Messages in this thread | | | From | David Laight <> | Subject | RE: [RFC PATCH v2 1/2] rseq: x86: implement abort-at-ip extension | Date | Wed, 12 Jan 2022 14:58:14 +0000 |
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> * [*] The openrisc, powerpc64 and x86-64 architectures define a "redzone" as a > * stack area beyond the stack pointer which can be used by the compiler > * to store local variables in leaf functions.
I wonder if that is really worth the trouble it causes! By the time a function is spilling values to stack the cost of a %sp update is almost certainly noise.
Someone clearly thought it was a 'good idea (tm)'.
David
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