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tcg: Remove opcodes instead of noping them out 

With the linked list scheme we need not leave nops in the stream
that we need to process later.

Reviewed-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2014-03-30 16:51:54 -07:00
parent c45cb8bb89
commit 0c627cdca2
3 changed files with 32 additions and 11 deletions
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14
tcg/optimize.c
View File

@ -758,7 +758,7 @@ static void tcg_constant_folding(TCGContext *s)
break;
do_mov3:
if (temps_are_copies(args[0], args[1])) {
op->opc = INDEX_op_nop;
tcg_op_remove(s, op);
} else {
tcg_opt_gen_mov(s, op, args, opc, args[0], args[1]);
}
@ -916,7 +916,7 @@ static void tcg_constant_folding(TCGContext *s)
if (affected == 0) {
assert(nb_oargs == 1);
if (temps_are_copies(args[0], args[1])) {
op->opc = INDEX_op_nop;
tcg_op_remove(s, op);
} else if (temps[args[1]].state != TCG_TEMP_CONST) {
tcg_opt_gen_mov(s, op, args, opc, args[0], args[1]);
} else {
@ -948,7 +948,7 @@ static void tcg_constant_folding(TCGContext *s)
CASE_OP_32_64(and):
if (temps_are_copies(args[1], args[2])) {
if (temps_are_copies(args[0], args[1])) {
op->opc = INDEX_op_nop;
tcg_op_remove(s, op);
} else {
tcg_opt_gen_mov(s, op, args, opc, args[0], args[1]);
}
@ -979,7 +979,7 @@ static void tcg_constant_folding(TCGContext *s)
switch (opc) {
CASE_OP_32_64(mov):
if (temps_are_copies(args[0], args[1])) {
op->opc = INDEX_op_nop;
tcg_op_remove(s, op);
break;
}
if (temps[args[1]].state != TCG_TEMP_CONST) {
@ -1074,7 +1074,7 @@ static void tcg_constant_folding(TCGContext *s)
op->opc = INDEX_op_br;
args[0] = args[3];
} else {
op->opc = INDEX_op_nop;
tcg_op_remove(s, op);
}
break;
}
@ -1084,7 +1084,7 @@ static void tcg_constant_folding(TCGContext *s)
tmp = do_constant_folding_cond(opc, args[1], args[2], args[5]);
if (tmp != 2) {
if (temps_are_copies(args[0], args[4-tmp])) {
op->opc = INDEX_op_nop;
tcg_op_remove(s, op);
} else if (temps[args[4-tmp]].state == TCG_TEMP_CONST) {
tcg_opt_gen_movi(s, op, args, opc,
args[0], temps[args[4-tmp]].val);
@ -1177,7 +1177,7 @@ static void tcg_constant_folding(TCGContext *s)
args[0] = args[5];
} else {
do_brcond_false:
op->opc = INDEX_op_nop;
tcg_op_remove(s, op);
}
} else if ((args[4] == TCG_COND_LT || args[4] == TCG_COND_GE)
&& temps[args[2]].state == TCG_TEMP_CONST

28
tcg/tcg.c
View File

@ -1244,6 +1244,29 @@ void tcg_add_target_add_op_defs(const TCGTargetOpDef *tdefs)
#endif
}
void tcg_op_remove(TCGContext *s, TCGOp *op)
{
int next = op->next;
int prev = op->prev;
if (next >= 0) {
s->gen_op_buf[next].prev = prev;
} else {
s->gen_last_op_idx = prev;
}
if (prev >= 0) {
s->gen_op_buf[prev].next = next;
} else {
s->gen_first_op_idx = next;
}
*op = (TCGOp){ .opc = INDEX_op_nop, .next = -1, .prev = -1 };
#ifdef CONFIG_PROFILER
s->del_op_count++;
#endif
}
#ifdef USE_LIVENESS_ANALYSIS
/* liveness analysis: end of function: all temps are dead, and globals
should be in memory. */
@ -1466,10 +1489,7 @@ 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 */

1
tcg/tcg.h
View File

@ -743,6 +743,7 @@ void tcg_add_target_add_op_defs(const TCGTargetOpDef *tdefs);
void tcg_gen_callN(TCGContext *s, void *func,
TCGArg ret, int nargs, TCGArg *args);
void tcg_op_remove(TCGContext *s, TCGOp *op);
void tcg_optimize(TCGContext *s);
/* only used for debugging purposes */