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https://github.com/fluencelabs/wasmer
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90 lines
2.5 KiB
Plaintext
Vendored
90 lines
2.5 KiB
Plaintext
Vendored
(module
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;; Recursive factorial
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(func (export "fac-rec") (param i64) (result i64)
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(if (result i64) (i64.eq (get_local 0) (i64.const 0))
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(then (i64.const 1))
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(else
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(i64.mul (get_local 0) (call 0 (i64.sub (get_local 0) (i64.const 1))))
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)
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)
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)
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;; Recursive factorial named
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(func $fac-rec-named (export "fac-rec-named") (param $n i64) (result i64)
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(if (result i64) (i64.eq (get_local $n) (i64.const 0))
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(then (i64.const 1))
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(else
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(i64.mul
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(get_local $n)
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(call $fac-rec-named (i64.sub (get_local $n) (i64.const 1)))
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)
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)
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)
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)
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;; Iterative factorial
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(func (export "fac-iter") (param i64) (result i64)
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(local i64 i64)
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(set_local 1 (get_local 0))
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(set_local 2 (i64.const 1))
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(block
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(loop
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(if
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(i64.eq (get_local 1) (i64.const 0))
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(then (br 2))
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(else
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(set_local 2 (i64.mul (get_local 1) (get_local 2)))
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(set_local 1 (i64.sub (get_local 1) (i64.const 1)))
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)
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)
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(br 0)
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)
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)
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(get_local 2)
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)
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;; Iterative factorial named
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(func (export "fac-iter-named") (param $n i64) (result i64)
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(local $i i64)
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(local $res i64)
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(set_local $i (get_local $n))
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(set_local $res (i64.const 1))
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(block $done
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(loop $loop
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(if
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(i64.eq (get_local $i) (i64.const 0))
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(then (br $done))
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(else
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(set_local $res (i64.mul (get_local $i) (get_local $res)))
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(set_local $i (i64.sub (get_local $i) (i64.const 1)))
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)
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)
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(br $loop)
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)
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)
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(get_local $res)
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)
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;; Optimized factorial.
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(func (export "fac-opt") (param i64) (result i64)
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(local i64)
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(set_local 1 (i64.const 1))
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(block
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(br_if 0 (i64.lt_s (get_local 0) (i64.const 2)))
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(loop
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(set_local 1 (i64.mul (get_local 1) (get_local 0)))
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(set_local 0 (i64.add (get_local 0) (i64.const -1)))
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(br_if 0 (i64.gt_s (get_local 0) (i64.const 1)))
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)
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)
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(get_local 1)
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)
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)
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(assert_return (invoke "fac-rec" (i64.const 25)) (i64.const 7034535277573963776))
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(assert_return (invoke "fac-iter" (i64.const 25)) (i64.const 7034535277573963776))
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(assert_return (invoke "fac-rec-named" (i64.const 25)) (i64.const 7034535277573963776))
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(assert_return (invoke "fac-iter-named" (i64.const 25)) (i64.const 7034535277573963776))
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(assert_return (invoke "fac-opt" (i64.const 25)) (i64.const 7034535277573963776))
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(assert_exhaustion (invoke "fac-rec" (i64.const 1073741824)) "call stack exhausted")
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