bf115fd457
On Mon, Mar 31, 2025 at 03:34:07PM +0200, Martin Jambor wrote: > This patch just introduces a form of dumping of widest ints that only > have zeros in the lowest 128 bits so that instead of printing > thousands of f's the output looks like: > > Bits: value = 0xffff, mask = all ones folled by 0xffffffffffffffffffffffffffff0000 > > and then makes sure we use the function not only to print bits but > also to print masks where values like these can also occur. Shouldn't that be followed by instead? And the widest_int checks seems to be quite expensive (especially for large widest_ints), I think for the first one we can just == -1 and for the second one wi::arshift (value, 128) == -1 and the zero extension by using wi::zext. Anyway, I wonder if it wouldn't be better to use something shorter, the variant patch uses 0xf..f prefix before the 128-bit hexadecimal number (maybe we could also special case the even more common bits 64+ are all ones case). Or it could be 0xf*f prefix. Or printing such numbers as -0x prefixed negative, though that is not a good idea for masks. This version doesn't print e.g. 0xf..fffffffffffffffffffffffffffff0000 but just 0xf..f0000 (of course, for say mask of 0xf..f0000000000000000000000000000ffff it prints it like that, doesn't try to shorten the 0 digits. But if the most significant bits aren't set, it will be just 0xffff. 2025-04-15 Jakub Jelinek <jakub@redhat.com> * ipa-cp.cc (ipcp_print_widest_int): Print values with all ones in bits 128+ with "0xf..f" prefix instead of "all ones folled by ". Simplify wide_int check for -1 or all ones above least significant 128 bits. |
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