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/* -*- mesa-c++ -*-
*
* Copyright (c) 2019 Collabora LTD
*
* Author: Gert Wollny <gert.wollny@collabora.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.
*/
#include "sfn_callstack.h"
namespace r600 {
CallStack::CallStack(r600_bytecode& bc):
m_bc(bc)
{
}
CallStack::~CallStack()
{
}
int CallStack::push(unsigned type)
{
switch (type) {
case FC_PUSH_VPM:
++m_bc.stack.push;
break;
case FC_PUSH_WQM:
++m_bc.stack.push_wqm;
break;
case FC_LOOP:
++m_bc.stack.loop;
break;
default:
assert(0);
}
return update_max_depth(type);
}
void CallStack::pop(unsigned type)
{
switch(type) {
case FC_PUSH_VPM:
--m_bc.stack.push;
assert(m_bc.stack.push >= 0);
break;
case FC_PUSH_WQM:
--m_bc.stack.push_wqm;
assert(m_bc.stack.push_wqm >= 0);
break;
case FC_LOOP:
--m_bc.stack.loop;
assert(m_bc.stack.loop >= 0);
break;
default:
assert(0);
break;
}
}
int CallStack::update_max_depth(unsigned type)
{
r600_stack_info& stack = m_bc.stack;
int elements;
int entries;
int entry_size = stack.entry_size;
elements = (stack.loop + stack.push_wqm ) * entry_size;
elements += stack.push;
switch (m_bc.chip_class) {
case R600:
case R700:
/* pre-r8xx: if any non-WQM PUSH instruction is invoked, 2 elements on
* the stack must be reserved to hold the current active/continue
* masks */
if (type == FC_PUSH_VPM || stack.push > 0) {
elements += 2;
}
break;
case CAYMAN:
/* r9xx: any stack operation on empty stack consumes 2 additional
* elements */
elements += 2;
break;
case EVERGREEN:
/* r8xx+: 2 extra elements are not always required, but one extra
* element must be added for each of the following cases:
* 1. There is an ALU_ELSE_AFTER instruction at the point of greatest
* stack usage.
* (Currently we don't use ALU_ELSE_AFTER.)
* 2. There are LOOP/WQM frames on the stack when any flavor of non-WQM
* PUSH instruction executed.
*
* NOTE: it seems we also need to reserve additional element in some
* other cases, e.g. when we have 4 levels of PUSH_VPM in the shader,
* then STACK_SIZE should be 2 instead of 1 */
if (type == FC_PUSH_VPM || stack.push > 0) {
elements += 1;
}
break;
default:
assert(0);
break;
}
entry_size = 4;
entries = (elements + (entry_size - 1)) / entry_size;
if (entries > stack.max_entries)
stack.max_entries = entries;
return elements;
}
}
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