[PATCH] ARM: Always generate the IT instruction when compilingfor Thumb-2

Catalin Marinas catalin.marinas at arm.com
Thu Jan 28 08:05:04 EST 2010


On Wed, 2010-01-27 at 22:02 +0000, Russell King - ARM Linux wrote:
> On Tue, Jan 26, 2010 at 10:14:24AM +0000, Catalin Marinas wrote:
> > Current behaviour is to generate the IT instruction only for Thumb-2
> > code. However, the kernel helpers in entry-armv.S are compiled to ARM in
> > a unified syntax file (if THUMB2_KERNEL). Recent compilers warn about
> > missing IT instruction in unified assembly syntax files. The patch
> > changes the "-mimplicit-it" gas option to "always".
> 
> Any downsides to this change?  Any assemblers not accepting "always"
> instead of "thumb" ?

When the -mimplicit-it was merged into mainline gas, it supported all of
thumb, arm, always and never. We still have the old -mauto-it but that's
I think only valid for the CodeSourcery toolchains.

-- 
Catalin




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