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i965/vec4: Optimize packSnorm4x8(). 

Reduces the number of instructions needed to implement packSnorm4x8()
from 13 -> 7.
This commit is contained in:
Matt Turner 2014-03-10 14:11:05 -07:00
parent 3532be7680
commit 70fcd56538
3 changed files with 29 additions and 4 deletions
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6
src/mesa/drivers/dri/i965/brw_shader.cpp
View File

@ -82,13 +82,13 @@ brw_lower_packing_builtins(struct brw_context *brw,
int ops = LOWER_PACK_SNORM_2x16
| LOWER_UNPACK_SNORM_2x16
| LOWER_PACK_UNORM_2x16
| LOWER_UNPACK_UNORM_2x16
| LOWER_PACK_SNORM_4x8;
| LOWER_UNPACK_UNORM_2x16;
if (shader_type == MESA_SHADER_FRAGMENT) {
ops |= LOWER_UNPACK_UNORM_4x8
| LOWER_UNPACK_SNORM_4x8
| LOWER_PACK_UNORM_4x8;
| LOWER_PACK_UNORM_4x8
| LOWER_PACK_SNORM_4x8;
}
if (brw->gen >= 7) {

1
src/mesa/drivers/dri/i965/brw_vec4.h
View File

@ -511,6 +511,7 @@ public:
void emit_unpack_unorm_4x8(const dst_reg &dst, src_reg src0);
void emit_unpack_snorm_4x8(const dst_reg &dst, src_reg src0);
void emit_pack_unorm_4x8(const dst_reg &dst, const src_reg &src0);
void emit_pack_snorm_4x8(const dst_reg &dst, const src_reg &src0);
uint32_t gather_channel(ir_texture *ir, uint32_t sampler);
src_reg emit_mcs_fetch(ir_texture *ir, src_reg coordinate, src_reg sampler);

26
src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
View File

@ -535,6 +535,28 @@ vec4_visitor::emit_pack_unorm_4x8(const dst_reg &dst, const src_reg &src0)
emit(VEC4_OPCODE_PACK_BYTES, dst, bytes);
}
void
vec4_visitor::emit_pack_snorm_4x8(const dst_reg &dst, const src_reg &src0)
{
dst_reg max(this, glsl_type::vec4_type);
emit_minmax(BRW_CONDITIONAL_G, max, src0, src_reg(-1.0f));
dst_reg min(this, glsl_type::vec4_type);
emit_minmax(BRW_CONDITIONAL_L, min, src_reg(max), src_reg(1.0f));
dst_reg scaled(this, glsl_type::vec4_type);
emit(MUL(scaled, src_reg(min), src_reg(127.0f)));
dst_reg rounded(this, glsl_type::vec4_type);
emit(RNDE(rounded, src_reg(scaled)));
dst_reg i(this, glsl_type::ivec4_type);
emit(MOV(i, src_reg(rounded)));
src_reg bytes(i);
emit(VEC4_OPCODE_PACK_BYTES, dst, bytes);
}
void
vec4_visitor::visit_instructions(const exec_list *list)
{
@ -1825,8 +1847,10 @@ vec4_visitor::visit(ir_expression *ir)
case ir_unop_pack_unorm_4x8:
emit_pack_unorm_4x8(result_dst, op[0]);
break;
case ir_unop_pack_snorm_2x16:
case ir_unop_pack_snorm_4x8:
emit_pack_snorm_4x8(result_dst, op[0]);
break;
case ir_unop_pack_snorm_2x16:
case ir_unop_pack_unorm_2x16:
case ir_unop_unpack_snorm_2x16:
case ir_unop_unpack_unorm_2x16: