[pypy-commit] pypy ppc-updated-backend: Avoid index error for operations with no arguments

[ISF]

Author: Ivan Sichmann Freitas <ivansichfreitas at gmail.com>
Branch: ppc-updated-backend
Changeset: r73091:39a0b812af40
Date: 2014-08-27 17:15 -0300
http://bitbucket.org/pypy/pypy/changeset/39a0b812af40/

Log:	Avoid index error for operations with no arguments

diff --git a/rpython/jit/backend/ppc/regalloc.py b/rpython/jit/backend/ppc/regalloc.py
--- a/rpython/jit/backend/ppc/regalloc.py
+++ b/rpython/jit/backend/ppc/regalloc.py
@@ -21,6 +21,7 @@
 from rpython.jit.backend.ppc import locations
 from rpython.rtyper.lltypesystem import rffi, lltype, rstr, llmemory
 from rpython.rtyper.lltypesystem.lloperation import llop
+from rpython.rtyper.annlowlevel import cast_instance_to_gcref
 from rpython.jit.backend.llsupport import symbolic
 from rpython.jit.backend.llsupport.descr import ArrayDescr
 import rpython.jit.backend.ppc.register as r
@@ -494,8 +495,14 @@
         return [loc1, res]
 
     def prepare_finish(self, op):
-        loc = self.loc(op.getarg(0))
-        self.possibly_free_var(op.getarg(0))
+        if op.numargs() > 0:
+            loc = self.loc(op.getarg(0))
+            self.possibly_free_var(op.getarg(0))
+        else:
+            descr = op.getdescr()
+            fail_descr = cast_instance_to_gcref(descr)
+            fail_descr = rffi.cast(lltype.Signed, fail_descr)
+            loc = imm(fail_descr)
         return [loc]
 
     def prepare_call_malloc_gc(self, op):