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tcg: mark set_label with TCG_OPF_BB_END flag 

set_label is effectively the end of a basic block, as no optimization
can be made accross it. It was treated as such in the liveness analysis
code, but as a special case.

Mark it with TCG_OPF_BB_END flag so that this information can be used
by other parts of the TCG code, and remove the special case in the liveness
analysis code.

Cc: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2012-09-10 14:23:49 +02:00
parent 5c2d2a9ee5
commit 332864bd95
2 changed files with 1 additions and 6 deletions
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2
tcg/tcg-opc.h
View File

@ -36,7 +36,7 @@ DEF(nopn, 0, 0, 1, 0) /* variable number of parameters */
DEF(discard, 1, 0, 0, 0)
DEF(set_label, 0, 0, 1, 0)
DEF(set_label, 0, 0, 1, TCG_OPF_BB_END)
DEF(call, 0, 1, 2, TCG_OPF_SIDE_EFFECTS) /* variable number of parameters */
DEF(jmp, 0, 1, 0, TCG_OPF_BB_END | TCG_OPF_SIDE_EFFECTS)
DEF(br, 0, 0, 1, TCG_OPF_BB_END | TCG_OPF_SIDE_EFFECTS)

5
tcg/tcg.c
View File

@ -1297,11 +1297,6 @@ static void tcg_liveness_analysis(TCGContext *s)
args--;
}
break;
case INDEX_op_set_label:
args--;
/* mark end of basic block */
tcg_la_bb_end(s, dead_temps);
break;
case INDEX_op_debug_insn_start:
args -= def->nb_args;
break;