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[v2,16/20] target-i386: add CPU86_LDouble <-> double conversion functions

Message ID 1303294329-22634-17-git-send-email-aurelien@aurel32.net
State New
Headers show

Commit Message

Aurelien Jarno April 20, 2011, 10:12 a.m. UTC 
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>
---
 target-i386/op_helper.c |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)
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Patch

diff --git a/target-i386/op_helper.c b/target-i386/op_helper.c
index b47d825..d9c8c1b 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;