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tcg: Remove unused opcodes

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We no longer need INDEX_op_end to terminate the list, nor do we
need 5 forms of nop, since we just remove the TCGOp instead.

Backports commit 15fc7daa770764cc795158cbb525569f156f3659 from qemu
This commit is contained in:
Richard Henderson 2018-02-09 13:20:10 -05:00 committed by Lioncash
parent 70f28c8bd5
commit 255a160c66
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 3 additions and 22 deletions
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9
qemu/tcg/tcg-opc.h
View file

@ -27,15 +27,6 @@
*/
/* predefined ops */
DEF(end, 0, 0, 0, TCG_OPF_NOT_PRESENT) /* must be kept first */
DEF(nop, 0, 0, 0, TCG_OPF_NOT_PRESENT)
DEF(nop1, 0, 0, 1, TCG_OPF_NOT_PRESENT)
DEF(nop2, 0, 0, 2, TCG_OPF_NOT_PRESENT)
DEF(nop3, 0, 0, 3, TCG_OPF_NOT_PRESENT)
/* variable number of parameters */
DEF(nopn, 0, 0, 1, TCG_OPF_NOT_PRESENT)
DEF(discard, 1, 0, 0, TCG_OPF_NOT_PRESENT)
DEF(set_label, 0, 0, 1, TCG_OPF_BB_END | TCG_OPF_NOT_PRESENT)

16
qemu/tcg/tcg.c
View file

@ -1290,7 +1290,6 @@ void tcg_op_remove(TCGContext *s, TCGOp *op)
{
int next = op->next;
int prev = op->prev;
TCGOp opp = {0};
if (next >= 0) {
s->gen_op_buf[next].prev = prev;
@ -1303,10 +1302,7 @@ void tcg_op_remove(TCGContext *s, TCGOp *op)
s->gen_first_op_idx = next;
}
opp.opc = INDEX_op_nop;
opp.next = -1;
opp.prev = -1;
*op = opp;
memset(op, -1, sizeof(*op));
#ifdef CONFIG_PROFILER
s->del_op_count++;
@ -1445,8 +1441,6 @@ static void tcg_liveness_analysis(TCGContext *s)
}
break;
case INDEX_op_debug_insn_start:
case INDEX_op_nop:
case INDEX_op_end:
break;
case INDEX_op_discard:
/* mark the temporary as dead */
@ -1549,10 +1543,7 @@ static void tcg_liveness_analysis(TCGContext *s)
}
}
do_remove:
op->opc = INDEX_op_nop;
#ifdef CONFIG_PROFILER
s->del_op_count++;
#endif
tcg_op_remove(s, op);
} else {
do_not_remove:
/* output args are dead */
@ -2323,7 +2314,7 @@ static void dump_op_count(void)
{
int i;
for(i = INDEX_op_end; i < NB_OPS; i++) {
for(i = 0; i < NB_OPS; i++) {
qemu_log("%s %" PRId64 "\n", s->tcg_op_defs[i].name, tcg_table_op_count[i]);
}
}
@ -2400,7 +2391,6 @@ static inline int tcg_gen_code_common(TCGContext *s,
tcg_reg_alloc_movi(s, args, dead_args, sync_args);
break;
case INDEX_op_debug_insn_start:
case INDEX_op_nop:
break;
case INDEX_op_discard:
temp_dead(s, args[0]);