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Re: [PATCH] Fix PR 13987, compile time slow down on powerpc-apple-darwin
I think the comment is OK. I don't think we need to override this.
We are looking for an integer which is fast even when targetting a
64-bit machine. I think your suggestion of HOST_FAST_INT is
reasonable. When targetting a 32-bit machine, HOST_FAST_INT and
HOST_WIDE_INT would normally be the same. When targetting a 64-bit
machine, HOST_WIDE_INT must be 64 bits, but HOST_FAST_INT might be 32
So (unsigned) long will always work, you think? Or does it need
a platform-specific override? I can only think of 8- or 16-bit
host machines wanting that; and I don't really care about the speed
of compiling _on_ such a machine ;-)
There are popular targets which require a 64-bit HOST_WIDE_INT--
powerpc, mips, x86_64--so I think HOST_FAST_INT is a reasonable idea
to use in bitmap operations.
That's what I did to speedup bitmap.[ch], but I hardcoded it to
unsigned long. Will convert to HOST_FAST_INT and sbitmap too,
and whatever else I find (some register set stuff at least, I think).