[llvm-bugs] [Bug 42556] New: Clang backend error when using vmax_f16 neon intrinsic

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42556

            Bug ID: 42556
           Summary: Clang backend error when using vmax_f16 neon intrinsic
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: pirama at google.com
                CC: kristof.beyls at arm.com, llvm-bugs at lists.llvm.org,
                    peter.smith at linaro.org, sjoerd.meijer at arm.com,
                    srhines at google.com, Ties.Stuij at arm.com

See the attached link: https://godbolt.org/z/vTp2yV

Source:
$ cat fp16.c
#include <arm_neon.h>

float16x4_t m(float16x4_t a, float16x4_t b) {
  return vmax_f16(a, b);
}

Fail: clang -c -O2 -target armv7-linux-eabi -march=armv8.2-a+fp16 -mfpu=neon
Pass: clang -c -O2 -target armv7-linux-eabi -march=armv8.2-a+fp16
-mfpu=neon-fp-armv8

The error message is below:
fatal error: error in backend: Do not know how to split the result of this
operator!

clang-9: error: clang frontend command failed with exit code 70 (use -v to see
invocation)

I think the frontend and backend are inconsistent when dealing with this
intrinsic.

Adding Sjoerd Meijer who has recent changes related to this for comments.

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