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i965/vec4: Track liveness of the flag register.

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Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner 2014-11-02 21:16:44 -08:00
parent b449366587
commit 7a5cc789de
2 changed files with 33 additions and 0 deletions
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28
src/mesa/drivers/dri/i965/brw_vec4_live_variables.cpp
View file

@ -85,6 +85,11 @@ vec4_live_variables::setup_def_use()
}
}
}
if (inst->reads_flag()) {
if (!BITSET_TEST(bd->flag_def, 0)) {
BITSET_SET(bd->flag_use, 0);
}
}
/* Check for unconditional writes to whole registers. These
* are the things that screen off preceding definitions of a
@ -101,6 +106,11 @@ vec4_live_variables::setup_def_use()
}
}
}
if (inst->writes_flag()) {
if (!BITSET_TEST(bd->flag_use, 0)) {
BITSET_SET(bd->flag_def, 0);
}
}
ip++;
}
@ -134,6 +144,13 @@ vec4_live_variables::compute_live_variables()
cont = true;
}
}
BITSET_WORD new_livein = (bd->flag_use[0] |
(bd->flag_liveout[0] &
~bd->flag_def[0]));
if (new_livein & ~bd->flag_livein[0]) {
bd->flag_livein[0] |= new_livein;
cont = true;
}
/* Update liveout */
foreach_list_typed(bblock_link, child_link, link, &block->children) {
@ -147,6 +164,12 @@ vec4_live_variables::compute_live_variables()
cont = true;
}
}
BITSET_WORD new_liveout = (child_bd->flag_livein[0] &
~bd->flag_liveout[0]);
if (new_liveout) {
bd->flag_liveout[0] |= new_liveout;
cont = true;
}
}
}
}
@ -166,6 +189,11 @@ vec4_live_variables::vec4_live_variables(vec4_visitor *v, cfg_t *cfg)
block_data[i].use = rzalloc_array(mem_ctx, BITSET_WORD, bitset_words);
block_data[i].livein = rzalloc_array(mem_ctx, BITSET_WORD, bitset_words);
block_data[i].liveout = rzalloc_array(mem_ctx, BITSET_WORD, bitset_words);
block_data[i].flag_def[0] = 0;
block_data[i].flag_use[0] = 0;
block_data[i].flag_livein[0] = 0;
block_data[i].flag_liveout[0] = 0;
}
setup_def_use();

5
src/mesa/drivers/dri/i965/brw_vec4_live_variables.h
View file

@ -49,6 +49,11 @@ struct block_data {
/** Which defs reach the exit point of the block. */
BITSET_WORD *liveout;
BITSET_WORD flag_def[1];
BITSET_WORD flag_use[1];
BITSET_WORD flag_livein[1];
BITSET_WORD flag_liveout[1];
};
class vec4_live_variables {