Closed
Description
It seems we have wrong polyfills of rotr / rotl for small integers like u16 / u8. Here how it compile now:
function rotL16(a: u16, b: u16): u16 {
return rotl<u16>(a, b);
}current result:
(func $rotL16 (param $0 i32) (param $1 i32) (result i32)
local.get $0
i32.const 65535
i32.and
local.get $1
i32.rotl
i32.const 65535
i32.and
)what I expected:
(func $rotL16 (param $0 i32) (param $1 i32) (result i32)
local.get $0
local.get $1
i32.const 15
i32.and
i32.shl
local.get $0
i32.const 0
local.get $1
i32.sub
i32.const 15
i32.and
i32.shr_u
i32.or
i32.const 65535
i32.and
)which equivalent to:
function rotl(a: u16, b: u16): u16 {
return (a << (b & 15)) | (a >>> (-b & 15));
// rotr<16>(x, y):
// return (x >>> (y & 15)) | (x << (-y & 15));
}