Add some explanation for last change.

From-SVN: r52531

diff --git a/gcc/real.c b/gcc/real.c
index ad3d4b32e1955b8e7b3eda1b28aae9116d0b1840..56b365ef3635481c0ae286ab9e2d87b1a2028af4 100644 (file)
--- a/gcc/real.c
+++ b/gcc/real.c
@@ -209,7 +209,10 @@ typedef unsigned int UHItype __attribute__ ((mode (HI)));
 #endif
 
 /* Calculate the size of the generic "e" type.  This always has
-   identical in-memory size to REAL_VALUE_TYPE.
+   identical in-memory size to REAL_VALUE_TYPE.  The sizes are supposed
+   to be the same as well, but when REAL_VALUE_TYPE_SIZE is not evenly
+   divisible by HOST_BITS_PER_WIDE_INT we have some padding in
+   REAL_VALUE_TYPE.
    There are only two supported sizes: ten and six 16-bit words (160
    or 96 bits).  */