KonstantinSeurer
/
mesa
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

i965/nir/vec4: Implement multiplication 

Implementation based on the vec4_visitor IR implementation
for the operations ir_binop_mul and ir_binop_imul_high.

Adds NIR ALU operations:
   * nir_op_fmul
   * nir_op_imul
   * nir_op_imul_high
   * nir_op_umul_high

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
This commit is contained in:
Antia Puentes 2015-06-16 23:50:46 +02:00 committed by Jason Ekstrand
parent 0675842b56
commit 9acebf1461
1 changed files with 44 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
View File

@ -700,6 +700,50 @@ vec4_visitor::nir_emit_alu(nir_alu_instr *instr)
inst->saturate = instr->dest.saturate;
break;
case nir_op_fmul:
inst = emit(MUL(dst, op[0], op[1]));
inst->saturate = instr->dest.saturate;
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);
/* 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)));
}
break;
}
case nir_op_imul_high:
case nir_op_umul_high: {
struct brw_reg acc = retype(brw_acc_reg(8), dst.type);
emit(MUL(acc, op[0], op[1]));
emit(MACH(dst, op[0], op[1]));
break;
}
default:
unreachable("Unimplemented ALU operation");
}