[llvm-bugs] [Bug 48778] New: wrong code with "-inline -sroa -instcombine -globalopt -simplifycfg"

via llvm-bugs llvm-bugs at lists.llvm.org
Sun Jan 17 03:46:48 PST 2021


            Bug ID: 48778
           Summary: wrong code with "-inline -sroa -instcombine -globalopt
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: suochenyao at 163.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 24389
  --> https://bugs.llvm.org/attachment.cgi?id=24389&action=edit
IR that is passed to opt

OS and Platform:
CentOS Linux release 7.8.2003 (Core), x86_64 GNU/Linux
static int a = -1L;
int b;
int main() { b = a > 0 && (-2147483647 - 1) / a ? 0 : a; }
clang version:
$ clang -v
clang version 12.0.0 (/home/suocy/src/llvm-dev/llvm-project/llvm/tools/clang
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/suocy/bin/llvm-dev/bin
Found candidate GCC installation:
Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/4.8.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/4.8.5
Selected GCC installation:
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
Command Lines:
$ clang -O3 -mllvm -disable-llvm-optzns -c -emit-llvm a.c -o a.bc
$ opt -inline -sroa -instcombine -globalopt -simplifycfg a.bc -o a.opt.bc
$ clang a.opt.bc -o a1.o
$ clang a.bc -o a2.o
$ ./a1.o
Floating point exception
$ ./a2.o

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