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tcg: Split out more subroutines from liveness_pass_1 

Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2018-11-27 14:00:35 -08:00
parent 2616c80821
commit f65a061c39
1 changed files with 23 additions and 12 deletions
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35
tcg/tcg.c
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@ -2395,6 +2395,26 @@ static void la_bb_end(TCGContext *s, int ng, int nt)
} }
} }
/* liveness analysis: sync globals back to memory. */
static void la_global_sync(TCGContext *s, int ng)
{
int i;
for (i = 0; i < ng; ++i) {
s->temps[i].state |= TS_MEM;
}
}
/* liveness analysis: sync globals back to memory and kill. */
static void la_global_kill(TCGContext *s, int ng)
{
int i;
for (i = 0; i < ng; i++) {
s->temps[i].state = TS_DEAD | TS_MEM;
}
}
/* Liveness analysis : update the opc_arg_life array to tell if a /* Liveness analysis : update the opc_arg_life array to tell if a
given input arguments is dead. Instructions updating dead given input arguments is dead. Instructions updating dead
temporaries are removed. */ temporaries are removed. */
@ -2450,15 +2470,9 @@ static void liveness_pass_1(TCGContext *s)
if (!(call_flags & (TCG_CALL_NO_WRITE_GLOBALS | if (!(call_flags & (TCG_CALL_NO_WRITE_GLOBALS |
TCG_CALL_NO_READ_GLOBALS))) { TCG_CALL_NO_READ_GLOBALS))) {
/* globals should go back to memory */ la_global_kill(s, nb_globals);
for (i = 0; i < nb_globals; i++) {
s->temps[i].state = TS_DEAD | TS_MEM;
}
} else if (!(call_flags & TCG_CALL_NO_READ_GLOBALS)) { } else if (!(call_flags & TCG_CALL_NO_READ_GLOBALS)) {
/* globals should be synced to memory */ la_global_sync(s, nb_globals);
for (i = 0; i < nb_globals; i++) {
s->temps[i].state |= TS_MEM;
}
} }
/* record arguments that die in this helper */ /* record arguments that die in this helper */
@ -2601,10 +2615,7 @@ static void liveness_pass_1(TCGContext *s)
if (def->flags & TCG_OPF_BB_END) { if (def->flags & TCG_OPF_BB_END) {
la_bb_end(s, nb_globals, nb_temps); la_bb_end(s, nb_globals, nb_temps);
} else if (def->flags & TCG_OPF_SIDE_EFFECTS) { } else if (def->flags & TCG_OPF_SIDE_EFFECTS) {
/* globals should be synced to memory */ la_global_sync(s, nb_globals);
for (i = 0; i < nb_globals; i++) {
s->temps[i].state |= TS_MEM;
}
} }
/* record arguments that die in this opcode */ /* record arguments that die in this opcode */