From: Richard Henderson <rth@twiddle.net>
To: linuxppc-dev@lists.ozlabs.org
Subject: Accumulating PPC_FEATURE_ARCH bits
Date: Mon, 18 Feb 2013 09:06:08 -0800 [thread overview]
Message-ID: <51225F80.3030706@twiddle.net> (raw)
If one wants to test the PPC_FEATURE_ARCH_ISA_2_0[56] bits, one has to
be careful that if 2_06 is set, 2_05 won't be. This seems illogical to
me: given that 2.06 includes all of the 2.05 instructions, it would make
most sense if both bits were set in the hwcap.
Now, obviously I have to code around existing practice, but going
forward this isn't tennable. When a Power 2.07 ISA is released, I'd
rather not have existing programs degrade because suddenly the 2_06 bit
is no longer set.
Thanks,
r~
reply other threads:[~2013-02-18 17:06 UTC|newest]
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