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References: <bug-41089-1649@http.gcc.gnu.org/bugzilla/>
Subject: [Bug tree-optimization/41089] [4.5 Regression] r147980 (New SRA) breaks stdargs
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From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
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------- Comment #25 from rguenth at gcc dot gnu dot org  2009-09-10 22:12 -------
The first store to ap.offset is dead.

<bb 5>:
  # iftmp.0_1 = PHI <iftmp.0_7(3), iftmp.0_8(4)>
  D.2024_9 = D.2018_5 + iftmp.0_1;
  D.2017_10 = D.2017_4 + 8;
  D.2025_11 = (int) D.2017_10;
  ap.__offset = D.2025_11;
  D.2026_12 = *D.2024_9;
  x.1_13 = (long int) D.2026_12;
  x = x.1_13;
  D.2028_16 = (long int) D.2025_11;
  D.2029_17 = (int *) D.2015_2;
  D.2030_18 = (long unsigned int) D.2028_16;
  D.2031_19 = D.2029_17 + D.2030_18;
  D.2028_20 = D.2028_16 + 8;
  D.2032_21 = (int) D.2028_20;
  ap.__offset = D.2032_21;

So if tree-stdarg relies on it it's bogus.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41089