From 4e8e8572c35a2812b643f2cdeec8473dd866a3e3 Mon Sep 17 00:00:00 2001
From: Laurent Vivier <laurent@vivier.eu>
Date: Sat, 3 Mar 2018 20:57:25 -0500
Subject: [PATCH] softfloat: define floatx80_round()

Add a function to round a floatx80 to the defined precision
(floatx80_rounding_precision)

Backports commit 0f72129281765ed64d26353284059f2bdcde7a23 from qemu
---
 qemu/fpu/softfloat.c         | 16 ++++++++++++++++
 qemu/include/fpu/softfloat.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/qemu/fpu/softfloat.c b/qemu/fpu/softfloat.c
index cb27ec6e..8a325bc2 100644
--- a/qemu/fpu/softfloat.c
+++ b/qemu/fpu/softfloat.c
@@ -5046,6 +5046,22 @@ float128 floatx80_to_float128(floatx80 a, float_status *status)
 
 }
 
+/*----------------------------------------------------------------------------
+| Rounds the extended double-precision floating-point value `a'
+| to the precision provided by floatx80_rounding_precision and returns the
+| result as an extended double-precision floating-point value.
+| The operation is performed according to the IEC/IEEE Standard for Binary
+| Floating-Point Arithmetic.
+*----------------------------------------------------------------------------*/
+
+floatx80 floatx80_round(floatx80 a, float_status *status)
+{
+    return roundAndPackFloatx80(status->floatx80_rounding_precision,
+                                extractFloatx80Sign(a),
+                                extractFloatx80Exp(a),
+                                extractFloatx80Frac(a), 0, status);
+}
+
 /*----------------------------------------------------------------------------
 | Rounds the extended double-precision floating-point value `a' to an integer,
 | and returns the result as an extended quadruple-precision floating-point
diff --git a/qemu/include/fpu/softfloat.h b/qemu/include/fpu/softfloat.h
index 13912a67..b2121abc 100644
--- a/qemu/include/fpu/softfloat.h
+++ b/qemu/include/fpu/softfloat.h
@@ -608,6 +608,7 @@ float128 floatx80_to_float128(floatx80, float_status *status);
 /*----------------------------------------------------------------------------
 | Software IEC/IEEE extended double-precision operations.
 *----------------------------------------------------------------------------*/
+floatx80 floatx80_round(floatx80 a, float_status *status);
 floatx80 floatx80_round_to_int(floatx80, float_status *status);
 floatx80 floatx80_add(floatx80, floatx80, float_status *status);
 floatx80 floatx80_sub(floatx80, floatx80, float_status *status);