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The GPL makes sense for whole applications, but the dual-licensed Coq
and OCaml files are more like libraries to be combined with other
code, so the LGPL is more appropriate.
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The configure script still accepts "macosx" for backward compatibility,
but every other part of CompCert now uses "macos".
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This commit adds support for macOS (and probably iOS) running on
AArch64 / ARM 64-bit / "Apple silicon" processors.
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The corresponding files in all other ports are dual-licensed
(GPL + non-commercial), there is no reason it should be different for
aarch64.
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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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This commit adds a back-end for the AArch64 architecture, namely ARMv8
in 64-bit mode.
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