Fix signed integer comparison in AMOMIN.W and AMOMAX.W

The current implementation of the AMOMIN.W and AMOMAX.W instructions
incorrectly compares the values of registers rd and rs2 as unsigned
integers instead of signed integers. Correct this behavior by properly
treating rd and rs2 as signed integers before performing the
comparison.

Author: visitorckw

src/rv32_template.c

@@ -1376,8 +1376,9 @@ RVOP(
     amominw,
     {
         rv->X[ir->rd] = rv->io.mem_read_w(ir->rs1);
-        const int32_t res =
-            rv->X[ir->rd] < rv->X[ir->rs2] ? rv->X[ir->rd] : rv->X[ir->rs2];
+        const int32_t a = rv->X[ir->rd];
+        const int32_t b = rv->X[ir->rs2];
+        const uint32_t res = a < b ? rv->X[ir->rd] : rv->X[ir->rs2];
         rv->io.mem_write_s(ir->rs1, res);
     },
     GEN({
@@ -1389,8 +1390,9 @@ RVOP(
     amomaxw,
     {
         rv->X[ir->rd] = rv->io.mem_read_w(ir->rs1);
-        const int32_t res =
-            rv->X[ir->rd] > rv->X[ir->rs2] ? rv->X[ir->rd] : rv->X[ir->rs2];
+        const int32_t a = rv->X[ir->rd];
+        const int32_t b = rv->X[ir->rs2];
+        const uint32_t res = a > b ? rv->X[ir->rd] : rv->X[ir->rs2];
         rv->io.mem_write_s(ir->rs1, res);
     },
     GEN({