From 1e163c715550e20e239976a22e00869884713e54 Mon Sep 17 00:00:00 2001 From: Andrew Waterman Date: Sun, 19 Jun 2011 21:45:58 -0700 Subject: fixed build after repo split --- softfloat/f32_roundToInt.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100755 softfloat/f32_roundToInt.c (limited to 'softfloat/f32_roundToInt.c') diff --git a/softfloat/f32_roundToInt.c b/softfloat/f32_roundToInt.c new file mode 100755 index 0000000..f8f9114 --- /dev/null +++ b/softfloat/f32_roundToInt.c @@ -0,0 +1,78 @@ + +#include +#include +#include "platform.h" +#include "internals.h" +#include "specialize.h" +#include "softfloat.h" + +float32_t f32_roundToInt( float32_t a, int_fast8_t roundingMode, bool exact ) +{ + union ui32_f32 uA; + uint_fast32_t uiA; + int_fast16_t expA; + uint_fast32_t uiZ; + bool signA; + uint_fast32_t lastBitMask, roundBitsMask; + union ui32_f32 uZ; + + uA.f = a; + uiA = uA.ui; + expA = expF32UI( uiA ); + if ( 0x96 <= expA ) { + if ( ( expA == 0xFF ) && fracF32UI( uiA ) ) { + uiZ = softfloat_propagateNaNF32UI( uiA, 0 ); + goto uiZ; + } + return a; + } + if ( expA <= 0x7E ) { + if ( ! (uint32_t) ( uiA<<1 ) ) return a; + if ( exact ) softfloat_exceptionFlags |= softfloat_flag_inexact; + signA = signF32UI( uiA ); + switch ( roundingMode ) { + case softfloat_round_nearest_even: + if ( ( expA == 0x7E ) && fracF32UI( uiA ) ) { + uiZ = packToF32UI( signA, 0x7F, 0 ); + goto uiZ; + } + break; + case softfloat_round_min: + uiZ = signA ? 0xBF800000 : 0; + goto uiZ; + case softfloat_round_max: + uiZ = signA ? 0x80000000 : 0x3F800000; + goto uiZ; + case softfloat_round_nearest_maxMag: + if ( expA == 0x7E ) { + uiZ = packToF32UI( signA, 0x7F, 0 ); + goto uiZ; + } + break; + } + uiZ = packToF32UI( signA, 0, 0 ); + goto uiZ; + } + lastBitMask = (uint_fast32_t) 1<<( 0x96 - expA ); + roundBitsMask = lastBitMask - 1; + uiZ = uiA; + if ( roundingMode == softfloat_round_nearest_maxMag ) { + uiZ += lastBitMask>>1; + } else if ( roundingMode == softfloat_round_nearest_even ) { + uiZ += lastBitMask>>1; + if ( ! ( uiZ & roundBitsMask ) ) uiZ &= ~ lastBitMask; + } else if ( roundingMode != softfloat_round_minMag ) { + if ( signF32UI( uiZ ) ^ ( roundingMode == softfloat_round_max ) ) { + uiZ += roundBitsMask; + } + } + uiZ &= ~ roundBitsMask; + if ( exact && ( uiZ != uiA ) ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; + } + uiZ: + uZ.ui = uiZ; + return uZ.f; + +} + -- cgit v1.1