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intprops: work around C compiler bugs

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* lib/intprops.h (INT_MULTIPLY_RANGE_OVERFLOW): Work around compiler
bug in Sun C 5.11 2010/08/13 and other compilers; see
<http://lists.gnu.org/archive/html/bug-gnulib/2011-05/msg00401.html>.
This commit is contained in:
Paul Eggert
2011-05-19 01:36:25 -07:00
parent 48cc7484c7
commit 8cc0fee055
2 changed files with 16 additions and 6 deletions
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ChangeLog
+5
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@@ -1,5 +1,10 @@
2011-05-19 Paul Eggert <eggert@cs.ucla.edu>
intprops: work around C compiler bugs
* lib/intprops.h (INT_MULTIPLY_RANGE_OVERFLOW): Work around compiler
bug in Sun C 5.11 2010/08/13 and other compilers; see
<http://lists.gnu.org/archive/html/bug-gnulib/2011-05/msg00401.html>.
intprops: TYPE_IS_INTEGER, TYPE_SIGNED not integer constant exprs
* doc/intprops.texi (Integer Type Determination): Fix
documentation for TYPE_IS_INTEGER: it returns an constant
lib/intprops.h
+11 -6
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@@ -179,16 +179,21 @@
: 0 < (a))
/* Return 1 if A * B would overflow in [MIN,MAX] arithmetic.
See above for restrictions. */
See above for restrictions. Avoid && and || as they tickle
bugs in Sun C 5.11 2010/08/13 and other compilers; see
<http://lists.gnu.org/archive/html/bug-gnulib/2011-05/msg00401.html>. */
#define INT_MULTIPLY_RANGE_OVERFLOW(a, b, min, max) \
((b) < 0 \
? ((a) < 0 \
? (a) < (max) / (b) \
: (b) < -1 && (min) / (b) < (a)) \
: (0 < (b) \
&& ((a) < 0 \
? (a) < (min) / (b) \
: (max) / (b) < (a))))
: (b) == -1 \
? 0 \
: (min) / (b) < (a)) \
: (b) == 0 \
? 0 \
: ((a) < 0 \
? (a) < (min) / (b) \
: (max) / (b) < (a)))
/* Return 1 if A / B would overflow in [MIN,MAX] arithmetic.
See above for restrictions. Do not check for division by zero. */