[AArch64] NEON intrinsic compilation error occurs when using -fno-lax-vector-conversions

[yyctw]

This appears to be the same issue as the previous one #42686.

I discovered that certain NEON intrinsics failed to compile with the -fno-lax-vector-conversions flag, a problem that did not occur in GCC.

• Reproduce error: https://godbolt.org/z/Mhxqj9151
• Compare with GCC: https://godbolt.org/z/qc31v3no8

The NEON intrinsics that have this issue are listed below:

• vdupb_lane_p8, vdupb_laneq_p8, vdupbh_lane_p16, vduph_laneq_p16
• vset_lane_p8, vset_lane_p16, vset_lane_p64, vsetq_lane_p8, vsetq_lane_p16, vsetq_lane_p64
• vget_lane_p8, vget_lane_p16, vget_lane_p64, vgetq_lane_p8, vgetq_lane_p16, vgetq_lane_p64
• vcopy_lane_p8, vcopy_lane_p16, vcopy_lane_p64, vcopyq_lane_p8, vcopyq_lane_p16, vcopyq_lane_p64,
• vcopy_laneq_p8, vcopy_laneq_p16, vcopy_laneq_p64, vcopyq_laneq_p8, vcopyq_laneq_p16, vcopyq_laneq_p64

Thank you for your reading.

[llvmbot]

@llvm/issue-subscribers-backend-aarch64

Author: Yi-Yen Chung (yyctw)

This appears to be the same issue as the previous one https://github.com//issues/42686.

I discovered that certain NEON intrinsics failed to compile with the -fno-lax-vector-conversions flag, a problem that did not occur in GCC.

• Reproduce error: https://godbolt.org/z/Mhxqj9151
• Compare with GCC: https://godbolt.org/z/qc31v3no8

The NEON intrinsics that have this issue are listed below:

• vdupb_lane_p8, vdupb_laneq_p8, vdupbh_lane_p16, vduph_laneq_p16
• vset_lane_p8, vset_lane_p16, vset_lane_p64, vsetq_lane_p8, vsetq_lane_p16, vsetq_lane_p64
• vget_lane_p8, vget_lane_p16, vget_lane_p64, vgetq_lane_p8, vgetq_lane_p16, vgetq_lane_p64
• vcopy_lane_p8, vcopy_lane_p16, vcopy_lane_p64, vcopyq_lane_p8, vcopyq_lane_p16, vcopyq_lane_p64,
• vcopy_laneq_p8, vcopy_laneq_p16, vcopy_laneq_p64, vcopyq_laneq_p8, vcopyq_laneq_p16, vcopyq_laneq_p64

Thank you for your reading.

[mr-c]

I can confirm that this error is still reproducible with clang 16.0.0 - 20.1.0 and current (21.0.0git 2b16af8df2ee83ccb3b4d4a7aa48d13e7608a1cf) trunk using the provided Compiler Explorer link.

[efriedma-quic]

CC @Lukacma @momchil-velikov

[Lukacma]

Thanks @efriedma-quic for tagging us. We are going to work on the fix for this.