Every story and comment from the Hacker News API, in a layout borrowed from 2001.
A comment on AMD ymm registers are rolling back. Parent comment
The XSAVES instruction may fail to save XMM registers to the provided state save area if all of the following are true:
• All XMM registers were restored to the initialization value by the most recent XRSTORS instruction because the XSTATE_BV[SSE] bit was clear.
• The state save area for the XMM registers does not contain the initialization state.
• The value in the XMM registers match the initialization value when the XSAVES instruction is executed.
• The MXCSR register has been modified to a value different from the initialization value since the most recent XRSTORS instruction.
There are no comments on this comment yet.
The XSAVES instruction may fail to save XMM registers to the provided state save area if all of the following are true:
• All XMM registers were restored to the initialization value by the most recent XRSTORS instruction because the XSTATE_BV[SSE] bit was clear.
• The state save area for the XMM registers does not contain the initialization state.
• The value in the XMM registers match the initialization value when the XSAVES instruction is executed.
• The MXCSR register has been modified to a value different from the initialization value since the most recent XRSTORS instruction.