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[Bug 1001959] ARM call-graph profiling
- From: bugzilla-daemon at bugs dot ecos dot sourceware dot org
- To: unassigned at bugs dot ecos dot sourceware dot org
- Date: Sat, 15 Mar 2014 20:15:42 +0000
- Subject: [Bug 1001959] ARM call-graph profiling
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- Auto-submitted: auto-generated
- References: <bug-1001959-777 at http dot bugs dot ecos dot sourceware dot org/>
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http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001959
--- Comment #2 from John Dallaway <john@dallaway.org.uk> ---
(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.
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