[Qemu-devel] [PATCH 04/13] target-openrisc: sync flags only when necessary

[Sebastian Macke]

Very often the delayed slot flag is set only to be removed
one instruction later. This patch sets this flag
only on instructions which could fail and at the end
of a translation block if necessary.

Signed-off-by: Sebastian Macke <address@hidden>
---
 target-openrisc/translate.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/target-openrisc/translate.c b/target-openrisc/translate.c
index 1bb686c..378ff1b 100644
--- a/target-openrisc/translate.c
+++ b/target-openrisc/translate.c
@@ -145,12 +145,14 @@ static inline void gen_sync_flags(DisasContext *dc)
 static void gen_exception(DisasContext *dc, unsigned int excp)
 {
     TCGv_i32 tmp = tcg_const_i32(excp);
+    gen_sync_flags(dc);
     gen_helper_exception(cpu_env, tmp);
     tcg_temp_free_i32(tmp);
 }
 
 static void gen_illegal_exception(DisasContext *dc)
 {
+    gen_sync_flags(dc);
     tcg_gen_movi_tl(cpu_pc, dc->pc);
     gen_exception(dc, EXCP_ILLEGAL);
     dc->is_jmp = DISAS_UPDATE;
@@ -244,7 +246,6 @@ static void gen_jump(DisasContext *dc, uint32_t imm, 
uint32_t reg, uint32_t op0)
 
     dc->delayed_branch = 2;
     dc->tb_flags |= D_FLAG;
-    gen_sync_flags(dc);
 }
 
 
@@ -703,6 +704,7 @@ static void gen_loadstore(DisasContext *dc, uint32 op0,
  */
 #if !defined(CONFIG_USER_ONLY)
     tcg_gen_movi_tl(cpu_pc, dc->pc);
+    gen_sync_flags(dc);
 #endif
 
     TCGv t0 = cpu_R[ra];
@@ -1788,6 +1790,8 @@ static inline void 
gen_intermediate_code_internal(OpenRISCCPU *cpu,
              && (dc->pc < next_page_start)
              && num_insns < max_insns);
 
+    gen_sync_flags(dc);
+
     if (tb->cflags & CF_LAST_IO) {
         gen_io_end();
     }
-- 
1.8.4.1