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Diffstat (limited to 'gcc/doc/extend.texi')
| -rw-r--r-- | gcc/doc/extend.texi | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index c78ffb2dabc..de056618226 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -7918,6 +7918,13 @@ vector. If both @code{b} and @code{c} are scalars and the type of @code{b} and @code{c} are converted to a vector type whose elements have this type and with the same number of elements as @code{a}. +In C++, the logic operators @code{!, &&, ||} are available for vectors. +@code{!v} is equivalent to @code{v == 0}, @code{a && b} is equivalent to +@code{a!=0 & b!=0} and @code{a || b} is equivalent to @code{a!=0 | b!=0}. +For mixed operations between a scalar @code{s} and a vector @code{v}, +@code{s && v} is equivalent to @code{s?v!=0:0} (the evaluation is +short-circuit) and @code{v && s} is equivalent to @code{v!=0 & (s?-1:0)}. + Vector shuffling is available using functions @code{__builtin_shuffle (vec, mask)} and @code{__builtin_shuffle (vec0, vec1, mask)}. |