https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77926
Bug ID: 77926
Summary: Add __builtin_iszero
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: jsm28 at gcc dot gnu.org
Target Milestone: ---
TS 18661-1 defines an iszero type-generic floating-point classification macro.
GCC should have a corresponding type-generic built-in function
__builtin_iszero. As with other such type-generic classification functions it
should be included in the cases in c-typeck.c:convert_arguments that remove
excess precision. (In the absence of signaling NaNs this can just be a
comparison against 0.)
