tcg: Split out tcg_out_ext16s

We will need a backend interface for performing 16-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, 8 insertions, 5 deletions

diff --git a/tcg/aarch64/tcg-target.c.inc b/tcg/aarch64/tcg-target.c.inc
index cca9136..3527c14 100644
--- a/tcg/aarch64/tcg-target.c.inc
+++ b/tcg/aarch64/tcg-target.c.inc
@@ -1424,6 +1424,11 @@ static void tcg_out_ext8s(TCGContext *s, TCGType type, TCGReg rd, TCGReg rn)
     tcg_out_sxt(s, type, MO_8, rd, rn);
 }
 
+static void tcg_out_ext16s(TCGContext *s, TCGType type, TCGReg rd, TCGReg rn)
+{
+    tcg_out_sxt(s, type, MO_16, rd, rn);
+}
+
 static inline void tcg_out_uxt(TCGContext *s, MemOp s_bits,
                                TCGReg rd, TCGReg rn)
 {
@@ -2233,17 +2238,13 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
         tcg_out_rev(s, TCG_TYPE_I32, MO_16, a0, a1);
         if (a2 & TCG_BSWAP_OS) {
             /* Output must be sign-extended. */
-            tcg_out_sxt(s, ext, MO_16, a0, a0);
+            tcg_out_ext16s(s, ext, a0, a0);
         } else if ((a2 & (TCG_BSWAP_IZ | TCG_BSWAP_OZ)) == TCG_BSWAP_OZ) {
             /* Output must be zero-extended, but input isn't. */
             tcg_out_uxt(s, MO_16, a0, a0);
         }
         break;
 
-    case INDEX_op_ext16s_i64:
-    case INDEX_op_ext16s_i32:
-        tcg_out_sxt(s, ext, MO_16, a0, a1);
-        break;
     case INDEX_op_ext_i32_i64:
     case INDEX_op_ext32s_i64:
         tcg_out_sxt(s, TCG_TYPE_I64, MO_32, a0, a1);
@@ -2316,6 +2317,8 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
     case INDEX_op_ext8s_i64:
     case INDEX_op_ext8u_i32:
     case INDEX_op_ext8u_i64:
+    case INDEX_op_ext16s_i64:
+    case INDEX_op_ext16s_i32:
     default:
         g_assert_not_reached();
     }