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Over the years, the undocumented operand modifier used to produce the unprefixed constant values in __einfo_error() has varied from "%c0" to "%a0" in commit1a77466("[build] Fix use of inline assembly on GCC 4.8 ARM64 builds") and back to "%c0" in commit3fb3ffc("[build] Fix use of inline assembly on GCC 8 ARM64 builds"), according to the evolving demands of the toolchain. LoongArch64 suffers from a similar issue: GCC 13 will allow either, but the currently released GCC 12 allows only the "%a0" form. Introduce a macro ASM_NO_PREFIX, defined in bits/compiler.h, to abstract away this difference and allow different architectures to use different operand modifiers. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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