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changeset 9919:751833dcb7cb

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author Bruno Haible <bruno@clisp.org>
date Sun, 13 Apr 2008 22:52:00 +0200
parents 82e6377c749d
children fe4e6b58eb84
files lib/count-one-bits.h
diffstat 1 files changed, 2 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/lib/count-one-bits.h	Sun Apr 13 22:39:41 2008 +0200
+++ b/lib/count-one-bits.h	Sun Apr 13 22:52:00 2008 +0200
@@ -30,6 +30,8 @@
         return BUILTIN (x);
 #else
 #define COUNT_ONE_BITS(BUILTIN, TYPE)                                       \
+        /* This condition is written so as to avoid shifting by more than   \
+           31 bits at once, and also avoids a random HP-UX cc bug.  */      \
         verify (((TYPE) -1 >> 31 >> 31 >> 2) == 0); /* TYPE has at most 64 bits */ \
         int count = count_one_bits_32 (x);                                  \
         if (1 < (TYPE) -1 >> 31) /* TYPE has more than 32 bits? */          \