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

i965/nir/vec4: Implement carry/borrow for addition/subtraction 

Adds NIR ALU operations:
   * nir_op_uadd_carry
   * nir_op_usub_borrow

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
This commit is contained in:
Antia Puentes 2015-06-17 00:22:14 +02:00 committed by Jason Ekstrand
parent 62cef7b072
commit 0ce159ec7f
1 changed files with 16 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
View File

@ -796,6 +796,22 @@ vec4_visitor::nir_emit_alu(nir_alu_instr *instr)
inst->saturate = instr->dest.saturate;
break;
case nir_op_uadd_carry: {
struct brw_reg acc = retype(brw_acc_reg(8), BRW_REGISTER_TYPE_UD);
emit(ADDC(dst_null_ud(), op[0], op[1]));
emit(MOV(dst, src_reg(acc)));
break;
}
case nir_op_usub_borrow: {
struct brw_reg acc = retype(brw_acc_reg(8), BRW_REGISTER_TYPE_UD);
emit(SUBB(dst_null_ud(), op[0], op[1]));
emit(MOV(dst, src_reg(acc)));
break;
}
default:
unreachable("Unimplemented ALU operation");
}