target-ppc: fix mtfsb0 and mtfsb1

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6032 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 18 insertions, 0 deletions

diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index cd88bb6075..a46c00c9d7 100644
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -843,6 +843,24 @@ static always_inline void fpscr_set_rounding_mode (void)
     set_float_rounding_mode(rnd_type, &env->fp_status);
 }
 
+void helper_fpscr_clrbit (uint32_t bit)
+{
+    int prev;
+
+    prev = (env->fpscr >> bit) & 1;
+    env->fpscr &= ~(1 << bit);
+    if (prev == 1) {
+        switch (bit) {
+        case FPSCR_RN1:
+        case FPSCR_RN:
+            fpscr_set_rounding_mode();
+            break;
+        default:
+            break;
+        }
+    }
+}
+
 void helper_fpscr_setbit (uint32_t bit)
 {
     int prev;