On 27 February 2012 16:27, Ian Campbell <ian.campb...@citrix.com> wrote: > R12 is not accessible from the 16 bit "T1" Thumb encoding of mov > immediate (which can only target r0..r7). > > Since we support only ARMv7+ there are "T2" and "T3" encodings available > which do allow direct mov of an immediate into R12, but are 32 bit Thumb > instructions. > > Should we use r7 instead to maximise instruction density for Thumb code?
r7 is (used by gcc as) the Thumb frame pointer; I don't know if this makes it worth avoiding in this context. -- PMM _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
