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Fix NaN handling for MIPS and HPPA.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3655 c046a42c-6fe2-441c-8c8c-71466251a162
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@ -30,6 +30,12 @@ these four paragraphs for those parts of this code that are retained.
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=============================================================================*/
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#if defined(TARGET_MIPS) || defined(TARGET_HPPA)
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#define SNAN_BIT_IS_ONE 1
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#else
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#define SNAN_BIT_IS_ONE 0
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#endif
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/*----------------------------------------------------------------------------
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| Underflow tininess-detection mode, statically initialized to default value.
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| (The declaration in `softfloat.h' must match the `int8' type here.)
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@ -45,9 +51,7 @@ int8 float_detect_tininess = float_tininess_after_rounding;
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void float_raise( int8 flags STATUS_PARAM )
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{
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STATUS(float_exception_flags) |= flags;
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}
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/*----------------------------------------------------------------------------
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@ -61,20 +65,20 @@ typedef struct {
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/*----------------------------------------------------------------------------
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| The pattern for a default generated single-precision NaN.
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*----------------------------------------------------------------------------*/
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#if defined(TARGET_MIPS) || defined(TARGET_HPPA)
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#define float32_default_nan 0xFF800000
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#if SNAN_BIT_IS_ONE
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#define float32_default_nan 0x7FBFFFFF
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#else
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#define float32_default_nan 0xFFC00000
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#endif
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/*----------------------------------------------------------------------------
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| Returns 1 if the single-precision floating-point value `a' is a NaN;
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| otherwise returns 0.
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| Returns 1 if the single-precision floating-point value `a' is a quiet
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| NaN; otherwise returns 0.
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*----------------------------------------------------------------------------*/
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int float32_is_nan( float32 a )
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{
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#if defined(TARGET_MIPS) || defined(TARGET_HPPA)
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#if SNAN_BIT_IS_ONE
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return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF );
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#else
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return ( 0xFF800000 <= (bits32) ( a<<1 ) );
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@ -88,7 +92,7 @@ int float32_is_nan( float32 a )
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int float32_is_signaling_nan( float32 a )
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{
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#if defined(TARGET_MIPS) || defined(TARGET_HPPA)
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#if SNAN_BIT_IS_ONE
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return ( 0xFF800000 <= (bits32) ( a<<1 ) );
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#else
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return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF );
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@ -110,7 +114,6 @@ static commonNaNT float32ToCommonNaN( float32 a STATUS_PARAM )
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z.low = 0;
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z.high = ( (bits64) a )<<41;
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return z;
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}
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/*----------------------------------------------------------------------------
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@ -120,9 +123,7 @@ static commonNaNT float32ToCommonNaN( float32 a STATUS_PARAM )
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static float32 commonNaNToFloat32( commonNaNT a )
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{
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return ( ( (bits32) a.sign )<<31 ) | 0x7FC00000 | ( a.high>>41 );
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}
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/*----------------------------------------------------------------------------
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@ -139,7 +140,7 @@ static float32 propagateFloat32NaN( float32 a, float32 b STATUS_PARAM)
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aIsSignalingNaN = float32_is_signaling_nan( a );
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bIsNaN = float32_is_nan( b );
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bIsSignalingNaN = float32_is_signaling_nan( b );
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#if defined(TARGET_MIPS) || defined(TARGET_HPPA)
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#if SNAN_BIT_IS_ONE
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a &= ~0x00400000;
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b &= ~0x00400000;
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#else
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@ -161,26 +162,25 @@ static float32 propagateFloat32NaN( float32 a, float32 b STATUS_PARAM)
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else {
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return b;
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}
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}
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/*----------------------------------------------------------------------------
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| The pattern for a default generated double-precision NaN.
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*----------------------------------------------------------------------------*/
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#if defined(TARGET_MIPS) || defined(TARGET_HPPA)
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#define float64_default_nan LIT64( 0xFFF0000000000000 )
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#if SNAN_BIT_IS_ONE
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#define float64_default_nan LIT64( 0x7FF7FFFFFFFFFFFF )
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#else
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#define float64_default_nan LIT64( 0xFFF8000000000000 )
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#endif
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/*----------------------------------------------------------------------------
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| Returns 1 if the double-precision floating-point value `a' is a NaN;
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| otherwise returns 0.
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| Returns 1 if the double-precision floating-point value `a' is a quiet
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| NaN; otherwise returns 0.
