add regression test for fsqrt hang

tests/regress/x86_fldt_fsqrt.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+from unicorn import *
+from unicorn.x86_const import *
+from struct import pack
+
+import regress
+
+CODE_ADDR = 0x1000000
+CODE = (
+    '\xb8\x00\x00\x00\x02' # mov eax, 0x2000000
+    '\xdb\x28'             # fldt [eax]
+    '\xd9\xfa'             # fsqrt
+)
+
+DATA_ADDR = 0x2000000
+DATA = '\0\0\0\0\0\0\0\0\0\1'
+
+class FldtFsqrt(regress.RegressTest):
+    def test_fldt_fsqrt(self):
+        uc = Uc(UC_ARCH_X86, UC_MODE_32)
+
+        uc.mem_map(CODE_ADDR, 0x1000)
+        uc.mem_write(CODE_ADDR, CODE)
+
+        uc.mem_map(DATA_ADDR, 0x1000)
+        uc.mem_write(DATA_ADDR, DATA)
+
+        uc.emu_start(CODE_ADDR, CODE_ADDR + len(CODE), 10000, 10)
+
+if __name__ == '__main__':
+    regress.main()