tcg/optimize: Remove do_default label

Break the final cleanup clause out of the main switch
statement.  When fully folding an opcode to mov/movi,
use "continue" to process the next opcode, else break
to fall into the final cleanup.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
master
Richard Henderson 2021-08-23 22:30:17 -07:00
parent 3b3f847d75
commit b10f38339b
1 changed files with 94 additions and 96 deletions

View File

@ -1146,16 +1146,16 @@ void tcg_optimize(TCGContext *s)
switch (opc) {
CASE_OP_32_64_VEC(mov):
tcg_opt_gen_mov(s, op, op->args[0], op->args[1]);
break;
continue;
case INDEX_op_dup_vec:
if (arg_is_const(op->args[1])) {
tmp = arg_info(op->args[1])->val;
tmp = dup_const(TCGOP_VECE(op), tmp);
tcg_opt_gen_movi(s, &ctx, op, op->args[0], tmp);
break;
continue;
}
goto do_default;
break;
case INDEX_op_dup2_vec:
assert(TCG_TARGET_REG_BITS == 32);
@ -1163,13 +1163,13 @@ void tcg_optimize(TCGContext *s)
tcg_opt_gen_movi(s, &ctx, op, op->args[0],
deposit64(arg_info(op->args[1])->val, 32, 32,
arg_info(op->args[2])->val));
break;
continue;
} else if (args_are_copies(op->args[1], op->args[2])) {
op->opc = INDEX_op_dup_vec;
TCGOP_VECE(op) = MO_32;
nb_iargs = 1;
}
goto do_default;
break;
CASE_OP_32_64(not):
CASE_OP_32_64(neg):
@ -1187,9 +1187,9 @@ void tcg_optimize(TCGContext *s)
if (arg_is_const(op->args[1])) {
tmp = do_constant_folding(opc, arg_info(op->args[1])->val, 0);
tcg_opt_gen_movi(s, &ctx, op, op->args[0], tmp);
break;
continue;
}
goto do_default;
break;
CASE_OP_32_64(bswap16):
CASE_OP_32_64(bswap32):
@ -1198,9 +1198,9 @@ void tcg_optimize(TCGContext *s)
tmp = do_constant_folding(opc, arg_info(op->args[1])->val,
op->args[2]);
tcg_opt_gen_movi(s, &ctx, op, op->args[0], tmp);
break;
continue;
}
goto do_default;
break;
CASE_OP_32_64(add):
CASE_OP_32_64(sub):
@ -1228,9 +1228,9 @@ void tcg_optimize(TCGContext *s)
tmp = do_constant_folding(opc, arg_info(op->args[1])->val,
arg_info(op->args[2])->val);
tcg_opt_gen_movi(s, &ctx, op, op->args[0], tmp);
break;
continue;
}
goto do_default;
break;
CASE_OP_32_64(clz):
CASE_OP_32_64(ctz):
@ -1242,9 +1242,9 @@ void tcg_optimize(TCGContext *s)
} else {
tcg_opt_gen_mov(s, op, op->args[0], op->args[2]);
}
break;
continue;
}
goto do_default;
break;
CASE_OP_32_64(deposit):
if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
@ -1252,27 +1252,27 @@ void tcg_optimize(TCGContext *s)
op->args[3], op->args[4],
arg_info(op->args[2])->val);
tcg_opt_gen_movi(s, &ctx, op, op->args[0], tmp);
break;
continue;
}
goto do_default;
break;
CASE_OP_32_64(extract):
if (arg_is_const(op->args[1])) {
tmp = extract64(arg_info(op->args[1])->val,
op->args[2], op->args[3]);
tcg_opt_gen_movi(s, &ctx, op, op->args[0], tmp);
break;
continue;
}
goto do_default;
break;
CASE_OP_32_64(sextract):
if (arg_is_const(op->args[1])) {
tmp = sextract64(arg_info(op->args[1])->val,
op->args[2], op->args[3]);
tcg_opt_gen_movi(s, &ctx, op, op->args[0], tmp);
break;
continue;
}
goto do_default;
break;
CASE_OP_32_64(extract2):
if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
@ -1287,40 +1287,40 @@ void tcg_optimize(TCGContext *s)
((uint32_t)v2 << (32 - shr)));
}
tcg_opt_gen_movi(s, &ctx, op, op->args[0], tmp);
break;
continue;
}
goto do_default;
break;
CASE_OP_32_64(setcond):
tmp = do_constant_folding_cond(opc, op->args[1],
op->args[2], op->args[3]);
if (tmp != 2) {
tcg_opt_gen_movi(s, &ctx, op, op->args[0], tmp);
break;
continue;
}
goto do_default;
break;
CASE_OP_32_64(brcond):
