* sysdeps/hppa/fpu/fclrexcpt.c (feclearexcept): Use union to
align parameters. Specify memory clobbers.
* sysdeps/hppa/fpu/fedisblxcpt.c (fedisableexcept): Likewise.
* sysdeps/hppa/fpu/feenablxcpt.c (feenableexcept): Likewise.
* sysdeps/hppa/fpu/fegetenv.c (fegetenv): Do not save exception
register. Use memcpy to align buffer.
* sysdeps/hppa/fpu/fegetexcept.c (fegetexcept): Store and reload
fr0. Use union to align parameters.
* sysdeps/hppa/fpu/fegetround.c (fegetround): Likewise.
* sysdeps/hppa/fpu/feholdexcpt.c (feholdexcept): Do not save
exception registers. Define libm_hidden_def.
* sysdeps/hppa/fpu/fesetenv.c (fesetenv): Do not save exception
registers.
* sysdeps/hppa/fpu/fesetround.c (fesetround): Use union to
align parameters, speficy memory clobbers. Define libm_hidde_def
* sysdeps/hppa/fpu/feupdateenv.c (feupdateenv): Use union to align
parameters. Use memcpy to align buffer.
* sysdeps/hppa/fpu/fgetexcptflg.c (fegetexceptflag): Likewise.
* sysdeps/hppa/fpu/fsetexcptflg.c (fesetexceptflag): Likewise.
* sysdeps/hppa/fpu/ftestexcept.c (fetestexcept): Likewise.
* sysdeps/hppa/fpu/libm-test-ulps: Update.
* sysdeps/hppa/fpu/bits/fenv.h: Add ABI comments.
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