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tcg: Tidy tcg_reg_alloc_op

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Replace goto allocate_in_reg with a boolean.
Remove o_preferred_regs which isn't used, except to copy.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-10-09 21:06:31 -07:00
parent 61b59fb269
commit 1c1824dca4
1 changed files with 21 additions and 24 deletions
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45
tcg/tcg.c
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@ -3607,7 +3607,8 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
/* satisfy input constraints */ /* satisfy input constraints */
for (k = 0; k < nb_iargs; k++) { for (k = 0; k < nb_iargs; k++) {
TCGRegSet i_preferred_regs, o_preferred_regs; TCGRegSet i_preferred_regs;
bool allocate_new_reg;
i = def->args_ct[nb_oargs + k].sort_index; i = def->args_ct[nb_oargs + k].sort_index;
arg = op->args[i]; arg = op->args[i];
@ -3622,9 +3623,12 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
continue; continue;
} }
i_preferred_regs = o_preferred_regs = 0; reg = ts->reg;
i_preferred_regs = 0;
allocate_new_reg = false;
if (arg_ct->ialias) { if (arg_ct->ialias) {
o_preferred_regs = op->output_pref[arg_ct->alias_index]; i_preferred_regs = op->output_pref[arg_ct->alias_index];
/* /*
* If the input is readonly, then it cannot also be an * If the input is readonly, then it cannot also be an
@ -3633,30 +3637,23 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
* register and move it. * register and move it.
*/ */
if (temp_readonly(ts) || !IS_DEAD_ARG(i)) { if (temp_readonly(ts) || !IS_DEAD_ARG(i)) {
goto allocate_in_reg; allocate_new_reg = true;
} else if (ts->val_type == TEMP_VAL_REG) {
/*
* Check if the current register has already been
* allocated for another input.
*/
allocate_new_reg = tcg_regset_test_reg(i_allocated_regs, reg);
} }
/*
* Check if the current register has already been allocated
* for another input aliased to an output.
*/
if (ts->val_type == TEMP_VAL_REG) {
reg = ts->reg;
for (int k2 = 0; k2 < k; k2++) {
int i2 = def->args_ct[nb_oargs + k2].sort_index;
if (def->args_ct[i2].ialias && reg == new_args[i2]) {
goto allocate_in_reg;
}
}
}
i_preferred_regs = o_preferred_regs;
} }
temp_load(s, ts, arg_ct->regs, i_allocated_regs, i_preferred_regs); if (!allocate_new_reg) {
reg = ts->reg; temp_load(s, ts, arg_ct->regs, i_allocated_regs, i_preferred_regs);
reg = ts->reg;
allocate_new_reg = !tcg_regset_test_reg(arg_ct->regs, reg);
}
if (!tcg_regset_test_reg(arg_ct->regs, reg)) { if (allocate_new_reg) {
allocate_in_reg:
/* /*
* Allocate a new register matching the constraint * Allocate a new register matching the constraint
* and move the temporary register into it. * and move the temporary register into it.
@ -3664,7 +3661,7 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
temp_load(s, ts, tcg_target_available_regs[ts->type], temp_load(s, ts, tcg_target_available_regs[ts->type],
i_allocated_regs, 0); i_allocated_regs, 0);
reg = tcg_reg_alloc(s, arg_ct->regs, i_allocated_regs, reg = tcg_reg_alloc(s, arg_ct->regs, i_allocated_regs,
o_preferred_regs, ts->indirect_base); i_preferred_regs, ts->indirect_base);
if (!tcg_out_mov(s, ts->type, reg, ts->reg)) { if (!tcg_out_mov(s, ts->type, reg, ts->reg)) {
/* /*
* Cross register class move not supported. Sync the * Cross register class move not supported. Sync the