[boost] [context] SSE/AVX registers preservation

Subject: [boost] [context] SSE/AVX registers preservation
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2013-07-09 03:37:36

Hi,

I've been looking at Boost.Context and wondering whether it preserves
SSE/AVX state on context switches. From the code it doesn't look like
the case - only jump_x86_64_ms_pe_masm.asm contains the code that
saves some (not all) xmm registers and ymm registers are never saved.
Is this intentional or the library simply doesn't support SSE/AVX? And
why not use xsave/xrstor to consistently support all future
extensions?