diff options
Diffstat (limited to 'gcc/doc/c-tree.texi')
| -rw-r--r-- | gcc/doc/c-tree.texi | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/gcc/doc/c-tree.texi b/gcc/doc/c-tree.texi index e605d738155..29ccaec317d 100644 --- a/gcc/doc/c-tree.texi +++ b/gcc/doc/c-tree.texi @@ -1720,6 +1720,7 @@ This macro returns the attributes on the type @var{type}. @findex PTRMEM_CST_MEMBER @tindex VAR_DECL @tindex NEGATE_EXPR +@tindex ABS_EXPR @tindex BIT_NOT_EXPR @tindex TRUTH_NOT_EXPR @tindex ADDR_EXPR @@ -1915,6 +1916,20 @@ determined by looking at the type of the expression. The behavior of this operation on signed arithmetic overflow is controlled by the @code{flag_wrapv} and @code{flag_trapv} variables. +@item ABS_EXPR +These nodes represent the absolute value of the single operand, for +both integer and floating-point types. This is typically used to +implement the @code{abs}, @code{labs} and @code{llabs} builtins for +integer types, and the @code{fabs}, @code{fabsf} and @code{fabsl} +builtins for floating point types. The type of abs operation can +be determined by looking at the type of the expression. + +This node is not used for complex types. To represent the modulus +or complex abs of a complex value, use the @code{BUILT_IN_CABS}, +@code{BUILT_IN_CABSF} or @code{BUILT_IN_CABSL} builtins, as used +to implement the C99 @code{cabs}, @code{cabsf} and @code{cabsl} +built-in functions. + @item BIT_NOT_EXPR These nodes represent bitwise complement, and will always have integral type. The only operand is the value to be complemented. |