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The `__builtin_nop` function is documented only for PowerPC.
It was added to the other architectures by copy paste, but has no
known uses. So, remove `__builtin_nop` from all architectures
but PowerPC.
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In addressing modes for load and store instructions, the offset must be a multiple of the memory size being accessed. When accessing global variables, this may not be the case if the alignment of the variable is less than its size. Errors occur at link time.
This PR extends the check for a representable offset for the addressing of global
variables to also check whether the variable is correctly aligned. Only if both conditions are
met can we generate the short sequence Padrp / ADadr. Otherwise we go through the generic
loadsymbol sequence.
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"omega" fails in Coq 8.7, but not in 8.8 and later.
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The argument is of type Tlong, not Tint.
This caused spurious errors in RTLtyping.
Also: in AArch64/PrintOp.ml, print Cmaskl{zero,notzero} with "&l"
to distinguish them from Cmask{zero,notzero}.
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These instructions are generated by __builtin_memcpy.
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This commit adds a back-end for the AArch64 architecture, namely ARMv8
in 64-bit mode.
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