[llvm-bugs] [Bug 52516] New: [M68k] Code selection failed with string length greater than or equal to 4

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Nov 15 23:14:27 PST 2021


            Bug ID: 52516
           Summary: [M68k] Code selection failed with string length
                    greater than or equal to 4
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: M68k
          Assignee: unassignedbugs at nondot.org
          Reporter: t104360003 at ntut.org.tw
                CC: glaubitz at physik.fu-berlin.de,
                    llvm-bugs at lists.llvm.org, minyihh at uci.edu

Created attachment 25450
  --> https://bugs.llvm.org/attachment.cgi?id=25450&action=edit
Preprocessed source

This is the code that triggered this error:

void test(char *s)

int main()
  char s[] = "123";
  return 0;

This is the error message:
$ clang -ccc-gcc-name linux-gnu-gcc --target=m68k tmp.c -o tmp
fatal error: error in backend: Cannot select: t47: i32,ch =
load<(dereferenceable load (s8) from `i8* getelementptr inbounds ([4 x i8], [4
x i8]* @__const.main.s, i32 0, i32 0)` + 1), zext from i8> t4, t46, undef:i32
  t46: i32 = add nuw t34, Constant:i32<1>
    t34: i32 = M68kISD::WrapperPC TargetGlobalAddress:i32<[4 x i8]*
@__const.main.s> 0
      t33: i32 = TargetGlobalAddress<[4 x i8]* @__const.main.s> 0
    t36: i32 = Constant<1>
  t3: i32 = undef
In function: main
clang-14: error: clang frontend command failed with exit code 70 (use -v to see
clang version 14.0.0 (https://github.com/llvm/llvm-project.git
Target: m68k
Thread model: posix
InstalledDir: /home/sheng/project/compiler/llvm_m68k/build/bin
clang-14: note: diagnostic msg:


Here's my environment:

$ clang-v
clang version 14.0.0 (https://github.com/llvm/llvm-project.git
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/sheng/project/compiler/llvm_m68k/build/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Selected multilib: .;@m64

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