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Re: [PATCH] Fix PPC scan_prologue for code generated with -mno-update
On Friday 16 February 2007, Mark Kettenis wrote:
> Looks reasonable to me. However there's one thing I don't understand.
> Presuming you're using DWARF2 debug info, why does improving the
> prologue scanner make such a big difference?
Good question.
Originally the problem popped up in an environment where the user was
using stabs debugging format with a pretty ancient compiler.
I distilled the problem down to a simple test case and compiled it
without debugging info, after I figured out the problem was an issue
with the prologue scanner.
Perhaps this has uncovered another bug related to how the DWARF info
is used. It's certainly worth investigating.
However I believe the patch is still beneficial, for the cases where
the debug format is something other than DWARF or there is no debug
info.
-Fred