tcg: Add TCG_OPF_NOT_PRESENT to opcodes without inputs or outputs

The br, mb, goto_tb and exit_tb opcodes do not have
register operands, only constants, flags, or labels.
Remove the special case in opcode_args_ct by including
TCG_OPF_NOT_PRESENT in the flags for these opcodes.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 0 insertions, 3 deletions

diff --git a/tcg/tcg.c b/tcg/tcg.c
index b9119a1..e9ecdc5 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -3371,9 +3371,6 @@ static const TCGArgConstraint *opcode_args_ct(const TCGOp *op)
     assert(tcg_op_supported(op->opc, TCGOP_TYPE(op), TCGOP_FLAGS(op)));
 #endif
 
-    if (def->nb_iargs + def->nb_oargs == 0) {
-        return NULL;
-    }
     if (def->flags & TCG_OPF_NOT_PRESENT) {
         return empty_cts;
     }