On Monday 12 June 2006 15:19, Catalin Marinas wrote: > On Mon, 2006-06-12 at 14:16 +0100, Paul Brook wrote: > > > Martin pointed me to the AemEabiPort wiki page that suggests that the > > > function return is "tst lr, #1; moveq pc, lr; bx lr" and this would > > > work on ARMv4t as well. > > > > > > However, if the reason for this is to work on StrongARM (which doesn't > > > support Thumb, AFAIK) you could ban the Thumb use on ARMv4(t) and a > > > standard LDM or MOV PC, LR would return to Thumb code correctly on > > > ARMv5t. Debian would be built in ARM mode anyway and Thumb > > > interworking would only work correctly one ARMv5t (and later) cores. > > > > Are you sure? I was under the impression that "mov pc, lr" was only > > interworking safe on Armv7. > > You are right, but the "ldm" method is supported in ARMv5 and it could > be used.
Agreed. We can use the ldm sequence when it's available. I guess whether it's more efficient to force the operand to memory or to use the tst sequence may depends on the context. Paul -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
