On Tue, Nov 10, 2020 at 06:59:30PM +0100, Stefan Kanthak via Gcc-patches wrote:
> The implementation of the __ashlDI3(), __ashrDI3() and __lshrDI3() functions
> is rather bad, it yields bad machine code at least on i386 and AMD64.
> Since GCC knows how to shift integers twice the register size these functions
> can be written as one-liners.
>
> The implementation of the __bswapsi2() function uses SIGNED instead of
> unsigned mask values; cf. __bswapdi2()
The 0xff000000 constant is unsigned, the others are signed, but that doesn't
really matter as the high bits are masked off.
Jakub
