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// See LICENSE.SoftFloat for license details.
/*** UPDATE COMMENTS. ***/
#include <stdbool.h>
#include <stdint.h>
#include "platform.h"
#include "internals.h"
#include "specialize.h"
#include "softfloat.h"
/*----------------------------------------------------------------------------
| Takes two single-precision floating-point values `a' and `b', one of which
| is a NaN, and returns the appropriate NaN result. If either `a' or `b' is a
| signaling NaN, the invalid exception is raised.
*----------------------------------------------------------------------------*/
uint_fast32_t
softfloat_propagateNaNF32UI( uint_fast32_t uiA, uint_fast32_t uiB )
{
bool isNaNA, isSigNaNA, isNaNB, isSigNaNB;
uint_fast32_t uiMagA, uiMagB;
/*------------------------------------------------------------------------
*------------------------------------------------------------------------*/
isNaNA = isNaNF32UI( uiA );
isSigNaNA = softfloat_isSigNaNF32UI( uiA );
isNaNB = isNaNF32UI( uiB );
isSigNaNB = softfloat_isSigNaNF32UI( uiB );
/*------------------------------------------------------------------------
| Make NaNs non-signaling.
*------------------------------------------------------------------------*/
uiA |= 0x00400000;
uiB |= 0x00400000;
/*------------------------------------------------------------------------
*------------------------------------------------------------------------*/
if ( isSigNaNA | isSigNaNB ) {
softfloat_raiseFlags( softfloat_flag_invalid );
}
if ( isSigNaNA ) {
if ( isSigNaNB ) goto returnLargerSignificand;
return isNaNB ? uiB : uiA;
} else if ( isNaNA ) {
if ( isSigNaNB || ! isNaNB ) return uiA;
returnLargerSignificand:
uiMagA = uiA<<1;
uiMagB = uiB<<1;
if ( uiMagA < uiMagB ) return uiB;
if ( uiMagB < uiMagA ) return uiA;
return ( uiA < uiB ) ? uiA : uiB;
} else {
return uiB;
}
}
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