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[Patch] Reduce regex _M_dfs frame size

From: Tim Shen <timshen at google dot com>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>, "libstdc++" <libstdc++ at gcc dot gnu dot org>
Date: Sat, 20 Aug 2016 03:28:24 -0700
Subject: [Patch] Reduce regex _M_dfs frame size
Authentication-results: sourceware.org; auth=none

I merely split _M_dfs() into small functions to see how it goes. It
turns out to save half of the stack consumption in -O0 without
observable performance impact.

If we want, we can use __attribute__((always_inline)) and
__attribute__((noinline)) to make those handler functions back and
forth for reasons. We know that we are going to do better than the
inliner on complicated recursive functions, right? :)

Thanks!


-- 
Regards,
Tim Shen

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Follow-Ups:
- Re: [Patch] Reduce regex _M_dfs frame size
  - From: Jonathan Wakely

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