Revert "Disable big-endian simd in swap_nonoverlapping_bytes"
This reverts commit 77bd4dc654
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Issue #42778 was formerly easy to reproduce on two big-endian targets,
`powerpc64` and `s390x`, so we disabled SIMD on this function for all
big-endian targets as a workaround.
I have re-tested this code on `powerpc64` and `s390x`, each with the
bundled LLVM 8 and with external LLVM 7 and LLVM 6, and the problems no
longer appear. So it seems safe to remove this workaround, although I'm
still a little uncomfortable that we never found a root-cause...
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@ -374,10 +374,7 @@ unsafe fn swap_nonoverlapping_bytes(x: *mut u8, y: *mut u8, len: usize) {
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// #[repr(simd)], even if we don't actually use this struct directly.
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//
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// FIXME repr(simd) broken on emscripten and redox
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// It's also broken on big-endian powerpc64 and s390x. #42778
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#[cfg_attr(not(any(target_os = "emscripten", target_os = "redox",
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target_endian = "big")),
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repr(simd))]
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#[cfg_attr(not(any(target_os = "emscripten", target_os = "redox")), repr(simd))]
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struct Block(u64, u64, u64, u64);
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struct UnalignedBlock(u64, u64, u64, u64);
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