0ad46889a1
X15 must be zero at function calls and returns, but can be used as scratch in the middle of a function. This allows things like memmove and the hashing functions to use X15 temporarily, as long as they set it back to 0 before returning. This CL also clarifies the distinction between register meanings on function call versus function return, since some of them have fixed meanings at both call and return, while others only have a fixed meaning at calls. Updates #40724. Change-Id: I9dad3abde42cd4d2788e8435cde6d55073dd75a3 Reviewed-on: https://go-review.googlesource.com/c/go/+/308929 Trust: Austin Clements <austin@google.com> Reviewed-by: Cherry Zhang <cherryyz@google.com> |
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