[llvm-bugs] [Bug 46840] New: [AArch64] vqmovun* return types should be unsigned

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Jul 24 13:18:19 PDT 2020


https://bugs.llvm.org/show_bug.cgi?id=46840

            Bug ID: 46840
           Summary: [AArch64] vqmovun* return types should be unsigned
           Product: new-bugs
           Version: 11.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: clang at evan.coeusgroup.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

clang has signed return values for the vqmovun* functions, but they should be
unsigned.  See
https://developer.arm.com/architectures/instruction-sets/simd-isas/neon/intrinsics?search=vqmovun

Trivial test case:

  #include <arm_neon.h>

  uint16_t foo(int32_t v);

  uint16_t foo(int32_t v) {
    return vqmovuns_s32(v);
  }

On Compiler Explorer for convenience: https://godbolt.org/z/qYPP3j

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