[4.5:r99324] Restrict base registers to low regs for Thumb-2

[Andrew Stubbs]

Related: lp:gcc-linaro/4.5,revno=99324

Restrict base registers to low regs for Thumb-2

Merged from SourceryG++

[Andrew Stubbs (ams-codesourcery)]

Upstream submission here:
 http://gcc.gnu.org/ml/gcc-patches/2010-05/msg02211.html

Patch not accepted as is. Needs adjustment and resubmission.

[Julian Brown (julian-codesourcery)]

There was also a followup patch a little later which was mostly-approved (apart from some trivial target-independent bits):

http://gcc.gnu.org/ml/gcc-patches/2010-06/msg01080.html

although it looks like CLASS_LIKELY_SPILLED_P has been hookized in the meantime, so the patch still needs adjusting now.

[Andrew Stubbs (ams-codesourcery)]

I've now rewritten and reposted this patch. The target independent parts seems to be superfluous now (perhaps obsoleted when CLASS_LIKELY_SPILLED_P was hookized?)

http://gcc.gnu.org/ml/gcc-patches/2011-02/msg00880.html

Awaiting upstream review ....

[Andrew Stubbs (ams-codesourcery)]

I'm not expected upstream review any time soon, so I've committed this to lp:gcc-linaro/4.6.

Related: lp:gcc-linaro/4.6,revno=106720

[Andrew Stubbs (ams-codesourcery)]

Now approved and committed upstream:

http://gcc.gnu.org/ml/gcc-patches/2011-03/msg02086.html