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From: "jmuizelaar at mozilla dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/99966] New: Bounds check not eliminated by
 assert
Date: Thu, 08 Apr 2021 01:23:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99966

            Bug ID: 99966
           Summary: Bounds check not eliminated by assert
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jmuizelaar at mozilla dot com
  Target Milestone: ---

#include <cassert>
#include <cstdint>
#include <cstddef>
#include <vector>

uint64_t f(std::vector<uint64_t>& data, size_t start, size_t end){
    assert(start < end && start < data.size() && end <=3D data.size());


    uint64_t total =3D 0;
    for (size_t i =3D start; i < end; i++) {
        total +=3D data.at(i);
    }
    return total;
}

https://godbolt.org/z/Ksecrec11

Clang is able to eliminate the the check when using -mllvm
-enable-constraint-elimination
https://godbolt.org/z/K67b8PTM9=