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[Qemu-devel] [PATCH 0/3] powerpc tcg backend improvements
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 0/3] powerpc tcg backend improvements |
Date: |
Tue, 13 Oct 2015 08:23:45 +1100 |
I happened to notice the ppc backend had a dependency on the placement
of the prologue, which has just changed. There is a 32 byte window at
code_gen_buffer + 16MB where we might do the wrong thing.
The second patch reduces the code size reserved for performing goto_tb
from 7 insns to 4. We probably haven't emitted all 7 insns for quite
some time, since the TCG_REG_RA patch went in. But in the process,
allow for the atomic update of the insns, something that I could see
being required eventually.
The third patch is a guess. But it matches the preferences in gcc,
giving out-of-order processors a tad more freedom by avoiding cr0
when possible.
Anyway, I've been running an alpha guest on a ppc64le host with these
patches for a week now.
r~
Richard Henderson (3):
tcg/ppc: Adjust exit_tb for change in prologue placement
tcg/ppc: Revise goto_tb implementation
tcg/ppc: Prefer mask over andi.
tcg/ppc/tcg-target.c | 79 ++++++++++++++++++++++++++++++++++------------------
translate-all.c | 2 ++
2 files changed, 54 insertions(+), 27 deletions(-)
--
2.4.3
- [Qemu-devel] [PATCH 0/3] powerpc tcg backend improvements,
Richard Henderson <=