[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [V2 PATCH 1/9] softfloat: Introduce float32_to_uint64_round
From: |
Tom Musta |
Subject: |
[Qemu-devel] [V2 PATCH 1/9] softfloat: Introduce float32_to_uint64_round_to_zero |
Date: |
Mon, 31 Mar 2014 16:03:55 -0500 |
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 <address@hidden>
Tested-by: Tom Musta <address@hidden>
---
V2: Simplified code per Peter Maydell's review.
fpu/softfloat.c | 20 ++++++++++++++++++++
include/fpu/softfloat.h | 1 +
2 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 5f02c16..e00a6fb 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 db878c1..4b3090c 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 );
--
1.7.1
- [Qemu-devel] [V2 PATCH 0/9] target-ppc: VSX Bug Fixes, Tom Musta, 2014/03/31
- [Qemu-devel] [V2 PATCH 1/9] softfloat: Introduce float32_to_uint64_round_to_zero,
Tom Musta <=
- [Qemu-devel] [V2 PATCH 2/9] target-ppc: Bug: VSX Convert to Integer Should Truncate, Tom Musta, 2014/03/31
- [Qemu-devel] [V2 PATCH 3/9] target-ppc: Define Endian-Correct Accessors for VSR Field Acess, Tom Musta, 2014/03/31
- [Qemu-devel] [V2 PATCH 4/9] target-ppc: Correct LE Host Inversion of Lower VSRs, Tom Musta, 2014/03/31
- [Qemu-devel] [V2 PATCH 5/9] target-ppc: Correct Simple VSR LE Host Inversions, Tom Musta, 2014/03/31
- [Qemu-devel] [V2 PATCH 6/9] target-ppc: Correct VSX Scalar Compares, Tom Musta, 2014/03/31
- [Qemu-devel] [V2 PATCH 8/9] target-ppc: Correct VSX FP to Integer Conversion, Tom Musta, 2014/03/31
- [Qemu-devel] [V2 PATCH 9/9] target-ppc: Correct VSX Integer to FP Conversion, Tom Musta, 2014/03/31
- [Qemu-devel] [V2 PATCH 7/9] target-ppc: Correct VSX FP to FP Conversions, Tom Musta, 2014/03/31