Functions

• bool fenv_is_round_up ()

  Quick free-standing test whether fegetround() == FE_UPWARD.

  Using the following observation:

  1.0f + 2^-25 = 1.0f for FE_TONEAREST, FE_DOWNWARD, FE_TOWARDZERO

  = 0x1.000002f for FE_UPWARD.

  Defined at line 26 of file ../../third_party/llvm-libc/src/src/__support/FPUtil/rounding_mode.h

• bool fenv_is_round_down ()

  Quick free-standing test whether fegetround() == FE_DOWNWARD.

  Using the following observation:

  -1.0f - 2^-25 = -1.0f for FE_TONEAREST, FE_UPWARD, FE_TOWARDZERO

  = -0x1.000002f for FE_DOWNWARD.

  Defined at line 35 of file ../../third_party/llvm-libc/src/src/__support/FPUtil/rounding_mode.h

• bool fenv_is_round_to_nearest ()

  Quick free-standing test whether fegetround() == FE_TONEAREST.

  Using the following observation:

  1.5f + 2^-24 = 1.5f for FE_TONEAREST, FE_DOWNWARD, FE_TOWARDZERO

  = 0x1.100002p0f for FE_UPWARD,

  1.5f - 2^-24 = 1.5f for FE_TONEAREST, FE_UPWARD

  = 0x1.0ffffep-1f for FE_DOWNWARD, FE_TOWARDZERO

  Defined at line 46 of file ../../third_party/llvm-libc/src/src/__support/FPUtil/rounding_mode.h

• bool fenv_is_round_to_zero ()

  Quick free-standing test whether fegetround() == FE_TOWARDZERO.

  Using the following observation:

  1.0f + 2^-23 + 2^-24 = 0x1.000002p0f for FE_DOWNWARD, FE_TOWARDZERO

  = 0x1.000004p0f for FE_TONEAREST, FE_UPWARD,

  -1.0f - 2^-24 = -1.0f for FE_TONEAREST, FE_UPWARD, FE_TOWARDZERO

  = -0x1.000002p0f for FE_DOWNWARD

  So:

  (0x1.000002p0f + 2^-24) + (-1.0f - 2^-24) = 2^-23 for FE_TOWARDZERO

  = 2^-22 for FE_TONEAREST, FE_UPWARD

  = 0 for FE_DOWNWARD

  Defined at line 62 of file ../../third_party/llvm-libc/src/src/__support/FPUtil/rounding_mode.h

• int quick_get_round ()

  Quick free standing get rounding mode based on the above observations.

  Defined at line 69 of file ../../third_party/llvm-libc/src/src/__support/FPUtil/rounding_mode.h