[llvm-bugs] [Bug 30286] New: [AVX-512] KNL bug at -O0

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30286

            Bug ID: 30286
           Summary: [AVX-512] KNL bug at -O0
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: babokin at gmail.com
                CC: guy.blank at intel.com, llvm-bugs at lists.llvm.org,
                    Vsevolod.Livinskij at frtk.ru
    Classification: Unclassified

> cat pr.cpp
#include <iostream>

struct S {
  unsigned long ul : 25 ;
} s;

int main () {
    s.ul = 27833667UL;
    bool b = ((bool)  !(((bool) s.ul ) && true)) && true;
    std::cout << (b ? "FAIL":"PASS") << "\n";
    return 0;
}

> clang++ -O0 -o no_opt pr.cpp
> ./no_opt
PASS
> clang++ -O0 -march=knl -o knl_no_opt pr.cpp
>sde -knl -- ./knl_no_opt
FAIL

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