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[Bug 1001959] ARM call-graph profiling
- From: bugzilla-daemon at bugs dot ecos dot sourceware dot org
- To: ecos-patches at ecos dot sourceware dot org
- Date: Sat, 15 Mar 2014 22:12:06 +0000
- Subject: [Bug 1001959] ARM call-graph profiling
- Authentication-results: sourceware.org; auth=none
- Auto-submitted: auto-generated
- References: <bug-1001959-104 at http dot bugs dot ecos dot sourceware dot org/>
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http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001959
Ilija Kocho [ÐÐÐÑÐ ÐÐÑÐ] <ilijak@siva.com.mk> changed:
What |Removed |Added
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CC| |ilijak@siva.com.mk
--- Comment #3 from Ilija Kocho [ÐÐÐÑÐ ÐÐÑÐ] <ilijak@siva.com.mk> ---
(In reply to comment #2)
> (In reply to comment #1)
>
> > Just for my education (should have asked in bug 1001954 a week ago): When
> > using hardware FP, do we need to also put FPU registers?
>
> Ilija, by inspection, we know that the mcount functions do not use any FP
> registers. These functions call __profile_mcount() which is self-contained
> and does not perform any floating point calculations. So there is no
> possibility that function arguments passed in FP registers will be modified
> within the call to mcount() or __gnu_mcount_nc() and therefore no need for
> the mcount functions to save/restore FP registers.
Many thanks John.
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