[llvm-bugs] [Bug 51505] New: [execute]binary compile with -O0 run diff to gcc -O0 on aarch64

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51505

            Bug ID: 51505
           Summary: [execute]binary compile with -O0 run diff to gcc -O0
                    on aarch64
           Product: clang
           Version: 12.0
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: yansendao at huawei.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Created attachment 25147
  --> https://bugs.llvm.org/attachment.cgi?id=25147&action=edit
test-creduce.c

yansendao at jvmtest-129:boole-issue2603$ gcc test-creduce.c -Wall && ./a.out 
3
yansendao at jvmtest-129:boole-issue2603$ ~/software/llvm12/bin/clang
test-creduce.c -Wall && ./a.out    
test-creduce.c:7:10: warning: result of comparison of constant -1 with
expression of type 'unsigned int' is always true
[-Wtautological-constant-out-of-range-compare]
  if (~a > -1L)
      ~~ ^ ~~~
1 warning generated.
0
yansendao at jvmtest-129:boole-issue2603$ ~/software/llvm12/bin/clang -v
clang version 12.0.1
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/yansendao/software/llvm12/bin
Found candidate GCC installation: /usr/lib/gcc/aarch64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/aarch64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/aarch64-linux-gnu/8
Found candidate GCC installation: /usr/lib64/gcc/aarch64-linux-gnu/7
Found candidate GCC installation: /usr/lib64/gcc/aarch64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib64/gcc/aarch64-linux-gnu/8
Selected GCC installation: /usr/lib64/gcc/aarch64-linux-gnu/7.5.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
yansendao at jvmtest-129:boole-issue2603$ cat test-creduce.c
int printf(const char *, ...);
unsigned a;
long b;
short c, d;
long *e = &b;
short f() {
  if (~a > -1L)
    return 3;
  return d;
}
int main() {
  c = f();
  *e = c;
  printf("%d\n", (int)b);
  return 0;
}

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20210817/ae511239/attachment.html>