tmp = do_constant_folding_cond(opc, op->args[0],
op->args[1], op->args[2]);
if (tmp != 2) {
if (tmp) {
memset(&ctx.temps_used, 0, sizeof(ctx.temps_used));
op->opc = INDEX_op_br;
op->args[0] = op->args[3];
} else {
tcg_op_remove(s, op);
}
switch (tmp) {
case 0:
tcg_op_remove(s, op);
continue;
case 1:
memset(&ctx.temps_used, 0, sizeof(ctx.temps_used));
op->opc = opc = INDEX_op_br;
op->args[0] = op->args[3];
break;
}
goto do_default;
break;
CASE_OP_32_64(movcond):
tmp = do_constant_folding_cond(opc, op->args[1],
op->args[2], op->args[5]);
if (tmp != 2) {
tcg_opt_gen_mov(s, op, op->args[0], op->args[4-tmp]);
break;
continue;
}
if (arg_is_const(op->args[3]) && arg_is_const(op->args[4])) {
uint64_t tv = arg_info(op->args[3])->val;
@ -1330,7 +1330,7 @@ void tcg_optimize(TCGContext *s)
if (fv == 1 && tv == 0) {
cond = tcg_invert_cond(cond);
} else if (!(tv == 1 && fv == 0)) {
goto do_default;
break;
}
op->args[3] = cond;
op->opc = opc = (opc == INDEX_op_movcond_i32
@ -1338,7 +1338,7 @@ void tcg_optimize(TCGContext *s)
: INDEX_op_setcond_i64);
nb_iargs = 2;
}
goto do_default;
break;
case INDEX_op_add2_i32:
case INDEX_op_sub2_i32:
@ -1363,9 +1363,9 @@ void tcg_optimize(TCGContext *s)
rh = op->args[1];
tcg_opt_gen_movi(s, &ctx, op, rl, (int32_t)a);
tcg_opt_gen_movi(s, &ctx, op2, rh, (int32_t)(a >> 32));
break;
continue;
}
goto do_default;
break;
case INDEX_op_mulu2_i32:
if (arg_is_const(op->args[2]) && arg_is_const(op->args[3])) {
@ -1379,39 +1379,40 @@ void tcg_optimize(TCGContext *s)
rh = op->args[1];
tcg_opt_gen_movi(s, &ctx, op, rl, (int32_t)r);
tcg_opt_gen_movi(s, &ctx, op2, rh, (int32_t)(r >> 32));
break;
continue;
}
goto do_default;
break;
case INDEX_op_brcond2_i32:
tmp = do_constant_folding_cond2(&op->args[0], &op->args[2],
op->args[4]);
if (tmp != 2) {
if (tmp) {
do_brcond_true:
memset(&ctx.temps_used, 0, sizeof(ctx.temps_used));
op->opc = INDEX_op_br;
op->args[0] = op->args[5];
} else {
if (tmp == 0) {
do_brcond_false:
tcg_op_remove(s, op);
}
} else if ((op->args[4] == TCG_COND_LT
|| op->args[4] == TCG_COND_GE)
&& arg_is_const(op->args[2])
&& arg_info(op->args[2])->val == 0
&& arg_is_const(op->args[3])
&& arg_info(op->args[3])->val == 0) {
tcg_op_remove(s, op);
continue;
}
if (tmp == 1) {
do_brcond_true:
op->opc = opc = INDEX_op_br;
op->args[0] = op->args[5];
break;
}
if ((op->args[4] == TCG_COND_LT || op->args[4] == TCG_COND_GE)
&& arg_is_const(op->args[2])
&& arg_info(op->args[2])->val == 0
&& arg_is_const(op->args[3])
&& arg_info(op->args[3])->val == 0) {
/* Simplify LT/GE comparisons vs zero to a single compare
vs the high word of the input. */
do_brcond_high:
memset(&ctx.temps_used, 0, sizeof(ctx.temps_used));
op->opc = INDEX_op_brcond_i32;
op->opc = opc = INDEX_op_brcond_i32;
op->args[0] = op->args[1];
op->args[1] = op->args[3];
op->args[2] = op->args[4];
op->args[3] = op->args[5];
} else if (op->args[4] == TCG_COND_EQ) {
break;
}
if (op->args[4] == TCG_COND_EQ) {
/* Simplify EQ comparisons where one of the pairs
can be simplified. */
tmp = do_constant_folding_cond(INDEX_op_brcond_i32,
@ -1428,7 +1429,7 @@ void tcg_optimize(TCGContext *s)
if (tmp == 0) {
goto do_brcond_false;
} else if (tmp != 1) {
goto do_default;
break;
}
do_brcond_low:
memset(&ctx.temps_used, 0, sizeof(ctx.temps_used));
@ -1436,7 +1437,9 @@ void tcg_optimize(TCGContext *s)
op->args[1] = op->args[2];
op->args[2] = op->args[4];
op->args[3] = op->args[5];
} else if (op->args[4] == TCG_COND_NE) {
break;
}
