Module rustc_apfloat::ieee::sig

Implementation details of IeeeFloat significands, such as big integer arithmetic. As a rule of thumb, no functions in this module should dynamically allocate.

Functions

• add 🔒
  a += b + c where c is zero or one. Returns the carry flag.
• add_or_sub 🔒
  a += b or a -= b. Does not preserve b.
• clear_bit 🔒
  Clear the given bit.
• cmp 🔒
  Comparison (unsigned) of two significands.
• decrement 🔒
  Decrement in-place, return the borrow flag.
• div 🔒
  quotient = dividend / divisor. Returns the lost fraction. Does not preserve dividend or divisor.
• each_chunk 🔒
  For every consecutive chunk of bits bits from limbs, going from most significant to the least significant bits, call f to transform those bits and store the result back.
• extract 🔒
  Copies the bit vector of width src_bits from src, starting at bit SRC_LSB, to dst, such that the bit SRC_LSB becomes the least significant bit of dst. All high bits above src_bits in dst are zero-filled.
• from_limbs 🔒
  We want the most significant PRECISION bits of src. There may not be that many; extract what we can.
• get_bit 🔒
  Extracts the given bit.
• increment 🔒
  Increment in-place, return the carry flag.
• is_all_zeros 🔒
• mul 🔒
  dst = a * b (for normal a and b). Returns the lost fraction.
• olsb 🔒
  One, not zero, based LSB. That is, returns 0 for a zeroed significand.
• omsb 🔒
  One, not zero, based MSB. That is, returns 0 for a zeroed significand.
• set_bit 🔒
  Sets the given bit.
• shift_left 🔒
  Shifts dst left bits bits, subtract bits from its exponent.
• shift_right 🔒
  Shifts dst right bits bits noting lost fraction.
• sub 🔒
  a -= b + c where c is zero or one. Returns the borrow flag.
• widening_mul 🔒
  [low, high] = a * b.