Patch for OpenBSD, x86_64 support (Laurence Tratt)

Added JIT tutorial ports (Sebastien Binet)
Updated documentation

git-svn-id: http://llvm-py.googlecode.com/svn/trunk@23 8d1e9007-1d4e-0410-b67e-1979fd6579aa

test/JITTutorial2.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+
+from llvm.core import *
+
+# create a module
+module = Module.new ("tut2")
+
+# create a function type taking 2 integers, return a 32-bit integer
+ty_int    = Type.int (32)
+func_type = Type.function (ty_int, (ty_int, ty_int))
+
+# create a function of that type
+gcd = Function.new (module, func_type, "gcd")
+
+# name function args
+x = gcd.args[0]; x.name = "x"
+y = gcd.args[1]; y.name = "y"
+
+# implement the function
+
+# blocks...
+entry = gcd.append_basic_block ("entry")
+ret   = gcd.append_basic_block ("return")
+cond_false   = gcd.append_basic_block ("cond_false")
+cond_true    = gcd.append_basic_block ("cond_true")
+cond_false_2 = gcd.append_basic_block ("cond_false_2")
+
+# create a llvm::IRBuilder
+bldr = Builder.new (entry)
+x_eq_y = bldr.icmp (IPRED_EQ, x, y, "tmp")
+bldr.cbranch (x_eq_y, ret, cond_false)
+
+bldr.position_at_end (ret)
+bldr.ret(x)
+
+bldr.position_at_end (cond_false)
+x_lt_y = bldr.icmp (IPRED_ULT, x, y, "tmp")
+bldr.cbranch (x_lt_y, cond_true, cond_false_2)
+
+bldr.position_at_end (cond_true)
+y_sub_x = bldr.sub (y, x, "tmp")
+recur_1 = bldr.call (gcd, (x, y_sub_x,), "tmp")
+bldr.ret (recur_1)
+
+bldr.position_at_end (cond_false_2)
+x_sub_y = bldr.sub (x, y, "x_sub_y")
+recur_2 = bldr.call (gcd, (x_sub_y, y,), "tmp")
+bldr.ret (recur_2)
+
+print module