* config/fp-bit.c (clzusi): New function.
(si_to_float, usi_to_float): Use it to compute proper shift.
(usi_to_float): Preserve guard bits when shifting right.
* libgcc-std.ver (GCC_4.2.0): New version.
* libgcc2.c (__floatundixf, __floatunditf, __floatundidf,
__floatundisf): New functions.
* libgcc2.h (__floatundixf, __floatunditf, __floatundidf,
__floatundisf): Declare.
* mklibgcc.in (lib2funcs): Add _floatundidf, _floatundisf,
_floatundixf, and _floatunditf.
* optabs.c (expand_float): If target does not define a pattern for
signed or unsigned conversion, use an unsigned libcall instead of
a signed one.
(init_optabs): Initialize ufloat_optab.
testsuite:
* gcc.c-torture/execute/floatunsisf-1.c: New test.