diff options
Diffstat (limited to 'arch/sh/kernel/cpu/sh4/softfloat.c')
-rw-r--r-- | arch/sh/kernel/cpu/sh4/softfloat.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh4/softfloat.c b/arch/sh/kernel/cpu/sh4/softfloat.c index 828cb57cb959..2b747f3b02bd 100644 --- a/arch/sh/kernel/cpu/sh4/softfloat.c +++ b/arch/sh/kernel/cpu/sh4/softfloat.c @@ -85,6 +85,7 @@ float64 float64_div(float64 a, float64 b); float32 float32_div(float32 a, float32 b); float32 float32_mul(float32 a, float32 b); float64 float64_mul(float64 a, float64 b); +float32 float64_to_float32(float64 a); inline void add128(bits64 a0, bits64 a1, bits64 b0, bits64 b1, bits64 * z0Ptr, bits64 * z1Ptr); inline void sub128(bits64 a0, bits64 a1, bits64 b0, bits64 b1, bits64 * z0Ptr, @@ -890,3 +891,31 @@ float64 float64_mul(float64 a, float64 b) } return roundAndPackFloat64(zSign, zExp, zSig0); } + +/* + * ------------------------------------------------------------------------------- + * Returns the result of converting the double-precision floating-point value + * `a' to the single-precision floating-point format. The conversion is + * performed according to the IEC/IEEE Standard for Binary Floating-point + * Arithmetic. + * ------------------------------------------------------------------------------- + * */ +float32 float64_to_float32(float64 a) +{ + flag aSign; + int16 aExp; + bits64 aSig; + bits32 zSig; + + aSig = extractFloat64Frac( a ); + aExp = extractFloat64Exp( a ); + aSign = extractFloat64Sign( a ); + + shift64RightJamming( aSig, 22, &aSig ); + zSig = aSig; + if ( aExp || zSig ) { + zSig |= 0x40000000; + aExp -= 0x381; + } + return roundAndPackFloat32(aSign, aExp, zSig); +} |