## ALP Programming Guide and Reference

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### Notes

INVD should be used with care. It does not write back modified cache lines; therefore, it can cause the data cache to become inconsistent with other memories in the system. Unless there is a specific requirement or benefit to invalidate a cache without writing back the modified lines (i.e., testing or fault recovery where cache coherency with main memory is not a concern), software should use the WBINVD instruction.

This instruction is implementation-dependent; its function may be implemented differently on future Intel processors.

This instruction does not wait for the external cache to complete its invalidation before the processor proceeds. It is the responsibility of hardware to respond to the external cache invalidation indication.

This instruction is not supported on Intel386 processors. See the Intel documentation for CPUID detection at runtime. See the WBINVD description to write back dirty data to memory.

See the Intel documentation for information on disabling the cache.