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[Qemu-devel] [PATCH 0/2] tcg/i386 guest_base improvements

From: Richard Henderson
Subject: [Qemu-devel] [PATCH 0/2] tcg/i386 guest_base improvements
Date: Sat, 4 Jun 2016 00:54:05 -0700

The first change does two things: (1) improve bsd-user so that it
doesn't continually reload guest_base into a temp register and
(2) extract the bulk of the guest_base logic to a routine that
is run once at startup.

The second change adds segmentation support to 32-bit linux.  There,
if we're using a guest base, we can save 3 bytes per memory op by
using a segment override.  In addition, if we're using a reserved_va,
we can set up the segment such that guest memory references are
constrained by the segment.



Richard Henderson (2):
  tcg/i386: Reserve register for guest_base if a segment isn't available
  tcg/i386: Use segment for 32-bit guest base on linux

 tcg/i386/tcg-target.inc.c | 181 +++++++++++++++++++++++++---------------------
 1 file changed, 100 insertions(+), 81 deletions(-)


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