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*----------------------------------------------------------------------------*/
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int float64_is_nan( float64 a )
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{
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#if defined(TARGET_MIPS) || defined(TARGET_HPPA)
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#if SNAN_BIT_IS_ONE
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return
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( ( ( a>>51 ) & 0xFFF ) == 0xFFE )
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&& ( a & LIT64( 0x0007FFFFFFFFFFFF ) );
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@ -196,7 +196,7 @@ int float64_is_nan( float64 a )
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int float64_is_signaling_nan( float64 a )
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{
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#if defined(TARGET_MIPS) || defined(TARGET_HPPA)
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#if SNAN_BIT_IS_ONE
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return ( LIT64( 0xFFF0000000000000 ) <= (bits64) ( a<<1 ) );
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#else
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return
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@ -220,7 +220,6 @@ static commonNaNT float64ToCommonNaN( float64 a STATUS_PARAM)
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z.low = 0;
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z.high = a<<12;
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return z;
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}
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/*----------------------------------------------------------------------------
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@ -230,12 +229,10 @@ static commonNaNT float64ToCommonNaN( float64 a STATUS_PARAM)
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static float64 commonNaNToFloat64( commonNaNT a )
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{
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return
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( ( (bits64) a.sign )<<63 )
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| LIT64( 0x7FF8000000000000 )
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| ( a.high>>12 );
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}
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/*----------------------------------------------------------------------------
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@ -252,7 +249,7 @@ static float64 propagateFloat64NaN( float64 a, float64 b STATUS_PARAM)
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aIsSignalingNaN = float64_is_signaling_nan( a );
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bIsNaN = float64_is_nan( b );
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bIsSignalingNaN = float64_is_signaling_nan( b );
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#if defined(TARGET_MIPS) || defined(TARGET_HPPA)
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#if SNAN_BIT_IS_ONE
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a &= ~LIT64( 0x0008000000000000 );
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b &= ~LIT64( 0x0008000000000000 );
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#else
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@ -274,7 +271,6 @@ static float64 propagateFloat64NaN( float64 a, float64 b STATUS_PARAM)
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else {
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return b;
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}
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}
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#ifdef FLOATX80
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@ -284,19 +280,32 @@ static float64 propagateFloat64NaN( float64 a, float64 b STATUS_PARAM)
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| `high' and `low' values hold the most- and least-significant bits,
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| respectively.
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*----------------------------------------------------------------------------*/
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#if SNAN_BIT_IS_ONE
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#define floatx80_default_nan_high 0x7FFF
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#define floatx80_default_nan_low LIT64( 0xBFFFFFFFFFFFFFFF )
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#else
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#define floatx80_default_nan_high 0xFFFF
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#define floatx80_default_nan_low LIT64( 0xC000000000000000 )
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#endif
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/*----------------------------------------------------------------------------
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| Returns 1 if the extended double-precision floating-point value `a' is a
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| NaN; otherwise returns 0.
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| quiet NaN; otherwise returns 0.
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*----------------------------------------------------------------------------*/
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int floatx80_is_nan( floatx80 a )
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{
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#if SNAN_BIT_IS_ONE
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bits64 aLow;
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aLow = a.low & ~ LIT64( 0x4000000000000000 );
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return
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( ( a.high & 0x7FFF ) == 0x7FFF )
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&& (bits64) ( aLow<<1 )
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&& ( a.low == aLow );
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#else
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return ( ( a.high & 0x7FFF ) == 0x7FFF ) && (bits64) ( a.low<<1 );
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#endif
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}
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/*----------------------------------------------------------------------------
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@ -306,6 +315,9 @@ int floatx80_is_nan( floatx80 a )
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int floatx80_is_signaling_nan( floatx80 a )
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{
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#if SNAN_BIT_IS_ONE
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return ( ( a.high & 0x7FFF ) == 0x7FFF ) && (bits64) ( a.low<<1 );
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#else
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bits64 aLow;
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aLow = a.low & ~ LIT64( 0x4000000000000000 );
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@ -313,7 +325,7 @@ int floatx80_is_signaling_nan( floatx80 a )
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( ( a.high & 0x7FFF ) == 0x7FFF )
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&& (bits64) ( aLow<<1 )
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&& ( a.low == aLow );
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#endif
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}
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/*----------------------------------------------------------------------------
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@ -331,7 +343,6 @@ static commonNaNT floatx80ToCommonNaN( floatx80 a STATUS_PARAM)
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z.low = 0;
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z.high = a.low<<1;
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return z;
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}
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/*----------------------------------------------------------------------------
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@ -346,7 +357,6 @@ static floatx80 commonNaNToFloatx80( commonNaNT a )
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z.low = LIT64( 0xC000000000000000 ) | ( a.high>>1 );
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z.high = ( ( (bits16) a.sign )<<15 ) | 0x7FFF;
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return z;
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}
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/*----------------------------------------------------------------------------
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@ -363,8 +373,13 @@ static floatx80 propagateFloatx80NaN( floatx80 a, floatx80 b STATUS_PARAM)
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aIsSignalingNaN = floatx80_is_signaling_nan( a );
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bIsNaN = floatx80_is_nan( b );
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bIsSignalingNaN = floatx80_is_signaling_nan( b );
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#if SNAN_BIT_IS_ONE
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a.low &= ~LIT64( 0xC000000000000000 );
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b.low &= ~LIT64( 0xC000000000000000 );
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#else
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a.low |= LIT64( 0xC000000000000000 );
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b.low |= LIT64( 0xC000000000000000 );
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#endif
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if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid STATUS_VAR);
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if ( aIsSignalingNaN ) {
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if ( bIsSignalingNaN ) goto returnLargerSignificand;
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@ -380,7 +395,6 @@ static floatx80 propagateFloatx80NaN( floatx80 a, floatx80 b STATUS_PARAM)
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else {
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return b;
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}
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}
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#endif
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@ -391,21 +405,30 @@ static floatx80 propagateFloatx80NaN( floatx80 a, floatx80 b STATUS_PARAM)
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| The pattern for a default generated quadruple-precision NaN. The `high' and
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| `low' values hold the most- and least-significant bits, respectively.
