_bottom)));
}
static struct qreg
ntq_emit_cond_to_int(struct vc4_compile *c, enum qpu_cond cond)
{
return qir_MOV(c, qir_SEL(c, cond,
qir_uniform_ui(c, 1),
qir_uniform_ui(c, 0)));
}
static void
ntq_emit_alu(struct vc4_compile *c, nir_alu_instr *instr)
{
@ -1291,6 +1299,16 @@ ntq_emit_alu(struct vc4_compile *c, nir_alu_instr *instr)
result = ntq_fddy(c, src[0]);
break;
case nir_op_uadd_carry:
qir_SF(c, qir_ADD(c, src[0], src[1]));
result = ntq_emit_cond_to_int(c, QPU_COND_CS);
break;
case nir_op_usub_borrow:
qir_SF(c, qir_SUB(c, src[0], src[1]));
result = ntq_emit_cond_to_int(c, QPU_COND_CS);
break;
default:
fprintf(stderr, "unknown NIR ALU inst: ");
nir_print_instr(&instr->instr, stderr);