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authorTom Musta <tommusta@gmail.com>2014-03-31 16:03:55 -0500
committerAlexander Graf <agraf@suse.de>2014-04-08 11:20:00 +0200
commita13d44896854329581ba48607d66c6b2aec157f7 (patch)
tree555b40a36f9607973793a332e694a16c833d10c9
parent3636226ae45a9b04af5202a18f445680c88473e7 (diff)
downloadqemu-arm-a13d44896854329581ba48607d66c6b2aec157f7.tar.gz
softfloat: Introduce float32_to_uint64_round_to_zero
This change adds the float32_to_uint64_round_to_zero function to the softfloat library. This function fills out the complement of float32 to INT round-to-zero conversion rountines, where INT is {int32_t, uint32_t, int64_t, uint64_t}. This contribution can be licensed under either the softfloat-2a or -2b license. Signed-off-by: Tom Musta <tommusta@gmail.com> Tested-by: Tom Musta <tommusta@gmail.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Alexander Graf <agraf@suse.de>
-rw-r--r--fpu/softfloat.c20
-rw-r--r--include/fpu/softfloat.h1
2 files changed, 21 insertions, 0 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 5f02c16d8d..e00a6fbca6 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -1628,6 +1628,26 @@ uint64 float32_to_uint64(float32 a STATUS_PARAM)
/*----------------------------------------------------------------------------
| Returns the result of converting the single-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. If
+| `a' is a NaN, the largest unsigned integer is returned. Otherwise, if the
+| conversion overflows, the largest unsigned integer is returned. If the
+| 'a' is negative, the result is rounded and zero is returned; values that do
+| not round to zero will raise the inexact flag.
+*----------------------------------------------------------------------------*/
+
+uint64 float32_to_uint64_round_to_zero(float32 a STATUS_PARAM)
+{
+ signed char current_rounding_mode = STATUS(float_rounding_mode);
+ set_float_rounding_mode(float_round_to_zero STATUS_VAR);
+ int64_t v = float32_to_uint64(a STATUS_VAR);
+ set_float_rounding_mode(current_rounding_mode STATUS_VAR);
+ return v;
+}
+
+/*----------------------------------------------------------------------------
+| Returns the result of converting the single-precision floating-point value
| `a' to the 64-bit two's complement 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. If
diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h
index db878c1313..4b3090ca74 100644
--- a/include/fpu/softfloat.h
+++ b/include/fpu/softfloat.h
@@ -342,6 +342,7 @@ uint32 float32_to_uint32( float32 STATUS_PARAM );
uint32 float32_to_uint32_round_to_zero( float32 STATUS_PARAM );
int64 float32_to_int64( float32 STATUS_PARAM );
uint64 float32_to_uint64(float32 STATUS_PARAM);
+uint64 float32_to_uint64_round_to_zero(float32 STATUS_PARAM);
int64 float32_to_int64_round_to_zero( float32 STATUS_PARAM );
float64 float32_to_float64( float32 STATUS_PARAM );
floatx80 float32_to_floatx80( float32 STATUS_PARAM );