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i965/vec4_nir: Properly handle integer multiplies on BDW+

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Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Jason Ekstrand 2015-08-03 15:21:59 -07:00
parent 1d658cf879
commit c1d9b3ae0b
1 changed files with 27 additions and 23 deletions
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50
src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
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@ -775,31 +775,35 @@ vec4_visitor::nir_emit_alu(nir_alu_instr *instr)
break;
case nir_op_imul: {
nir_const_value *value0 = nir_src_as_const_value(instr->src[0].src);
nir_const_value *value1 = nir_src_as_const_value(instr->src[1].src);
if (devinfo->gen < 8) {
nir_const_value *value0 = nir_src_as_const_value(instr->src[0].src);
nir_const_value *value1 = nir_src_as_const_value(instr->src[1].src);
/* For integer multiplication, the MUL uses the low 16 bits of one of
* the operands (src0 through SNB, src1 on IVB and later). The MACH
* accumulates in the contribution of the upper 16 bits of that
* operand. If we can determine that one of the args is in the low
* 16 bits, though, we can just emit a single MUL.
*/
if (value0 && value0->u[0] < (1 << 16)) {
if (devinfo->gen < 7)
emit(MUL(dst, op[0], op[1]));
else
emit(MUL(dst, op[1], op[0]));
} else if (value1 && value1->u[0] < (1 << 16)) {
if (devinfo->gen < 7)
emit(MUL(dst, op[1], op[0]));
else
emit(MUL(dst, op[0], op[1]));
/* For integer multiplication, the MUL uses the low 16 bits of one of
* the operands (src0 through SNB, src1 on IVB and later). The MACH
* accumulates in the contribution of the upper 16 bits of that
* operand. If we can determine that one of the args is in the low
* 16 bits, though, we can just emit a single MUL.
*/
if (value0 && value0->u[0] < (1 << 16)) {
if (devinfo->gen < 7)
emit(MUL(dst, op[0], op[1]));
else
emit(MUL(dst, op[1], op[0]));
} else if (value1 && value1->u[0] < (1 << 16)) {
if (devinfo->gen < 7)
emit(MUL(dst, op[1], op[0]));
else
emit(MUL(dst, op[0], op[1]));
} else {
struct brw_reg acc = retype(brw_acc_reg(8), dst.type);
emit(MUL(acc, op[0], op[1]));
emit(MACH(dst_null_d(), op[0], op[1]));
emit(MOV(dst, src_reg(acc)));
}
} else {
struct brw_reg acc = retype(brw_acc_reg(8), dst.type);
emit(MUL(acc, op[0], op[1]));
emit(MACH(dst_null_d(), op[0], op[1]));
emit(MOV(dst, src_reg(acc)));
emit(MUL(dst, op[0], op[1]));
}
break;
}