tcg/tci: Remove tci_read_r16s

Use explicit casts for ext16s opcodes.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/tci.c

@@ -57,13 +57,6 @@ static tcg_target_ulong tci_read_reg(const tcg_target_ulong *regs, TCGReg index)
     return regs[index];
 }
 
-#if TCG_TARGET_HAS_ext16s_i32 || TCG_TARGET_HAS_ext16s_i64
-static int16_t tci_read_reg16s(const tcg_target_ulong *regs, TCGReg index)
-{
-    return (int16_t)tci_read_reg(regs, index);
-}
-#endif
-
 #if TCG_TARGET_REG_BITS == 64
 static int32_t tci_read_reg32s(const tcg_target_ulong *regs, TCGReg index)
 {
@@ -152,17 +145,6 @@ tci_read_r(const tcg_target_ulong *regs, const uint8_t **tb_ptr)
     return value;
 }
 
-#if TCG_TARGET_HAS_ext16s_i32 || TCG_TARGET_HAS_ext16s_i64
-/* Read indexed register (16 bit signed) from bytecode. */
-static int16_t tci_read_r16s(const tcg_target_ulong *regs,
-                             const uint8_t **tb_ptr)
-{
-    int16_t value = tci_read_reg16s(regs, **tb_ptr);
-    *tb_ptr += 1;
-    return value;
-}
-#endif
-
 /* Read indexed register (32 bit) from bytecode. */
 static uint32_t tci_read_r32(const tcg_target_ulong *regs,
                              const uint8_t **tb_ptr)
@@ -671,8 +653,8 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
 #if TCG_TARGET_HAS_ext16s_i32
         case INDEX_op_ext16s_i32:
             t0 = *tb_ptr++;
-            t1 = tci_read_r16s(regs, &tb_ptr);
-            tci_write_reg(regs, t0, t1);
+            t1 = tci_read_r(regs, &tb_ptr);
+            tci_write_reg(regs, t0, (int16_t)t1);
             break;
 #endif
 #if TCG_TARGET_HAS_ext8u_i32
@@ -886,8 +868,8 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
 #if TCG_TARGET_HAS_ext16s_i64
         case INDEX_op_ext16s_i64:
             t0 = *tb_ptr++;
-            t1 = tci_read_r16s(regs, &tb_ptr);
-            tci_write_reg(regs, t0, t1);
+            t1 = tci_read_r(regs, &tb_ptr);
+            tci_write_reg(regs, t0, (int16_t)t1);
             break;
 #endif
 #if TCG_TARGET_HAS_ext16u_i64