32-bit host sign extension fix (Juergen Lock).

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4017 c046a42c-6fe2-441c-8c8c-71466251a162

tcg/tcg-op.h

@@ -1172,7 +1172,7 @@ static inline void tcg_gen_qemu_ld8s(TCGv ret, TCGv addr, int mem_index)
     tcg_gen_op3i(INDEX_op_qemu_ld8s, ret, addr, mem_index);
 #else
     tcg_gen_op4i(INDEX_op_qemu_ld8s, ret, addr, TCGV_HIGH(addr), mem_index);
-    tcg_gen_ext8s_i32(TCGV_HIGH(ret), ret);
+    tcg_gen_sari_i32(TCGV_HIGH(ret), ret, 31);
 #endif
 }
 
@@ -1192,7 +1192,7 @@ static inline void tcg_gen_qemu_ld16s(TCGv ret, TCGv addr, int mem_index)
     tcg_gen_op3i(INDEX_op_qemu_ld16s, ret, addr, mem_index);
 #else
     tcg_gen_op4i(INDEX_op_qemu_ld16s, ret, addr, TCGV_HIGH(addr), mem_index);
-    tcg_gen_ext16s_i32(TCGV_HIGH(ret), ret);
+    tcg_gen_sari_i32(TCGV_HIGH(ret), ret, 31);
 #endif
 }