df4365921d
Added JIT tutorial ports (Sebastien Binet) Updated documentation git-svn-id: http://llvm-py.googlecode.com/svn/trunk@23 8d1e9007-1d4e-0410-b67e-1979fd6579aa
50 lines
1.2 KiB
Python
50 lines
1.2 KiB
Python
#!/usr/bin/env python
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from llvm.core import *
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# create a module
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module = Module.new ("tut2")
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# create a function type taking 2 integers, return a 32-bit integer
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ty_int = Type.int (32)
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func_type = Type.function (ty_int, (ty_int, ty_int))
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# create a function of that type
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gcd = Function.new (module, func_type, "gcd")
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# name function args
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x = gcd.args[0]; x.name = "x"
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y = gcd.args[1]; y.name = "y"
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# implement the function
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# blocks...
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entry = gcd.append_basic_block ("entry")
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ret = gcd.append_basic_block ("return")
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cond_false = gcd.append_basic_block ("cond_false")
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cond_true = gcd.append_basic_block ("cond_true")
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cond_false_2 = gcd.append_basic_block ("cond_false_2")
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# create a llvm::IRBuilder
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bldr = Builder.new (entry)
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x_eq_y = bldr.icmp (IPRED_EQ, x, y, "tmp")
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bldr.cbranch (x_eq_y, ret, cond_false)
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bldr.position_at_end (ret)
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bldr.ret(x)
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bldr.position_at_end (cond_false)
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x_lt_y = bldr.icmp (IPRED_ULT, x, y, "tmp")
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bldr.cbranch (x_lt_y, cond_true, cond_false_2)
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bldr.position_at_end (cond_true)
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y_sub_x = bldr.sub (y, x, "tmp")
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recur_1 = bldr.call (gcd, (x, y_sub_x,), "tmp")
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bldr.ret (recur_1)
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bldr.position_at_end (cond_false_2)
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x_sub_y = bldr.sub (x, y, "x_sub_y")
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recur_2 = bldr.call (gcd, (x_sub_y, y,), "tmp")
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bldr.ret (recur_2)
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print module
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