cat example.watup | ./bin -
(define $name $body*)
Defines are exact "search and replace" without any evaluations. They are like macros without arguments.
(define $PI (f64.const 3.14159))
(define $TAU (f64.mul $PI (f64.const 2)))
(return (f64.sin (get_local $radians) $TAU))
;; Future versions may statically evaluate $TAU to a f64.const
(return (f64.sin (get_local $radians)
(f64.mul (f64.const 3.14159)
(f64.const 2))))(macro $name $args $body*)
Simple replacement
(macro i32.add_in_place ($x $y)
(set_local $x (i32.add (get_local $x)
(get_local $y))))
(local $a i32)
(local $b i32)
(i32.add_in_place $a $b)
(local $a i32)
(local $b i32)
(set_local $a (i32.add (get_local $a)
(get_local $b)))Instruction replacement
(macro i8.load_grey_pixel (#ptr)
(i32.div_u (i32.add (i32.load8_u offset=0 #ptr)
(i32.add (i32.load8_u offset=1 #ptr)
(i32.load8_u offset=2 #ptr)))
(i32.const 3)))
(param $input.ptr i32)
(i8.load_grey_pixel (get_local $input.ptr))
(param $input.ptr i32)
(i32.div_u (i32.add (i32.load8_u offset=0 (get_local $input.ptr))
(i32.add (i32.load8_u offset=1 (get_local $input.ptr))
(i32.load8_u offset=2 (get_local $input.ptr))))
(i32.const 3))(unroll $placeholder $data $body*)
Simple unroll
(unroll #idx (seq 0 3)
(local $x{#idx} i32))
(local $x0 i32)
(local $x1 i32)
(local $x2 i32)Nested unroll
(unroll #i (seq 0 16 4)
(unroll #j '($a $b $c)
(i32.load offset={#i} (get_local {#j})))
(i32.load offset=0 (get_local $a))
(i32.load offset=0 (get_local $b))
(i32.load offset=0 (get_local $c))
(i32.load offset=4 (get_local $a))
(i32.load offset=4 (get_local $b))
(i32.load offset=4 (get_local $c))
(i32.load offset=12 (get_local $a))
(i32.load offset=12 (get_local $b))
(i32.load offset=12 (get_local $c))Destructuring
(define #IV '(
(128 0x6a09e667f3bcc908)
(136 0xbb67ae8584caa73b)
(144 0x3c6ef372fe94f82b)
(152 0xa54ff53a5f1d36f1)
(160 0x510e527fade682d1)
(168 0x9b05688c2b3e6c1f)
(176 0x1f83d9abfb41bd6b)
(184 0x5be0cd19137e2179)))
(param $ptr i32)
(unroll (#offset #const) #IV
(i64.store offset={#offset} (get_local $ptr) (i64.const {#const})))
(param $ptr i32)
(i64.store offset=128 (get_local $ptr) (i64.const 0x6a09e667f3bcc908))
(i64.store offset=136 (get_local $ptr) (i64.const 0xbb67ae8584caa73b))
(i64.store offset=144 (get_local $ptr) (i64.const 0x3c6ef372fe94f82b))
(i64.store offset=152 (get_local $ptr) (i64.const 0xa54ff53a5f1d36f1))
(i64.store offset=160 (get_local $ptr) (i64.const 0x510e527fade682d1))
(i64.store offset=168 (get_local $ptr) (i64.const 0x9b05688c2b3e6c1f))
(i64.store offset=176 (get_local $ptr) (i64.const 0x1f83d9abfb41bd6b))
(i64.store offset=184 (get_local $ptr) (i64.const 0x5be0cd19137e2179))
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