From 0ce159ec7fbcdf00c488b77f63e565e89ef6cab5 Mon Sep 17 00:00:00 2001 From: Antia Puentes Date: Wed, 17 Jun 2015 00:22:14 +0200 Subject: [PATCH] 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 --- src/mesa/drivers/dri/i965/brw_vec4_nir.cpp | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp index dff39709ab0..7576bbd455b 100644 --- a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp +++ b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp @@ -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"); } -- 2.30.2