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/*
* Copyright 2013 Vadim Girlin <vadimgirlin@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Authors:
* Vadim Girlin
*/
#define GVN_DEBUG 0
#if GVN_DEBUG
#define GVN_DUMP(q) do { q } while (0)
#else
#define GVN_DUMP(q)
#endif
#include "sb_shader.h"
#include "sb_pass.h"
#include "sb_sched.h"
namespace r600_sb {
bool gvn::visit(node& n, bool enter) {
if (enter) {
bool rewrite = true;
if (n.dst[0]->is_agpr()) {
rewrite = false;
}
process_op(n, rewrite);
assert(n.parent);
if (n.parent->subtype == NST_LOOP_PHI_CONTAINER) {
// There is a problem - sometimes with nested loops
// loop counter initialization for inner loop is incorrectly hoisted
// out of the outer loop
// FIXME not sure if this is enough to fix a problem completely,
// possibly more complete fix is needed (anyway, the
// problem was seen only in relatively complex
// case involving nested loops and
// indirect access to loop counters (without proper array info
// loop counters may be considered as array elements too),
// was not seen in any tests
// or real apps when proper array information is available in TGSI).
// For now just mark the instructions that initialize loop counters
// with DONT_HOIST flag to prevent the insts like MOV r, 0
// (initialization of inner loop's counter with const)
// from being hoisted out of the outer loop
assert(!n.src.empty());
value *v = n.src[0];
if (v->is_any_gpr() && v->def)
v->def->flags |= NF_DONT_HOIST;
}
} else {
}
return true;
}
bool gvn::visit(cf_node& n, bool enter) {
if (enter) {
process_op(n);
} else {
}
return true;
}
bool gvn::visit(alu_node& n, bool enter) {
if (enter) {
process_op(n);
} else {
}
return true;
}
bool gvn::visit(alu_packed_node& n, bool enter) {
if (enter) {
process_op(n);
} else {
}
return false;
}
bool gvn::visit(fetch_node& n, bool enter) {
if (enter) {
process_op(n);
} else {
}
return true;
}
bool gvn::visit(region_node& n, bool enter) {
if (enter) {
// FIXME: loop_phi sources are undefined yet (except theone from the preceding
// code), can we handle that somehow?
// if (n.loop_phi)
// run_on(*n.loop_phi);
} else {
if (n.loop_phi)
run_on(*n.loop_phi);
if (n.phi)
run_on(*n.phi);
}
return true;
}
bool gvn::process_src(value* &v, bool rewrite) {
if (!v->gvn_source)
sh.vt.add_value(v);
if (rewrite && !v->gvn_source->is_rel()) {
v = v->gvn_source;
return true;
}
return false;
}
// FIXME: maybe handle it in the scheduler?
void gvn::process_alu_src_constants(node &n, value* &v) {
if (n.src.size() < 3) {
process_src(v, true);
return;
}
if (!v->gvn_source)
sh.vt.add_value(v);
rp_kcache_tracker kc(sh);
if (v->gvn_source->is_kcache())
kc.try_reserve(v->gvn_source->select);
// don't propagate 3rd constant to the trans-only instruction
if (!n.is_alu_packed()) {
alu_node *a = static_cast<alu_node*>(&n);
if (a->bc.op_ptr->src_count == 3 && !(a->bc.slot_flags & AF_V)) {
unsigned const_count = 0;
for (vvec::iterator I = n.src.begin(), E = n.src.end(); I != E;
++I) {
value *c = (*I);
if (c && c->is_readonly() && ++const_count == 2) {
process_src(v, false);
return;
}
}
}
}
for (vvec::iterator I = n.src.begin(), E = n.src.end(); I != E; ++I) {
value *c = (*I);
if (c->is_kcache() && !kc.try_reserve(c->select)) {
process_src(v, false);
return;
}
}
process_src(v, true);
}
void gvn::process_op(node& n, bool rewrite) {
for(vvec::iterator I = n.src.begin(), E = n.src.end(); I != E; ++I) {
value* &v = *I;
if (v) {
if (v->rel) {
process_src(v->rel, rewrite);
}
if (rewrite && v->gvn_source && v->gvn_source->is_readonly() &&
n.is_any_alu()) {
process_alu_src_constants(n, v);
} else if (rewrite && v->gvn_source && v->gvn_source->is_const() &&
(n.is_fetch_op(FETCH_OP_VFETCH) ||
n.is_fetch_op(FETCH_OP_SEMFETCH)))
process_src(v, false);
else
process_src(v, rewrite);
}
}
if (n.pred)
process_src(n.pred, false);
if (n.type == NT_IF) {
if_node &i = (if_node&)n;
if (i.cond)
process_src(i.cond, false);
}
for(vvec::iterator I = n.dst.begin(), E = n.dst.end(); I != E; ++I) {
value *v = *I;
if (v) {
if (v->rel)
process_src(v->rel, rewrite);
sh.vt.add_value(v);
}
}
}
} // namespace r600_sb
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