[llvm-bugs] [Bug 43331] New: [ARM64:NEON] parentheses required for intrinsics (breaks designated initializers)

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Mon Sep 16 10:50:25 PDT 2019


            Bug ID: 43331
           Summary: [ARM64:NEON] parentheses required for intrinsics
                    (breaks designated initializers)
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ndesaulniers at google.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, kristof.beyls at arm.com,
                    llvm-bugs at lists.llvm.org, oliver.stannard at arm.com,
                    richard-llvm at metafoo.co.uk
            Blocks: 4068

See: https://godbolt.org/z/_DPvSg

Since the intrinsics are implemented as macros (IIRC, gcc implements these as
static inline functions), passing designated initializers to these intrinsics
requires wrapping them in another level of parentheses.  This adds a slight
headache to writing more compiler portable use of ARM NEON code.

Link: https://github.com/ClangBuiltLinux/linux/issues/641

Referenced Bugs:

[Bug 4068] [Meta] Compiling the Linux kernel with clang
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