* lib/target-supports.exp (check_effective_target_double64): New.
(check_effective_target_double64plus): New.
(check_effective_target_large_double): New.
* gcc.dg/Wconversion-real-integer.c: Require double64plus.
* gcc.dg/div-double-1.c: Likewise.
* gcc.dg/Wconversion-real.c: Require large_double.
* gcc.dg/cdce1.c: Require large_double instead of checking targets.

* gcc.c-torture/execute/ieee/unsafe-fp-assoc-1.c: Skip if doubles are too small.

* gcc.c-torture/execute/ieee/20010226-1.c: Mark all floating point
constants as long.

From-SVN: r146863