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Diffstat (limited to 'arch/sh/kernel/cpu/sh4/softfloat.c')
-rw-r--r--arch/sh/kernel/cpu/sh4/softfloat.c29
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);
+}