diff options
Diffstat (limited to 'libc/ports/sysdeps/arm/fesetenv.c')
| -rw-r--r-- | libc/ports/sysdeps/arm/fesetenv.c | 56 |
1 files changed, 27 insertions, 29 deletions
diff --git a/libc/ports/sysdeps/arm/fesetenv.c b/libc/ports/sysdeps/arm/fesetenv.c index dabb88bb6..62031d596 100644 --- a/libc/ports/sysdeps/arm/fesetenv.c +++ b/libc/ports/sysdeps/arm/fesetenv.c @@ -24,38 +24,36 @@ int fesetenv (const fenv_t *envp) { - if (ARM_HAVE_VFP) + fpu_control_t fpscr; + + /* Fail if a VFP unit isn't present. */ + if (!ARM_HAVE_VFP) + return 1; + + _FPU_GETCW (fpscr); + + /* Preserve the reserved FPSCR flags. */ + fpscr &= _FPU_RESERVED; + + if (envp == FE_DFL_ENV) + fpscr |= _FPU_DEFAULT; + else if (envp == FE_NOMASK_ENV) + fpscr |= _FPU_IEEE; + else + fpscr |= envp->__cw & ~_FPU_RESERVED; + + _FPU_SETCW (fpscr); + + if (envp == FE_NOMASK_ENV) { - unsigned int temp; - - _FPU_GETCW (temp); - temp &= _FPU_RESERVED; - - if (envp == FE_DFL_ENV) - temp |= _FPU_DEFAULT; - else if (envp == FE_NOMASK_ENV) - temp |= _FPU_IEEE; - else - temp |= envp->__cw & ~_FPU_RESERVED; - - _FPU_SETCW (temp); - - if (envp == FE_NOMASK_ENV) - { - /* VFPv3 and VFPv4 do not support trapping exceptions, so - test whether the relevant bits were set and fail if - not. */ - _FPU_GETCW (temp); - if ((temp & _FPU_IEEE) != _FPU_IEEE) - return 1; - } - - /* Success. */ - return 0; + /* Not all VFP architectures support trapping exceptions, so + test whether the relevant bits were set and fail if not. */ + _FPU_GETCW (fpscr); + if ((fpscr & _FPU_IEEE) != _FPU_IEEE) + return 1; } - /* Unsupported, so fail. */ - return 1; + return 0; } libm_hidden_def (fesetenv) |