tcg: Split out tcg_out_ext8s

We will need a backend interface for performing 8-bit sign-extend.
Use it in tcg_reg_alloc_op in the meantime.

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

1 files changed, 16 insertions, 5 deletions

diff --git a/tcg/tcg.c b/tcg/tcg.c
index c3a8578951..76ba3e28cd 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -105,6 +105,7 @@ static void tcg_out_ld(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg1,
 static bool tcg_out_mov(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg);
 static void tcg_out_movi(TCGContext *s, TCGType type,
                          TCGReg ret, tcg_target_long arg);
+static void tcg_out_ext8s(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg);
 static void tcg_out_addi_ptr(TCGContext *s, TCGReg, TCGReg, tcg_target_long);
 static void tcg_out_exit_tb(TCGContext *s, uintptr_t arg);
 static void tcg_out_goto_tb(TCGContext *s, int which);
@@ -4496,11 +4497,21 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp *op)
     }
 
     /* emit instruction */
-    if (def->flags & TCG_OPF_VECTOR) {
-        tcg_out_vec_op(s, op->opc, TCGOP_VECL(op), TCGOP_VECE(op),
-                       new_args, const_args);
-    } else {
-        tcg_out_op(s, op->opc, new_args, const_args);
+    switch (op->opc) {
+    case INDEX_op_ext8s_i32:
+        tcg_out_ext8s(s, TCG_TYPE_I32, new_args[0], new_args[1]);
+        break;
+    case INDEX_op_ext8s_i64:
+        tcg_out_ext8s(s, TCG_TYPE_I64, new_args[0], new_args[1]);
+        break;
+    default:
+        if (def->flags & TCG_OPF_VECTOR) {
+            tcg_out_vec_op(s, op->opc, TCGOP_VECL(op), TCGOP_VECE(op),
+                           new_args, const_args);
+        } else {
+            tcg_out_op(s, op->opc, new_args, const_args);
+        }
+        break;
     }
 
     /* move the outputs in the correct register if needed */