On 12/02/2013 01:46 PM, Matt Turner wrote:
> total instructions in shared programs: 1519751 -> 1519442 (-0.02%)
> instructions in affected programs: 10154 -> 9845 (-3.04%)
> ---
> src/mesa/drivers/dri/i965/brw_fs_visitor.cpp | 23 +++++++++++++++--------
> src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp | 23 ++++++++++++++++-------
> 2 files changed, 31 insertions(+), 15 deletions(-)
>
> diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
> b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
> index 9eb9a9d..a0e803b 100644
> --- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
> +++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
> @@ -382,18 +382,25 @@ fs_visitor::visit(ir_expression *ir)
> emit(MOV(this->result, op[0]));
> break;
> case ir_unop_sign:
> - temp = fs_reg(this, ir->type);
> + if (ir->type->is_float()) {
> + emit(CMP(reg_null_f, op[0], fs_reg(0.0f), BRW_CONDITIONAL_NZ));
>
> - emit(MOV(this->result, fs_reg(0.0f)));
> + op[0].type = BRW_REGISTER_TYPE_UD;
> + this->result.type = BRW_REGISTER_TYPE_UD;
> + emit(AND(this->result, op[0], fs_reg(0x80000000u)));
>
> - emit(CMP(reg_null_f, op[0], fs_reg(0.0f), BRW_CONDITIONAL_G));
> - inst = emit(MOV(this->result, fs_reg(1.0f)));
> - inst->predicate = BRW_PREDICATE_NORMAL;
> + inst = emit(OR(this->result, this->result, fs_reg(0x3f800000u)));
> + inst->predicate = BRW_PREDICATE_NORMAL;
>
> - emit(CMP(reg_null_f, op[0], fs_reg(0.0f), BRW_CONDITIONAL_L));
> - inst = emit(MOV(this->result, fs_reg(-1.0f)));
> - inst->predicate = BRW_PREDICATE_NORMAL;
> + this->result.type = BRW_REGISTER_TYPE_F;
> + } else {
> + emit(CMP(reg_null_d, op[0], fs_reg(0), BRW_CONDITIONAL_G));
>
> + emit(ASR(this->result, op[0], fs_reg(31)));
> +
> + inst = emit(OR(this->result, this->result, fs_reg(1)));
> + inst->predicate = BRW_PREDICATE_NORMAL;
> + }
> break;
> case ir_unop_rcp:
> emit_math(SHADER_OPCODE_RCP, this->result, op[0]);
> diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
> b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
> index a13eafb..986663b 100644
> --- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
> +++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
> @@ -1259,16 +1259,25 @@ vec4_visitor::visit(ir_expression *ir)
> break;
>
> case ir_unop_sign:
> - emit(MOV(result_dst, src_reg(0.0f)));
> + if (ir->type->is_float()) {
> + emit(CMP(dst_null_f(), op[0], src_reg(0.0f), BRW_CONDITIONAL_NZ));
>
> - emit(CMP(dst_null_d(), op[0], src_reg(0.0f), BRW_CONDITIONAL_G));
> - inst = emit(MOV(result_dst, src_reg(1.0f)));
> - inst->predicate = BRW_PREDICATE_NORMAL;
> + op[0].type = BRW_REGISTER_TYPE_UD;
> + result_dst.type = BRW_REGISTER_TYPE_UD;
> + emit(AND(result_dst, op[0], src_reg(0x80000000u)));
>
> - emit(CMP(dst_null_d(), op[0], src_reg(0.0f), BRW_CONDITIONAL_L));
> - inst = emit(MOV(result_dst, src_reg(-1.0f)));
> - inst->predicate = BRW_PREDICATE_NORMAL;
> + inst = emit(OR(result_dst, src_reg(result_dst),
> src_reg(0x3f800000u)));
> + inst->predicate = BRW_PREDICATE_NORMAL;
> +
> + this->result.type = BRW_REGISTER_TYPE_F;
> + } else {
> + emit(CMP(dst_null_d(), op[0], src_reg(0), BRW_CONDITIONAL_G));
> +
> + emit(ASR(result_dst, op[0], src_reg(31)));
>
> + inst = emit(OR(result_dst, src_reg(result_dst), src_reg(1)));
> + inst->predicate = BRW_PREDICATE_NORMAL;
> + }
> break;
>
> case ir_unop_rcp:
Some comments in both cases would be great. But this looks correct, and
definitely more efficient.
Reviewed-by: Kenneth Graunke <kenn...@whitecape.org>
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