Eric Botcazou <[email protected]> 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.
>
> These functions are precisely meant to be used when GCC cannot do that.
On which processor(s) is GCC unable to generate code for DWtype shifts?
JFTR: if GCC were not able to generate code for DWtype addition and subtraction
it would also need __[u]addDI3() and __[u]subDI3() functions ... which
are but missing from libgcc.a
Stefan Kanthak
