================
@@ -321,9 +321,11 @@ void aarch64::getAArch64TargetFeatures(const Driver &D,
}
}
- if (Arg *A = Args.getLastArg(options::OPT_mno_unaligned_access,
- options::OPT_munaligned_access)) {
- if (A->getOption().matches(options::OPT_mno_unaligned_access))
+ if (Arg *A = Args.getLastArg(
+ options::OPT_mstrict_align, options::OPT_mno_strict_align,
+ options::OPT_mno_unaligned_access, options::OPT_munaligned_access)) {
+ if (A->getOption().matches(options::OPT_mstrict_align) ||
+ A->getOption().matches(options::OPT_mno_unaligned_access))
----------------
smithp35 wrote:
Preventing unaligned access can be useful in AArch64, it is an option we do use
to build our embedded C-libraries with (not a focus for GCC). It is documented
in the toolchain manual
https://developer.arm.com/documentation/101754/0621/armclang-Reference/armclang-Command-line-Options/-munaligned-access---mno-unaligned-access
In summary, we'd like to keep it for AArch64.
AArch64 always has the option of using unaligned accesses, but they can be
disabled by writing the SCTLR register, and accesses to Device memory always
need to be aligned. Code that runs before the MMU is enabled runs as if Device
memory.
```
Unaligned accesses to Normal memory
The behavior of unaligned accesses to Normal memory is dependent on all of the
following:
• The instruction causing the memory access.
• The memory attributes of the accessed memory.
• The value of SCTLR_ELx.{A, nAA}.
• Whether or not FEAT_LSE2 is implemented.
```
https://github.com/llvm/llvm-project/pull/85350
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