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- Reuse num_xmm_registers directly for the count of ZMM0-15 registers as is already done for the YMM registers for AVX rather than using a new variable that is always the same. - Replace 3 identical variables for the count of upper ZMM16-31 registers with a single variable. Make use of this to merge various loops working on the ZMM XSAVE region so that all of the handling for the various sub-registers in this region are always handled in a single loop. - While here, fix some bugs in i387_cache_to_xsave where if X86_XSTATE_ZMM was set on i386 (e.g. a 32-bit process on a 64-bit kernel), the -1 register nums would wrap around and store the value of GPRs in the XSAVE area. This should be harmless, but is definitely odd. Instead, check num_zmm_high_registers directly when checking X86_XSTATE_ZMM and skip the ZMM region handling entirely if the register count is 0. Approved-By: Simon Marchi <simon.marchi@efficios.com>
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