if (op->args[4] == TCG_COND_NE) {
/* Simplify NE comparisons where one of the pairs
can be simplified. */
tmp = do_constant_folding_cond(INDEX_op_brcond_i32,
@ -1455,9 +1458,6 @@ void tcg_optimize(TCGContext *s)
} else if (tmp == 1) {
goto do_brcond_true;
}
goto do_default;
} else {
goto do_default;
}
break;
@ -1467,12 +1467,13 @@ void tcg_optimize(TCGContext *s)
if (tmp != 2) {
do_setcond_const:
tcg_opt_gen_movi(s, &ctx, op, op->args[0], tmp);
} else if ((op->args[5] == TCG_COND_LT
|| op->args[5] == TCG_COND_GE)
&& arg_is_const(op->args[3])
&& arg_info(op->args[3])->val == 0
&& arg_is_const(op->args[4])
&& arg_info(op->args[4])->val == 0) {
continue;
}
if ((op->args[5] == TCG_COND_LT || op->args[5] == TCG_COND_GE)
&& arg_is_const(op->args[3])
&& arg_info(op->args[3])->val == 0
&& arg_is_const(op->args[4])
&& arg_info(op->args[4])->val == 0) {
/* Simplify LT/GE comparisons vs zero to a single compare
vs the high word of the input. */
do_setcond_high:
@ -1482,7 +1483,9 @@ void tcg_optimize(TCGContext *s)
op->args[1] = op->args[2];
op->args[2] = op->args[4];
op->args[3] = op->args[5];
} else if (op->args[5] == TCG_COND_EQ) {
break;
}
if (op->args[5] == TCG_COND_EQ) {
/* Simplify EQ comparisons where one of the pairs
can be simplified. */
tmp = do_constant_folding_cond(INDEX_op_setcond_i32,
@ -1499,7 +1502,7 @@ void tcg_optimize(TCGContext *s)
if (tmp == 0) {
goto do_setcond_high;
} else if (tmp != 1) {
goto do_default;
break;
}
do_setcond_low:
reset_temp(op->args[0]);
@ -1507,7 +1510,9 @@ void tcg_optimize(TCGContext *s)
op->opc = INDEX_op_setcond_i32;
op->args[2] = op->args[3];
op->args[3] = op->args[5];
} else if (op->args[5] == TCG_COND_NE) {
break;
}
if (op->args[5] == TCG_COND_NE) {
/* Simplify NE comparisons where one of the pairs
can be simplified. */
tmp = do_constant_folding_cond(INDEX_op_setcond_i32,
@ -1526,14 +1531,21 @@ void tcg_optimize(TCGContext *s)
} else if (tmp == 1) {
goto do_setcond_const;
}
goto do_default;
} else {
goto do_default;
}
break;
case INDEX_op_call:
if (!(tcg_call_flags(op)
default:
break;
}
/* Some of the folding above can change opc. */
opc = op->opc;
def = &tcg_op_defs[opc];
if (def->flags & TCG_OPF_BB_END) {
memset(&ctx.temps_used, 0, sizeof(ctx.temps_used));
} else {
if (opc == INDEX_op_call &&
!(tcg_call_flags(op)
& (TCG_CALL_NO_READ_GLOBALS | TCG_CALL_NO_WRITE_GLOBALS))) {
for (i = 0; i < nb_globals; i++) {
if (test_bit(i, ctx.temps_used.l)) {
@ -1541,29 +1553,15 @@ void tcg_optimize(TCGContext *s)
}
}
}
goto do_reset_output;
default:
do_default:
/* Default case: we know nothing about operation (or were unable
to compute the operation result) so no propagation is done.
We trash everything if the operation is the end of a basic
block, otherwise we only trash the output args. "z_mask" is
the non-zero bits mask for the first output arg. */
if (def->flags & TCG_OPF_BB_END) {
memset(&ctx.temps_used, 0, sizeof(ctx.temps_used));
} else {
do_reset_output:
for (i = 0; i < nb_oargs; i++) {
reset_temp(op->args[i]);
/* Save the corresponding known-zero bits mask for the
first output argument (only one supported so far). */
if (i == 0) {
arg_info(op->args[i])->z_mask = z_mask;
}
for (i = 0; i < nb_oargs; i++) {
reset_temp(op->args[i]);
/* Save the corresponding known-zero bits mask for the
first output argument (only one supported so far). */
if (i == 0) {
arg_info(op->args[i])->z_mask = z_mask;
}
}
break;
}
/* Eliminate duplicate and redundant fence instructions. */