revert commit b8b6a5f

As it will cause printf("%llu\n", (unsigned long long)1e19); output
9223372036854775808
instead of
10000000000000000000

Author: kbkpbot

tccgen.c

@@ -3252,10 +3252,7 @@ static void gen_cast(CType *type)
                 vtop->c.i = (vtop->c.ld != 0);
             } else {
                 if(sf)
-                    /* the range of [int64_t] is enough to hold the integer part of any float value.
-                       Meanwhile, converting negative double to unsigned integer is UB.
-                       So first convert to [int64_t] here. */
-                    vtop->c.i = (int64_t)vtop->c.ld;
+                    vtop->c.i = vtop->c.ld;
                 else if (sbt_bt == VT_LLONG || (PTR_SIZE == 8 && sbt == VT_PTR))
                     ;
                 else if (sbt & VT_UNSIGNED)

tests/tests2/134_double_to_signed.c

@@ -7,4 +7,6 @@ int main() {
   printf("%d\n", (int)-2147483648.0);
   d = -2147483648.0;
   printf("%d\n", (int)d);
+
+  printf("%llu\n", (unsigned long long)1e19);
 }

tests/tests2/134_double_to_signed.expect

@@ -2,3 +2,4 @@
 -1
 -2147483648
 -2147483648
+10000000000000000000