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*----------------------------------------------------------------------------*/
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#if SNAN_BIT_IS_ONE
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#define float128_default_nan_high LIT64( 0x7FFF7FFFFFFFFFFF )
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#define float128_default_nan_low LIT64( 0xFFFFFFFFFFFFFFFF )
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#else
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#define float128_default_nan_high LIT64( 0xFFFF800000000000 )
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#define float128_default_nan_low LIT64( 0x0000000000000000 )
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#endif
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/*----------------------------------------------------------------------------
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| Returns 1 if the quadruple-precision floating-point value `a' is a NaN;
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| otherwise returns 0.
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| Returns 1 if the quadruple-precision floating-point value `a' is a quiet
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| NaN; otherwise returns 0.
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*----------------------------------------------------------------------------*/
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int float128_is_nan( float128 a )
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{
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#if SNAN_BIT_IS_ONE
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return
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( ( ( a.high>>47 ) & 0xFFFF ) == 0xFFFE )
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&& ( a.low || ( a.high & LIT64( 0x00007FFFFFFFFFFF ) ) );
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#else
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return
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( LIT64( 0xFFFE000000000000 ) <= (bits64) ( a.high<<1 ) )
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&& ( a.low || ( a.high & LIT64( 0x0000FFFFFFFFFFFF ) ) );
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#endif
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}
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/*----------------------------------------------------------------------------
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@ -415,11 +438,15 @@ int float128_is_nan( float128 a )
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int float128_is_signaling_nan( float128 a )
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{
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#if SNAN_BIT_IS_ONE
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return
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( LIT64( 0xFFFE000000000000 ) <= (bits64) ( a.high<<1 ) )
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&& ( a.low || ( a.high & LIT64( 0x0000FFFFFFFFFFFF ) ) );
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#else
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return
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( ( ( a.high>>47 ) & 0xFFFF ) == 0xFFFE )
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&& ( a.low || ( a.high & LIT64( 0x00007FFFFFFFFFFF ) ) );
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#endif
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}
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/*----------------------------------------------------------------------------
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@ -436,7 +463,6 @@ static commonNaNT float128ToCommonNaN( float128 a STATUS_PARAM)
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z.sign = a.high>>63;
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shortShift128Left( a.high, a.low, 16, &z.high, &z.low );
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return z;
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}
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/*----------------------------------------------------------------------------
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@ -451,7 +477,6 @@ static float128 commonNaNToFloat128( commonNaNT a )
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shift128Right( a.high, a.low, 16, &z.high, &z.low );
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z.high |= ( ( (bits64) a.sign )<<63 ) | LIT64( 0x7FFF800000000000 );
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return z;
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}
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/*----------------------------------------------------------------------------
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@ -468,8 +493,13 @@ static float128 propagateFloat128NaN( float128 a, float128 b STATUS_PARAM)
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aIsSignalingNaN = float128_is_signaling_nan( a );
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bIsNaN = float128_is_nan( b );
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bIsSignalingNaN = float128_is_signaling_nan( b );
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#if SNAN_BIT_IS_ONE
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a.high &= ~LIT64( 0x0000800000000000 );
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b.high &= ~LIT64( 0x0000800000000000 );
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#else
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a.high |= LIT64( 0x0000800000000000 );
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b.high |= LIT64( 0x0000800000000000 );
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#endif
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if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid STATUS_VAR);
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if ( aIsSignalingNaN ) {
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if ( bIsSignalingNaN ) goto returnLargerSignificand;
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@ -485,8 +515,6 @@ static float128 propagateFloat128NaN( float128 a, float128 b STATUS_PARAM)
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else {
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return b;
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}
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}
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#endif
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