compiler-builtins-zynq/src/riscv32.rs

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intrinsics! {
// Implementation from gcc
// https://raw.githubusercontent.com/gcc-mirror/gcc/master/libgcc/config/epiphany/mulsi3.c
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pub extern "C" fn __mulsi3(a: u32, b: u32) -> u32 {
let (mut a, mut b) = (a, b);
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let mut r = 0;
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while a > 0 {
if a & 1 > 0 {
r += b;
}
a >>= 1;
b <<= 1;
}
r
}
}