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CompCert doesn't maintain a frame pointer in X29. However, it must treat
X29 as callee-save, so that CompCert-generated code can be called from code
that uses X29 as frame pointer.
This commit makes X29 callee-save. In places where X29 was used as a
temporary, X15 or X14 is used instead.
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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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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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