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Microoptimize the return path for the fast syscalls on amd64. Arrange
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Description

Microoptimize the return path for the fast syscalls on amd64. Arrange
the code to have the fall-through path to follow the likely target.
Do not use intermediate register to reload user %rsp.

Proposed by: alc
Reviewed by: alc, jhb
Approved by: re (bz)
MFC after: 2 weeks

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kibAuthored on
Parents
rS225574: Correct the RFC number for the description of IPv6 privacy addressing
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head/
sys/
amd64/
amd64/

rS225575

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head/sys/amd64/amd64/exception.S

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