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i965: Mad hacks to avoid using MRFs on Ivybridge.

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Ivybridge's SEND instruction uses GRFs instead of MRFs.  Unfortunately,
a lot of our code explicitly uses MRFs, and rewriting it would take a
fair bit of effort.  In the meantime, use a hack:

- Change brw_set_dest, brw_set_src0, and brw_set_src1 to implicitly
  convert any MRFs into the top 16 GRFs.
- Enable gen6_resolve_implied_move on Ivybridge: Moving g0 to m0
  actually moves it to g111 thanks to the previous hack.

It remains to officially reserve these registers so the allocator
doesn't try to reuse them.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Kenneth Graunke 2011-04-09 00:32:46 -07:00
parent 550ad737f7
commit 482e8a6cd5
1 changed files with 19 additions and 1 deletions
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20
src/mesa/drivers/dri/i965/brw_eu_emit.c
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@ -64,7 +64,7 @@ gen6_resolve_implied_move(struct brw_compile *p,
GLuint msg_reg_nr)
{
struct intel_context *intel = &p->brw->intel;
if (intel->gen != 6)
if (intel->gen < 6)
return;
if (src->file != BRW_ARCHITECTURE_REGISTER_FILE || src->nr != BRW_ARF_NULL) {
@ -78,15 +78,29 @@ gen6_resolve_implied_move(struct brw_compile *p,
*src = brw_message_reg(msg_reg_nr);
}
static void
gen7_convert_mrf_to_grf(struct brw_compile *p, struct brw_reg *reg)
{
struct intel_context *intel = &p->brw->intel;
if (intel->gen == 7 && reg->file == BRW_MESSAGE_REGISTER_FILE) {
reg->file = BRW_GENERAL_REGISTER_FILE;
reg->nr += 111;
}
}
static void brw_set_dest(struct brw_compile *p,
struct brw_instruction *insn,
struct brw_reg dest)
{
struct intel_context *intel = &p->brw->intel;
if (dest.file != BRW_ARCHITECTURE_REGISTER_FILE &&
dest.file != BRW_MESSAGE_REGISTER_FILE)
assert(dest.nr < 128);
gen7_convert_mrf_to_grf(p, &dest);
insn->bits1.da1.dest_reg_file = dest.file;
insn->bits1.da1.dest_reg_type = dest.type;
insn->bits1.da1.dest_address_mode = dest.address_mode;
@ -216,6 +230,8 @@ static void brw_set_src0(struct brw_compile *p,
if (reg.type != BRW_ARCHITECTURE_REGISTER_FILE)
assert(reg.nr < 128);
gen7_convert_mrf_to_grf(p, &reg);
validate_reg(insn, reg);
insn->bits1.da1.src0_reg_file = reg.file;
@ -294,6 +310,8 @@ void brw_set_src1(struct brw_compile *p,
assert(reg.nr < 128);
gen7_convert_mrf_to_grf(p, &reg);
validate_reg(insn, reg);
insn->bits1.da1.src1_reg_file = reg.file;