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extend.texi (__builtin_add_overflow_p): Clarify behavior when last argument is a bit-field.

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* doc/extend.texi (__builtin_add_overflow_p): Clarify behavior when
	last argument is a bit-field.

From-SVN: r237816
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Jakub Jelinek 2016-06-28 10:30:01 +02:00 • committed by Jakub Jelinek
parent 95ef39f441
commit 35ca24a2d1
2 changed files with 6 additions and 0 deletions
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@ -1,5 +1,8 @@
2016-06-28 Jakub Jelinek <jakub@redhat.com>
* doc/extend.texi (__builtin_add_overflow_p): Clarify behavior when
last argument is a bit-field.
PR rtl-optimization/71673
* internal-fn.c (expand_arith_overflow_result_store): Use
OPTAB_LIB_WIDEN instead of OPTAB_DIRECT as last argument to

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gcc/doc/extend.texi
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@ -9888,6 +9888,9 @@ cast to the type of the third argument. If the cast result is equal to the infi
precision result, the built-in functions return false, otherwise they return true.
The value of the third argument is ignored, just the side-effects in the third argument
are evaluated, and no integral argument promotions are performed on the last argument.
If the third argument is a bit-field, the type used for the result cast has the
precision and signedness of the given bit-field, rather than precision and signedness
of the underlying type.
For example, the following macro can be used to portably check, at
compile-time, whether or not adding two constant integers will overflow,