Failure to build librseq on ppc

Segher Boessenkool segher at kernel.crashing.org
Thu Jul 9 10:15:36 AEST 2020


On Wed, Jul 08, 2020 at 10:32:20AM -0400, Mathieu Desnoyers wrote:
> > As far as I can see, %U is mentioned in
> > https://gcc.gnu.org/onlinedocs/gcc/Machine-Constraints.html in the
> > powerpc subpart, at the "m" constraint.
> 
> Yep, I did notice it, but mistakenly thought it was only needed for "m<>" operand,
> not "m".

Historically, "m" meant what "m<>" does now (in inline asm).  Too many
people couldn't get it right ever (on other targets -- not that the
situation was great for PowerPC, heh), so in inline asm "m" now means
"no pre-modify or post-modify".


Segher


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