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arch/x86: (Intel64) move RAX to volatile register set

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This used to be part of the "restore always" set of registers because
__swap was expected to return a value.  No longer required, so RAX is
moved to the volatile registers and we save a few cycles occasionally.

Signed-off-by: Charles E. Youse <charles.youse@intel.com>
This commit is contained in:
Charles E. Youse 2019-09-23 16:39:11 -04:00 • committed by Andrew Boie
commit 66a2ed2360
4 changed files with 4 additions and 4 deletions
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arch/x86/include/intel64/offsets_short_arch.h
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@ -36,7 +36,7 @@
(___thread_t_callee_saved_OFFSET + ___callee_saved_t_rflags_OFFSET)
#define _thread_offset_to_rax \
(___thread_t_callee_saved_OFFSET + ___callee_saved_t_rax_OFFSET)
(___thread_t_arch_OFFSET + ___thread_arch_t_rax_OFFSET)
#define _thread_offset_to_rcx \
(___thread_t_arch_OFFSET + ___thread_arch_t_rcx_OFFSET)