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r600/sb: add lds related peepholes. 

if no destination:
a) convert _RET instructions to non _RET variants if no dst
b) set src0 to undefined if it's a READ, this should get DCE then.

Acked-By: Roland Scheidegger <sroland@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2018-01-10 06:08:48 +00:00
parent 3bb2b2cc45
commit 44a27cdcec
1 changed files with 8 additions and 1 deletions
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9
src/gallium/drivers/r600/sb/sb_peephole.cpp
View File

@ -68,7 +68,14 @@ void peephole::run_on(container_node* c) {
if (n->is_alu_inst()) {
alu_node *a = static_cast<alu_node*>(n);
if (a->bc.op_ptr->flags &
if (a->bc.op_ptr->flags & AF_LDS) {
if (!a->dst[0]) {
if (a->bc.op >= LDS_OP2_LDS_ADD_RET && a->bc.op <= LDS_OP3_LDS_MSKOR_RET)
a->bc.set_op(a->bc.op - LDS_OP2_LDS_ADD_RET + LDS_OP2_LDS_ADD);
if (a->bc.op == LDS_OP1_LDS_READ_RET)
a->src[0] = sh.get_undef_value();
}
} else if (a->bc.op_ptr->flags &
(AF_PRED | AF_SET | AF_CMOV | AF_KILL)) {
optimize_cc_op(a);
} else if (a->bc.op == ALU_OP1_FLT_TO_INT) {