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v3d/compiler: implement nir_op_fquantize2f16

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Reviewd-by: Alejandro Piñeiro <apinheiro@igalia.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>
This commit is contained in:
Iago Toral Quiroga
2020-03-05 13:00:11 +01:00
committed by Marge Bot
parent cb7f148020
commit 1f41a128e0
3 changed files with 33 additions and 0 deletions
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21
src/broadcom/compiler/nir_to_vir.c
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@@ -1160,6 +1160,27 @@ ntq_emit_alu(struct v3d_compile *c, nir_alu_instr *instr)
vir_set_unpack(c->defs[result.index], 0, V3D_QPU_UNPACK_H);
break;
case nir_op_fquantize2f16: {
/* F32 -> F16 -> F32 conversion */
struct qreg tmp = vir_FMOV(c, src[0]);
vir_set_pack(c->defs[tmp.index], V3D_QPU_PACK_L);
tmp = vir_FMOV(c, tmp);
vir_set_unpack(c->defs[tmp.index], 0, V3D_QPU_UNPACK_L);
/* Check for denorm */
struct qreg abs_src = vir_FMOV(c, src[0]);
vir_set_unpack(c->defs[abs_src.index], 0, V3D_QPU_UNPACK_ABS);
struct qreg threshold = vir_uniform_f(c, ldexpf(1.0, -14));
vir_set_pf(vir_FCMP_dest(c, vir_nop_reg(), abs_src, threshold),
V3D_QPU_PF_PUSHC);
/* Return +/-0 for denorms */
struct qreg zero =
vir_AND(c, src[0], vir_uniform_ui(c, 0x80000000));
result = vir_FMOV(c, vir_SEL(c, V3D_QPU_COND_IFNA, tmp, zero));
break;
}
default:
fprintf(stderr, "unknown NIR ALU inst: ");
nir_print_instr(&instr->instr, stderr);