Fix fxtract

src/rust/cpu2/fpu.rs

@@ -769,7 +769,7 @@ pub unsafe fn fpu_fxtract() {
         *fpu_stack_ptr as i32,
         f.exponent as f64 - F64_EXPONENT_BIAS as f64,
     );
-    f.exponent = 0x7FF;
+    f.exponent = 0x3FF;
     fpu_push(f.to_f64());
 }
 #[no_mangle]

tests/nasm/fxtract.asm

@@ -0,0 +1,12 @@
+global _start
+
+section .data
+	align 16
+
+%include "header.inc"
+
+    push 12345
+    fild dword [esp]
+    fxtract
+
+%include "footer.inc"