From 4be27dbbde2aed1da305b83043caa6f0f0ca4309 Mon Sep 17 00:00:00 2001 From: pbrook Date: Wed, 22 Oct 2008 16:14:08 +0000 Subject: [PATCH] Optimize redundant cp15 coprocessor access control register writes. Signed-off-by: Paul Brook git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5512 c046a42c-6fe2-441c-8c8c-71466251a162 --- target-arm/helper.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/target-arm/helper.c b/target-arm/helper.c index b9a8f78b2c..d4af8595ca 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -1334,9 +1334,11 @@ void HELPER(set_cp15)(CPUState *env, uint32_t insn, uint32_t val) case 2: if (arm_feature(env, ARM_FEATURE_XSCALE)) goto bad_reg; - env->cp15.c1_coproc = val; - /* ??? Is this safe when called from within a TB? */ - tb_flush(env); + if (env->cp15.c1_coproc != val) { + env->cp15.c1_coproc = val; + /* ??? Is this safe when called from within a TB? */ + tb_flush(env); + } break; default: goto bad_reg; -- 2.11.0