Implement float128_to_uint64() and use that to implement
float128_to_uint64_round_to_zero()
This is required by xscvqpudz instruction of PowerPC ISA 3.0.
Signed-off-by: Bharata B Rao <bhar...@linux.vnet.ibm.com>
---
fpu/softfloat.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++
include/fpu/softfloat.h | 2 ++
2 files changed, 67 insertions(+)
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index c295f31..49a06c5 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -6110,6 +6110,71 @@ int64_t float128_to_int64_round_to_zero(float128 a,
float_status *status)
/*----------------------------------------------------------------------------
| Returns the result of converting the quadruple-precision floating-point
+| value `a' to the 64-bit unsigned integer format. The conversion
+| is performed according to the IEC/IEEE Standard for Binary Floating-Point
+| Arithmetic---which means in particular that the conversion is rounded
+| according to the current rounding mode. If `a' is a NaN, the largest
+| positive integer is returned. Otherwise, if the conversion overflows, the
+| largest unsigned integer is returned. If 'a' is negative, the value is
+| rounded and zero is returned; negative values that do not round to zero
+| will raise the inexact exception.
+*----------------------------------------------------------------------------*/
+
+uint64_t float128_to_uint64(float128 a, float_status *status)
+{
+ flag aSign;
+ int32_t aExp, shiftCount;
+ uint64_t aSig0, aSig1;
+
+ aSig1 = extractFloat128Frac1( a );
+ aSig0 = extractFloat128Frac0( a );
+ aExp = extractFloat128Exp( a );
+ aSign = extractFloat128Sign( a );
+ if ( aExp ) aSig0 |= LIT64( 0x0001000000000000 );
+ shiftCount = 0x402F - aExp;
+ if ( shiftCount <= 0 ) {
+ if ( 0x403E < aExp ) {
+ float_raise(float_flag_invalid, status);
+ if ( ! aSign
+ || ( ( aExp == 0x7FFF )
+ && ( aSig1 || ( aSig0 != LIT64( 0x0001000000000000 ) ) )
+ )
+ ) {
+ return LIT64( 0xFFFFFFFFFFFFFFFF );
+ }
+ return 0;
+ }
+ shortShift128Left( aSig0, aSig1, - shiftCount, &aSig0, &aSig1 );
+ }
+ else {
+ shift64ExtraRightJamming( aSig0, aSig1, shiftCount, &aSig0, &aSig1 );
+ }
+ return roundAndPackUint64(aSign, aSig0, aSig1, status);
+}
+
+/*----------------------------------------------------------------------------
+| Returns the result of converting the quadruple-precision floating-point
+| value `a' to the 64-bit unsigned integer format. The conversion
+| is performed according to the IEC/IEEE Standard for Binary Floating-Point
+| Arithmetic, except that the conversion is always rounded toward zero.
+| according to the current rounding mode. If `a' is a NaN, the largest
+| positive integer is returned. Otherwise, if the conversion overflows, the
+| largest unsigned integer is returned. If 'a' is negative, the value is
+| rounded and zero is returned; negative values that do not round to zero
+| will raise the inexact exception.
+*----------------------------------------------------------------------------*/
+
+uint64_t float128_to_uint64_round_to_zero(float128 a, float_status *status)
+{
+ signed char current_rounding_mode = status->float_rounding_mode;
+ set_float_rounding_mode(float_round_to_zero, status);
+ uint64_t v = float128_to_uint64(a, status);
+ set_float_rounding_mode(current_rounding_mode, status);
+ return v;
+}
+
+/*----------------------------------------------------------------------------
+| Returns the result of converting the quadruple-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.
diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h
index 842ec6b..4e99253 100644
--- a/include/fpu/softfloat.h
+++ b/include/fpu/softfloat.h
@@ -712,6 +712,8 @@ int32_t float128_to_int32(float128, float_status *status);
int32_t float128_to_int32_round_to_zero(float128, float_status *status);
int64_t float128_to_int64(float128, float_status *status);
int64_t float128_to_int64_round_to_zero(float128, float_status *status);
+uint64_t float128_to_uint64(float128, float_status *status);
+uint64_t float128_to_uint64_round_to_zero(float128, float_status *status);
float32 float128_to_float32(float128, float_status *status);
float64 float128_to_float64(float128, float_status *status);
floatx80 float128_to_floatx80(float128, float_status *status);
--
2.7.4
