Messages in this thread | | | Date | Fri, 8 Mar 2019 09:54:07 +0000 | From | Russell King - ARM Linux admin <> | Subject | Re: [PATCH 2/2] ARM: futex: make futex_detect_cmpxchg more reliable |
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On Thu, Mar 07, 2019 at 04:04:23PM -0800, Nick Desaulniers wrote: > On Thu, Mar 7, 2019 at 3:49 PM Russell King - ARM Linux admin > <linux@armlinux.org.uk> wrote: > > > > On Thu, Mar 07, 2019 at 11:39:08AM -0800, Nick Desaulniers wrote: > > > Underspecification of constraints to extended inline assembly is a > > > common issue exposed by other compilers (and possibly but in-effect > > > infrequently compiler upgrades). > > > > I don't see what is "underspecified" in the original constraints. > > Please explain. > > From the link: > > The problem is that in the T(streq) insn, %3 and %4 MUST be different registers, > but nothing in the asm() constrains them to be different.
Thanks, but that is not what I'm asking. See my reply to Ard.
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