Update encoding

machine/encoding.h

@@ -132,22 +132,28 @@
   asm volatile ("csrr %0, " #reg : "=r"(__tmp)); \
   __tmp; })
 
-#define write_csr(reg, val) \
-  asm volatile ("csrw " #reg ", %0" :: "r"(val))
+#define write_csr(reg, val) ({ \
+  if (__builtin_constant_p(val) && (unsigned long)(val) < 32) \
+    asm volatile ("csrw " #reg ", %0" :: "i"(val)); \
+  else \
+    asm volatile ("csrw " #reg ", %0" :: "r"(val)); })
 
-#define swap_csr(reg, val) ({ long __tmp; \
-  asm volatile ("csrrw %0, " #reg ", %1" : "=r"(__tmp) : "r"(val)); \
+#define swap_csr(reg, val) ({ unsigned long __tmp; \
+  if (__builtin_constant_p(val) && (unsigned long)(val) < 32) \
+    asm volatile ("csrrw %0, " #reg ", %1" : "=r"(__tmp) : "i"(val)); \
+  else \
+    asm volatile ("csrrw %0, " #reg ", %1" : "=r"(__tmp) : "r"(val)); \
   __tmp; })
 
 #define set_csr(reg, bit) ({ unsigned long __tmp; \
-  if (__builtin_constant_p(bit) && (bit) < 32) \
+  if (__builtin_constant_p(bit) && (unsigned long)(bit) < 32) \
     asm volatile ("csrrs %0, " #reg ", %1" : "=r"(__tmp) : "i"(bit)); \
   else \
     asm volatile ("csrrs %0, " #reg ", %1" : "=r"(__tmp) : "r"(bit)); \
   __tmp; })
 
 #define clear_csr(reg, bit) ({ unsigned long __tmp; \
-  if (__builtin_constant_p(bit) && (bit) < 32) \
+  if (__builtin_constant_p(bit) && (unsigned long)(bit) < 32) \
     asm volatile ("csrrc %0, " #reg ", %1" : "=r"(__tmp) : "i"(bit)); \
   else \
     asm volatile ("csrrc %0, " #reg ", %1" : "=r"(__tmp) : "r"(bit)); \