From 20132b96055e1da1d114067c15bf53e78a25d1c4 Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@twiddle.net>
Date: Tue, 9 Oct 2012 14:50:00 -0700
Subject: target-sparc: Don't compute full flags value so often

Avoid speculatively computing flags before every potentially trapping
operation and instead do the flags computation when a trap actually
occurs.  This gives approximately 30% speedup in emulation.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
---
 linux-user/main.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'linux-user/main.c')

diff --git a/linux-user/main.c b/linux-user/main.c
index 9f3476b..f4bbe69 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -1114,6 +1114,11 @@ void cpu_loop (CPUSPARCState *env)
     while (1) {
         trapnr = cpu_sparc_exec (env);
 
+        /* Compute PSR before exposing state.  */
+        if (env->cc_op != CC_OP_FLAGS) {
+            cpu_get_psr(env);
+        }
+
         switch (trapnr) {
 #ifndef TARGET_SPARC64
         case 0x88:
-- 
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