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Subject: [Bug tree-optimization/54717] [4.8 Regression] Runtime regression: polyhedron test "rnflow" degraded
Date: Wed, 26 Sep 2012 20:07:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54717

--- Comment #5 from Sergey Ostanevich <sergos.gnu at gmail dot com> 2012-09-26 20:07:26 UTC ---
for 093t.pre I see the following missing in cptrf2 function, first is good,
second is degraded:

***************
*** 8947,8966 ****
    goto <bb 35>;

    <bb 93>:
-   pretmp_325 = (integer(kind=8)) ival2_80;
-   pretmp_326 = pretmp_325 + -1;
-   pretmp_327 = *xxtrt_25(D)[pretmp_326];

    <bb 27>:
    # ival2_136 = PHI <ival2_62(93), ival2_144(97)>
    # ival2_140 = PHI <ival2_80(93), ival2_146(97)>
-   # prephitmp_328 = PHI <pretmp_327(93), prephitmp_290(97)>
    _137 = (integer(kind=8)) ival2_136;
    _138 = _137 + -1;
    _139 = *xxtrt_25(D)[_138];
    _141 = (integer(kind=8)) ival2_140;
    _142 = _141 + -1;
!   _143 = prephitmp_328;
    if (_139 < _143)
      goto <bb 28>;
    else
--- 8838,8853 ----
    goto <bb 35>;

    <bb 93>:

    <bb 27>:
    # ival2_136 = PHI <ival2_62(93), ival2_144(97)>
    # ival2_140 = PHI <ival2_80(93), ival2_146(97)>
    _137 = (integer(kind=8)) ival2_136;
    _138 = _137 + -1;
    _139 = *xxtrt_25(D)[_138];
    _141 = (integer(kind=8)) ival2_140;
    _142 = _141 + -1;
!   _143 = *xxtrt_25(D)[_142];
    if (_139 < _143)
      goto <bb 28>;
    else
***************

but more surprising to me is that first diff is in 020t.inline_param1

***************
*** 16790,16794 ****
    calls:
      dtrti2/26 function not considered for inlining
!       loop depth: 0 freq:1000 size: 9 time: 18 callee size:82 stack:28
      dtrsm/21 function not considered for inlining
        loop depth: 0 freq:1000 size:16 time: 25 callee size:324 stack: 4
--- 16790,16794 ----
    calls:
      dtrti2/26 function not considered for inlining
!       loop depth: 0 freq:1000 size: 9 time: 18 callee size:81 stack:28
      dtrsm/21 function not considered for inlining
        loop depth: 0 freq:1000 size:16 time: 25 callee size:324 stack: 4
***************