| 41 | #include "softfloat.h" |
| 42 | |
| 43 | float64_sf |
| 44 | softfloat_roundPackToF64( bool sign, int_fast16_t exp, uint_fast64_t sig ) |
| 45 | { |
| 46 | uint_fast8_t roundingMode; |
| 47 | bool roundNearEven; |
| 48 | uint_fast16_t roundIncrement, roundBits; |
| 49 | bool isTiny; |
| 50 | uint_fast64_t uiZ; |
| 51 | union ui64_f64 uZ; |
| 52 | |
| 53 | /*------------------------------------------------------------------------ |
| 54 | *------------------------------------------------------------------------*/ |
| 55 | roundingMode = softfloat_roundingMode; |
| 56 | roundNearEven = (roundingMode == softfloat_round_near_even); |
| 57 | roundIncrement = 0x200; |
| 58 | if ( ! roundNearEven && (roundingMode != softfloat_round_near_maxMag) ) { |
| 59 | roundIncrement = |
| 60 | (roundingMode |
| 61 | == (sign ? softfloat_round_min : softfloat_round_max)) |
| 62 | ? 0x3FF |
| 63 | : 0; |
| 64 | } |
| 65 | roundBits = sig & 0x3FF; |
| 66 | /*------------------------------------------------------------------------ |
| 67 | *------------------------------------------------------------------------*/ |
| 68 | if ( 0x7FD <= (uint16_t) exp ) { |
| 69 | if ( exp < 0 ) { |
| 70 | /*---------------------------------------------------------------- |
| 71 | *----------------------------------------------------------------*/ |
| 72 | isTiny = |
| 73 | (softfloat_detectTininess == softfloat_tininess_beforeRounding) |
| 74 | || (exp < -1) |
| 75 | || (sig + roundIncrement < UINT64_C( 0x8000000000000000 )); |
| 76 | sig = softfloat_shiftRightJam64( sig, -exp ); |
| 77 | exp = 0; |
| 78 | roundBits = sig & 0x3FF; |
| 79 | if ( isTiny && roundBits ) { |
| 80 | softfloat_raiseFlags( softfloat_flag_underflow ); |
| 81 | } |
| 82 | } else if ( |
| 83 | (0x7FD < exp) |
| 84 | || (UINT64_C( 0x8000000000000000 ) <= sig + roundIncrement) |
| 85 | ) { |
| 86 | /*---------------------------------------------------------------- |
| 87 | *----------------------------------------------------------------*/ |
| 88 | softfloat_raiseFlags( |
| 89 | softfloat_flag_overflow | softfloat_flag_inexact ); |
| 90 | uiZ = packToF64UI( sign, 0x7FF, 0 ) - ! roundIncrement; |
| 91 | goto uiZ; |
| 92 | } |
| 93 | } |
| 94 | /*------------------------------------------------------------------------ |
| 95 | *------------------------------------------------------------------------*/ |
| 96 | sig = (sig + roundIncrement)>>10; |
| 97 | if ( roundBits ) { |
| 98 | softfloat_exceptionFlags |= softfloat_flag_inexact; |
| 99 | #ifdef SOFTFLOAT_ROUND_ODD |
| 100 | if ( roundingMode == softfloat_round_odd ) { |
no test coverage detected