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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103999] New: Vectorizer failed to reduce sum with conversion.
Date: Thu, 13 Jan 2022 01:25:17 +0000	[thread overview]
Message-ID: <bug-103999-4@http.gcc.gnu.org/bugzilla/> (raw)

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103999

            Bug ID: 103999
           Summary: Vectorizer failed to reduce sum with conversion.
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: crazylht at gmail dot com
  Target Milestone: ---

Vectorizer failed for sum_reduce_cd, but ok for sum_reduce/sum_reduce_cint

float sum_reduce_cd (int n, float* array)
{
    float ans = 0.0f, x;
    for (int i = 0; i != n; i++)
      {
          x = array[i];
          ans += x + 1.0;
      }
    return ans;
}

float sum_reduce (int n, float* array)
{
    float ans = 0.0f, x;
    for (int i = 0; i != n; i++)
      {
          x = array[i];
          ans += x + 1.0f;
      }
    return ans;
}

float sum_reduce_cint (int n, float* array)
{
    int ans = 0;
    float x;
    for (int i = 0; i != n; i++)
      {
          x = array[i];
          ans += (int)(x + 1.0);
      }
    return ans;
}

https://godbolt.org/z/q3McP6d15

             reply	other threads:[~2022-01-13  1:25 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-13  1:25 crazylht at gmail dot com [this message]
2022-01-13  1:29 ` [Bug tree-optimization/103999] " crazylht at gmail dot com
2022-01-13  8:35 ` rguenth at gcc dot gnu.org

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