cdce149050
f2747d1602ec4e1128356b861b2167daf66a845b build: Restrict check for CRC32C intrinsic to aarch64 (W. J. van der Laan)
Pull request description:
`crc32c`'s hardware accelerated code doesn't handle ARM 32-bit at all, but only 64-bit. Make the check in `configure.ac` check for this architecture explicitly. This change does not affect non-ARM architectures.
For the release binaries, the current `configure.ac` check happens to work: it enables it on aarch64 but disables it for armhf. However some combination of compiler version and settings can cause this check to succeed on armhf (as reported on IRC). So make the 64-bit platform requirement explicit.
(details: while the check already explicitly checks the `__crc32d` intrinsic, which strictly doesn't exist on 32-bit ARM, this is not enough! gcc happens to helpfully emulate it:
> These built-in intrinsics for the ARMv8-A CRC32 extension are available when the -march=armv8-a+crc switch is used "uint32_t __crc32d (uint32_t, uint64_t)" Form of expected instruction(s): Two crc32w r0, r0, r0 instructions for AArch32
)
ACKs for top commit:
luke-jr:
re-tACK f2747d1602ec4e1128356b861b2167daf66a845b
jarolrod:
ACK f2747d1602ec4e1128356b861b2167daf66a845b
Tree-SHA512: e5f05f05eeec310ac42685621d86862735586be66dc378db404ec9414ac5aaea7c53d76d76d875b15b11924eee6714076120c07b077183fd7af898704fd81823
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