[Qemu-devel] [PATCH 08/11] target-i386: cleanup helper_fxam_ST0()

[Aurelien Jarno]

Rewrite helper_fxam_ST0() using only softfloat functions.

Signed-off-by: Aurelien Jarno <aurel...@aurel32.net>
---
 target-i386/op_helper.c |   30 ++++++++++++------------------
 1 files changed, 12 insertions(+), 18 deletions(-)

diff --git a/target-i386/op_helper.c b/target-i386/op_helper.c
index cec0c76..8ba2b5f 100644
--- a/target-i386/op_helper.c
+++ b/target-i386/op_helper.c
@@ -4241,29 +4241,23 @@ void helper_fcos(void)
 
 void helper_fxam_ST0(void)
 {
-    CPU_LDoubleU temp;
-    int expdif;
-
-    temp.d = ST0;
-
     env->fpus &= (~0x4700);  /* (C3,C2,C1,C0) <-- 0000 */
-    if (SIGND(temp))
+
+    if (floatx80_is_neg(ST0)) {
         env->fpus |= 0x200; /* C1 <-- 1 */
+    }
 
     /* XXX: test fptags too */
-    expdif = EXPD(temp);
-    if (expdif == MAXEXPD) {
-        if (MANTD(temp) == 0x8000000000000000ULL)
-            env->fpus |=  0x500 /*Infinity*/;
-        else
-            env->fpus |=  0x100 /*NaN*/;
-    } else if (expdif == 0) {
-        if (MANTD(temp) == 0)
-            env->fpus |=  0x4000 /*Zero*/;
-        else
-            env->fpus |= 0x4400 /*Denormal*/;
+    if (floatx80_is_infinity(ST0)) {
+        env->fpus |=  0x500; /* (C3,C2,C0) <-- 011 */
+    } else if (floatx80_is_any_nan(ST0)) {
+        env->fpus |=  0x100; /* (C3,C2,C0) <-- 001 */
+    } else if (floatx80_is_zero(ST0)) {
+        env->fpus |= 0x4000; /* (C3,C2,C0) <-- 100 */
+    } else if (floatx80_is_zero_or_denormal(ST0)) {
+        env->fpus |= 0x4400; /* (C3,C2,C0) <-- 110 */
     } else {
-        env->fpus |= 0x400;
+        env->fpus |=  0x400; /* (C3,C2,C0) <-- 010 */
     }
 }
 
-- 
1.7.2.3