From dee96f6ca300da3dc3bc97635d9c3d97a73b5e48 Mon Sep 17 00:00:00 2001
From: j_mayer <j_mayer@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Sat, 29 Sep 2007 15:02:38 +0000
Subject: PowerPC emulation optimization: avoid stopping translation after most
 SPR updates when a context-synchronization instruction is also needed.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3265 c046a42c-6fe2-441c-8c8c-71466251a162
---
 target-ppc/translate.c      | 12 ++++++++++--
 target-ppc/translate_init.c | 43 -------------------------------------------
 2 files changed, 10 insertions(+), 45 deletions(-)

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index dc4e758914..e88cfafaee 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -3230,7 +3230,8 @@ GEN_HANDLER(mtmsrd, 0x1F, 0x12, 0x05, 0x001FF801, PPC_64B)
     gen_op_load_gpr_T0(rS(ctx->opcode));
     gen_op_store_msr();
     /* Must stop the translation as machine state (may have) changed */
-    GEN_SYNC(ctx);
+    /* Note that mtmsr is not always defined as context-synchronizing */
+    GEN_STOP(ctx);
 #endif
 }
 #endif
@@ -3253,7 +3254,8 @@ GEN_HANDLER(mtmsr, 0x1F, 0x12, 0x04, 0x001FF801, PPC_MISC)
 #endif
         gen_op_store_msr();
     /* Must stop the translation as machine state (may have) changed */
-    GEN_SYNC(ctx);
+    /* Note that mtmsrd is not always defined as context-synchronizing */
+    GEN_STOP(ctx);
 #endif
 }
 
@@ -4936,6 +4938,9 @@ GEN_HANDLER(wrtee, 0x1F, 0x03, 0x04, 0x000FFC01, PPC_EMB_COMMON)
     }
     gen_op_load_gpr_T0(rD(ctx->opcode));
     gen_op_wrte();
+    /* Stop translation to have a chance to raise an exception
+     * if we just set msr_ee to 1
+     */
     GEN_STOP(ctx);
 #endif
 }
@@ -4952,6 +4957,9 @@ GEN_HANDLER(wrteei, 0x1F, 0x03, 0x05, 0x000EFC01, PPC_EMB_COMMON)
     }
     gen_op_set_T0(ctx->opcode & 0x00010000);
     gen_op_wrte();
+    /* Stop translation to have a chance to raise an exception
+     * if we just set msr_ee to 1
+     */
     GEN_STOP(ctx);
 #endif
 }
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index 109dcdc256..53a6abf9c8 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -189,34 +189,22 @@ static void spr_read_ibat_h (void *opaque, int sprn)
 
 static void spr_write_ibatu (void *opaque, int sprn)
 {
-    DisasContext *ctx = opaque;
-
     gen_op_store_ibatu((sprn - SPR_IBAT0U) / 2);
-    GEN_STOP(ctx);
 }
 
 static void spr_write_ibatu_h (void *opaque, int sprn)
 {
-    DisasContext *ctx = opaque;
-
     gen_op_store_ibatu((sprn - SPR_IBAT4U) / 2);
-    GEN_STOP(ctx);
 }
 
 static void spr_write_ibatl (void *opaque, int sprn)
 {
-    DisasContext *ctx = opaque;
-
     gen_op_store_ibatl((sprn - SPR_IBAT0L) / 2);
-    GEN_STOP(ctx);
 }
 
 static void spr_write_ibatl_h (void *opaque, int sprn)
 {
-    DisasContext *ctx = opaque;
-
     gen_op_store_ibatl((sprn - SPR_IBAT4L) / 2);
-    GEN_STOP(ctx);
 }
 
 /* DBAT0U...DBAT7U */
@@ -233,34 +221,22 @@ static void spr_read_dbat_h (void *opaque, int sprn)
 
 static void spr_write_dbatu (void *opaque, int sprn)
 {
-    DisasContext *ctx = opaque;
-
     gen_op_store_dbatu((sprn - SPR_DBAT0U) / 2);
-    GEN_STOP(ctx);
 }
 
 static void spr_write_dbatu_h (void *opaque, int sprn)
 {
-    DisasContext *ctx = opaque;
-
     gen_op_store_dbatu((sprn - SPR_DBAT4U) / 2);
-    GEN_STOP(ctx);
 }
 
 static void spr_write_dbatl (void *opaque, int sprn)
 {
-    DisasContext *ctx = opaque;
-
     gen_op_store_dbatl((sprn - SPR_DBAT0L) / 2);
-    GEN_STOP(ctx);
 }
 
 static void spr_write_dbatl_h (void *opaque, int sprn)
 {
-    DisasContext *ctx = opaque;
-
     gen_op_store_dbatl((sprn - SPR_DBAT4L) / 2);
-    GEN_STOP(ctx);
 }
 
 /* SDR1 */
@@ -271,10 +247,7 @@ static void spr_read_sdr1 (void *opaque, int sprn)
 
 static void spr_write_sdr1 (void *opaque, int sprn)
 {
-    DisasContext *ctx = opaque;
-
     gen_op_store_sdr1();
-    GEN_STOP(ctx);
 }
 
 /* 64 bits PowerPC specific SPRs */
@@ -291,7 +264,6 @@ static void spr_write_asr (void *opaque, int sprn)
     DisasContext *ctx = opaque;
 
     gen_op_store_asr();
-    GEN_STOP(ctx);
 }
 #endif
 #endif
@@ -329,18 +301,12 @@ static void spr_read_601_ubat (void *opaque, int sprn)
 
 static void spr_write_601_ubatu (void *opaque, int sprn)
 {
-    DisasContext *ctx = opaque;
-
     gen_op_store_601_batu((sprn - SPR_IBAT0U) / 2);
-    GEN_STOP(ctx);
 }
 
 static void spr_write_601_ubatl (void *opaque, int sprn)
 {
-    DisasContext *ctx = opaque;
-
     gen_op_store_601_batl((sprn - SPR_IBAT0L) / 2);
-    GEN_STOP(ctx);
 }
 #endif
 
@@ -367,13 +333,7 @@ static void spr_write_40x_dbcr0 (void *opaque, int sprn)
 
 static void spr_write_40x_sler (void *opaque, int sprn)
 {
-    DisasContext *ctx = opaque;
-
     gen_op_store_40x_sler();
-    /* We must stop the translation as we may have changed
-     * some regions endianness
-     */
-    GEN_STOP(ctx);
 }
 
 static void spr_write_booke_tcr (void *opaque, int sprn)
@@ -397,10 +357,7 @@ static void spr_read_403_pbr (void *opaque, int sprn)
 
 static void spr_write_403_pbr (void *opaque, int sprn)
 {
-    DisasContext *ctx = opaque;
-
     gen_op_store_403_pb(sprn - SPR_403_PBL1);
-    GEN_STOP(ctx);
 }
 
 static void spr_write_pir (void *opaque, int sprn)
-- 
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