| 41 | #include "softfloat.h" |
| 42 | |
| 43 | extFloat80_t |
| 44 | softfloat_roundPackToExtF80( |
| 45 | bool sign, |
| 46 | int_fast32_t exp, |
| 47 | uint_fast64_t sig, |
| 48 | uint_fast64_t sigExtra, |
| 49 | uint_fast8_t roundingPrecision |
| 50 | ) |
| 51 | { |
| 52 | uint_fast8_t roundingMode; |
| 53 | bool roundNearEven; |
| 54 | uint_fast64_t roundIncrement, roundMask, roundBits; |
| 55 | bool isTiny, doIncrement; |
| 56 | struct uint64_extra sig64Extra; |
| 57 | union { struct extFloat80M s; extFloat80_t f; } uZ; |
| 58 | |
| 59 | /*------------------------------------------------------------------------ |
| 60 | *------------------------------------------------------------------------*/ |
| 61 | roundingMode = softfloat_roundingMode; |
| 62 | roundNearEven = (roundingMode == softfloat_round_near_even); |
| 63 | if ( roundingPrecision == 80 ) goto precision80; |
| 64 | if ( roundingPrecision == 64 ) { |
| 65 | roundIncrement = UINT64_C( 0x0000000000000400 ); |
| 66 | roundMask = UINT64_C( 0x00000000000007FF ); |
| 67 | } else if ( roundingPrecision == 32 ) { |
| 68 | roundIncrement = UINT64_C( 0x0000008000000000 ); |
| 69 | roundMask = UINT64_C( 0x000000FFFFFFFFFF ); |
| 70 | } else { |
| 71 | goto precision80; |
| 72 | } |
| 73 | sig |= (sigExtra != 0); |
| 74 | if ( ! roundNearEven && (roundingMode != softfloat_round_near_maxMag) ) { |
| 75 | roundIncrement = |
| 76 | (roundingMode |
| 77 | == (sign ? softfloat_round_min : softfloat_round_max)) |
| 78 | ? roundMask |
| 79 | : 0; |
| 80 | } |
| 81 | roundBits = sig & roundMask; |
| 82 | /*------------------------------------------------------------------------ |
| 83 | *------------------------------------------------------------------------*/ |
| 84 | if ( 0x7FFD <= (uint32_t) (exp - 1) ) { |
| 85 | if ( exp <= 0 ) { |
| 86 | /*---------------------------------------------------------------- |
| 87 | *----------------------------------------------------------------*/ |
| 88 | isTiny = |
| 89 | (softfloat_detectTininess |
| 90 | == softfloat_tininess_beforeRounding) |
| 91 | || (exp < 0) |
| 92 | || (sig <= (uint64_t) (sig + roundIncrement)); |
| 93 | sig = softfloat_shiftRightJam64( sig, 1 - exp ); |
| 94 | roundBits = sig & roundMask; |
| 95 | if ( roundBits ) { |
| 96 | if ( isTiny ) softfloat_raiseFlags( softfloat_flag_underflow ); |
| 97 | softfloat_exceptionFlags |= softfloat_flag_inexact; |
| 98 | #ifdef SOFTFLOAT_ROUND_ODD |
| 99 | if ( roundingMode == softfloat_round_odd ) { |
| 100 | sig |= roundMask + 1; |
no test coverage detected