[llvm-bugs] [Bug 38628] New: arm_neon.h doesn't support vmull_p64 on aarch32 armv8-a+crypto

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38628

            Bug ID: 38628
           Summary: arm_neon.h doesn't support vmull_p64 on aarch32
                    armv8-a+crypto
           Product: clang
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Headers
          Assignee: unassignedclangbugs at nondot.org
          Reporter: lennox at cs.columbia.edu
                CC: llvm-bugs at lists.llvm.org

According to the ARM C Language Extensions (version 2.1, section 12.3.13,
Crypto Intrinsics):

poly128_t vmull_p64 (poly64_t, poly64_t);
Performs widening polynomial multiplication on double-words low part. Available
on ARMv8 AArch32 and AArch64.

poly128_t vmull_high_p64 (poly64x2_t, poly64x2_t);
Performs widening polynomial multiplication on double-words high part.
Available on ARMv8 AArch32 and AArch64.

However, clang's arm_neon.h incorrectly restricts vmull_p64 support to AArch64
only.  (Additionally, it does *not* restrict it to __ARM_FEATURE_CRYPTO).

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