[Qemu-devel] [PATCH 06/25] target-openrisc: Put SR[OVE] in TB flags

[Richard Henderson <rth@twiddle.net>]

Removes a call at execution time for overflow exceptions.

Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 target-openrisc/cpu.h              |  4 ++--
 target-openrisc/exception_helper.c |  2 +-
 target-openrisc/translate.c        | 24 +++++++++++++++---------
 3 files changed, 18 insertions(+), 12 deletions(-)

diff --git a/target-openrisc/cpu.h b/target-openrisc/cpu.h
index 1ea7607..af63f58 100644
--- a/target-openrisc/cpu.h
+++ b/target-openrisc/cpu.h
@@ -396,8 +396,8 @@ static inline void cpu_get_tb_cpu_state(CPUOpenRISCState *env,
 {
     *pc = env->pc;
     *cs_base = 0;
-    /* D_FLAG -- branch instruction exception */
-    *flags = (env->flags & D_FLAG);
+    /* D_FLAG -- branch instruction exception, OVE overflow trap enable.  */
+    *flags = (env->flags & D_FLAG) | (env->sr & SR_OVE);
 }
 
 static inline int cpu_mmu_index(CPUOpenRISCState *env, bool ifetch)
diff --git a/target-openrisc/exception_helper.c b/target-openrisc/exception_helper.c
index 561384a..6ae795f 100644
--- a/target-openrisc/exception_helper.c
+++ b/target-openrisc/exception_helper.c
@@ -31,7 +31,7 @@ void HELPER(exception)(CPUOpenRISCState *env, uint32_t excp)
 
 void HELPER(ove)(CPUOpenRISCState *env, target_ulong test)
 {
-    if (unlikely(test) && (env->sr & SR_OVE)) {
+    if (unlikely(test)) {
         OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
         CPUState *cs = CPU(cpu);
 
diff --git a/target-openrisc/translate.c b/target-openrisc/translate.c
index 48bd5f7..1cb726a 100644
--- a/target-openrisc/translate.c
+++ b/target-openrisc/translate.c
@@ -130,8 +130,8 @@ static inline int sign_extend(unsigned int val, int width)
 static inline void gen_sync_flags(DisasContext *dc)
 {
     /* Sync the tb dependent flag between translate and runtime.  */
-    if (dc->tb_flags != dc->synced_flags) {
-        tcg_gen_movi_tl(env_flags, dc->tb_flags);
+    if ((dc->tb_flags ^ dc->synced_flags) & D_FLAG) {
+        tcg_gen_movi_tl(env_flags, dc->tb_flags & D_FLAG);
         dc->synced_flags = dc->tb_flags;
     }
 }
@@ -250,20 +250,26 @@ static void gen_jump(DisasContext *dc, uint32_t imm, uint32_t reg, uint32_t op0)
 
 static void gen_ove_cy(DisasContext *dc, TCGv cy)
 {
-    gen_helper_ove(cpu_env, cy);
+    if (dc->tb_flags & SR_OVE) {
+        gen_helper_ove(cpu_env, cy);
+    }
 }
 
 static void gen_ove_ov(DisasContext *dc, TCGv ov)
 {
-    gen_helper_ove(cpu_env, ov);
+    if (dc->tb_flags & SR_OVE) {
+        gen_helper_ove(cpu_env, ov);
+    }
 }
 
 static void gen_ove_cyov(DisasContext *dc, TCGv cy, TCGv ov)
 {
-    TCGv t0 = tcg_temp_new();
-    tcg_gen_or_tl(t0, cy, ov);
-    gen_helper_ove(cpu_env, t0);
-    tcg_temp_free(t0);
+    if (dc->tb_flags & SR_OVE) {
+        TCGv t0 = tcg_temp_new();
+        tcg_gen_or_tl(t0, cy, ov);
+        gen_helper_ove(cpu_env, t0);
+        tcg_temp_free(t0);
+    }
 }
 
 static void gen_add(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
@@ -1430,7 +1436,7 @@ void gen_intermediate_code(CPUOpenRISCState *env, struct TranslationBlock *tb)
     dc->flags = cpu->env.cpucfgr;
     dc->mem_idx = cpu_mmu_index(&cpu->env, false);
     dc->synced_flags = dc->tb_flags = tb->flags;
-    dc->delayed_branch = !!(dc->tb_flags & D_FLAG);
+    dc->delayed_branch = (dc->tb_flags & D_FLAG) != 0;
     dc->singlestep_enabled = cs->singlestep_enabled;
     if (qemu_loglevel_mask(CPU_LOG_TB_IN_ASM)) {
         qemu_log("-----------------------------------------\n");
-- 
2.5.5