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From: Matthias S. <zz...@ge...> - 2015-07-14 21:59:41
|
Am 10.07.2015 um 12:23 schrieb Julian Seward: > > Yes, sounds like it's worth committing. One comment: > > For the places where we do a zero-extend load into a 32 bit > register, followed by a narrower-than-32-bit comparison on the loaded > data, eg > >> +" movzwl (%ecx,%edx,2),%edx\n" >> +" cmp $0xaaaa,%dx\n" > > and > >> +" movzbl (%ecx,%edx,1),%edx\n" /* dl = VA bits for 32bit */ >> +" cmp $0xaa,%dl\n" /* compara to VA_BITS8_DEFINED? */ > > .. is there any performance gain or change compared to doing a 32 bit > comparison at the full width? > > cmpl $0xaaaa, %edx > cmpl $0xaa, %edx > > I would prefer to use 32 bits throughout, since it avoids any possible > microarchitectural bad effects -- due to sub-register reads, or length- > changing prefixes (0x66) -- that might happen. I did a first try today. Observations: cmpl instruction has no 0x66 prefix, but is encoded with 32bit immediate value. But I guess instruction length is not really relevant for performance. 0x28008870 <+48>: 66 81 fa 55 55 cmp $0x5555,%dx vs. 0x28008870 <+48>: 81 fa 55 55 00 00 cmp $0x5555,%edx I think it does not make sense to replace the cmp in the parts of LOADV16le and LOADV8 that care about 16bit or 8bit chunks. Does it make sense to align jump targets to 16 bytes? First performance measurements show no clear indication faster/slower here. About the perf test suite: It measures cpu time used in userspace. Why is it not deterministic? Regards Matthias |