From: Aurelien Jarno <aurelien@aurel32.net>
Date: Wed, 20 Apr 2011 11:04:23 +0000 (+0200)
Subject: target-i386: add CPU86_LDouble <-> double conversion functions
X-Git-Tag: v0.15.0-rc0~357
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=47c0143cdde080101e97a1b39f3ff13e33b5726c;p=qemu-xen-4.4-testing.git

target-i386: add CPU86_LDouble <-> double conversion functions

Add functions to convert CPU86_LDouble to double and vice versa. They
are going to be used to implement logarithmic and trigonometric function
until softfloat implement them.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---

diff --git a/target-i386/op_helper.c b/target-i386/op_helper.c
index f7cdaaa22..64c0bbf0c 100644
--- a/target-i386/op_helper.c
+++ b/target-i386/op_helper.c
@@ -3431,6 +3431,28 @@ void helper_verw(target_ulong selector1)
 
 /* x87 FPU helpers */
 
+static inline double CPU86_LDouble_to_double(CPU86_LDouble a)
+{
+    union {
+        float64 f64;
+        double d;
+    } u;
+
+    u.f64 = floatx_to_float64(a, &env->fp_status);
+    return u.d;
+}
+
+static inline CPU86_LDouble double_to_CPU86_LDouble(double a)
+{
+    union {
+        float64 f64;
+        double d;
+    } u;
+
+    u.d = a;
+    return float64_to_floatx(u.f64, &env->fp_status);
+}
+
 static void fpu_set_exception(int mask)
 {
     env->fpus |= mask;