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i965: Use source region <1,2,0> when converting to DF.

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Doing so allows us to use a single MOV in VEC4_OPCODE_TO_DOUBLE instead
of two.

Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
This commit is contained in:
Matt Turner
2017-01-12 18:05:58 -08:00
committed by Francisco Jerez
parent 3198ce3f96
commit 630b84cdc8
2 changed files with 28 additions and 13 deletions
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28
src/intel/compiler/brw_eu_emit.c
View File

@@ -1089,7 +1089,6 @@ void brw_##OP(struct brw_codegen *p, \
}
ALU1(MOV)
ALU2(SEL)
ALU1(NOT)
ALU2(AND)
@@ -1123,6 +1122,33 @@ ALU2(SUBB)
ROUND(RNDZ)
ROUND(RNDE)
brw_inst *
brw_MOV(struct brw_codegen *p, struct brw_reg dest, struct brw_reg src0)
{
const struct gen_device_info *devinfo = p->devinfo;
/* When converting F->DF on IVB/BYT, every odd source channel is ignored.
* To avoid the problems that causes, we use a <1,2,0> source region to read
* each element twice.
*/
if (devinfo->gen == 7 && !devinfo->is_haswell &&
brw_inst_access_mode(devinfo, p->current) == BRW_ALIGN_1 &&
dest.type == BRW_REGISTER_TYPE_DF &&
(src0.type == BRW_REGISTER_TYPE_F ||
src0.type == BRW_REGISTER_TYPE_D ||
src0.type == BRW_REGISTER_TYPE_UD) &&
!has_scalar_region(src0)) {
assert(src0.vstride == BRW_VERTICAL_STRIDE_4 &&
src0.width == BRW_WIDTH_4 &&
src0.hstride == BRW_HORIZONTAL_STRIDE_1);
src0.vstride = BRW_VERTICAL_STRIDE_1;
src0.width = BRW_WIDTH_2;
src0.hstride = BRW_HORIZONTAL_STRIDE_0;
}
return brw_alu1(p, BRW_OPCODE_MOV, dest, src0);
}
brw_inst *
brw_ADD(struct brw_codegen *p, struct brw_reg dest,

13
src/intel/compiler/brw_vec4_generator.cpp
View File

@@ -1958,18 +1958,7 @@ generate_code(struct brw_codegen *p,
brw_set_default_access_mode(p, BRW_ALIGN_1);
struct brw_reg tmp = retype(dst, src[0].type);
tmp.hstride = BRW_HORIZONTAL_STRIDE_2;
tmp.width = BRW_WIDTH_4;
src[0].vstride = BRW_VERTICAL_STRIDE_4;
src[0].hstride = BRW_HORIZONTAL_STRIDE_1;
src[0].width = BRW_WIDTH_4;
brw_MOV(p, tmp, src[0]);
tmp.vstride = BRW_VERTICAL_STRIDE_8;
tmp.hstride = BRW_HORIZONTAL_STRIDE_2;
tmp.width = BRW_WIDTH_4;
brw_MOV(p, dst, tmp);
brw_MOV(p, dst, src[0]);
brw_set_default_access_mode(p, BRW_ALIGN_16);
break;