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/*
* Copyright (C) 2018-2019 Alyssa Rosenzweig <alyssa@rosenzweig.io>
*
* 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
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* 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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS 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 "compiler.h"
void
mir_liveness_ins_update(uint16_t *live, midgard_instruction *ins, unsigned max)
{
/* live_in[s] = GEN[s] + (live_out[s] - KILL[s]) */
pan_liveness_kill(live, ins->dest, max, mir_bytemask(ins));
mir_foreach_src(ins, src) {
unsigned node = ins->src[src];
unsigned bytemask = mir_bytemask_of_read_components(ins, node);
pan_liveness_gen(live, node, max, bytemask);
}
}
static void
mir_liveness_ins_update_wrap(uint16_t *live, void *ins, unsigned max)
{
mir_liveness_ins_update(live, (midgard_instruction *) ins, max);
}
void
mir_compute_liveness(compiler_context *ctx)
{
/* If we already have fresh liveness, nothing to do */
if (ctx->metadata & MIDGARD_METADATA_LIVENESS)
return;
mir_compute_temp_count(ctx);
pan_compute_liveness(&ctx->blocks, ctx->temp_count, mir_liveness_ins_update_wrap);
/* Liveness is now valid */
ctx->metadata |= MIDGARD_METADATA_LIVENESS;
}
/* Once liveness data is no longer valid, call this */
void
mir_invalidate_liveness(compiler_context *ctx)
{
/* If we didn't already compute liveness, there's nothing to do */
if (!(ctx->metadata & MIDGARD_METADATA_LIVENESS))
return;
pan_free_liveness(&ctx->blocks);
/* It's now invalid regardless */
ctx->metadata &= ~MIDGARD_METADATA_LIVENESS;
}
bool
mir_is_live_after(compiler_context *ctx, midgard_block *block, midgard_instruction *start, int src)
{
mir_compute_liveness(ctx);
/* Check whether we're live in the successors */
if (pan_liveness_get(block->base.live_out, src, ctx->temp_count))
return true;
/* Check the rest of the block for liveness */
mir_foreach_instr_in_block_from(block, ins, mir_next_op(start)) {
if (mir_has_arg(ins, src))
return true;
}
return false;
}
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