From 97c33d677f0130116ca40ca2e54a6aec7ad14961 Mon Sep 17 00:00:00 2001
From: Giacomo Travaglini <giacomo.travaglini@arm.com>
Date: Thu, 15 Feb 2018 15:15:22 +0000
Subject: cpu: Avoid unnecessary dynamic_pointer_cast in atomic model

In the atomic model a dynamic_pointer_cast is performed at every tick to
check if the fault is a SyscallRetryFault. This was happening even when
there was no generated fault.

Change-Id: I7f4afeffffdf4f988230e05286602d8d9a919c6c
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/10101
Reviewed-by: Brandon Potter <Brandon.Potter@amd.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
---
 src/cpu/simple/atomic.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/cpu/simple/atomic.cc b/src/cpu/simple/atomic.cc
index bc7670b23..7a368ab32 100644
--- a/src/cpu/simple/atomic.cc
+++ b/src/cpu/simple/atomic.cc
@@ -628,7 +628,8 @@ AtomicSimpleCPU::tick()
                     traceData = NULL;
                 }
 
-                if (dynamic_pointer_cast<SyscallRetryFault>(fault)) {
+                if (fault != NoFault &&
+                    dynamic_pointer_cast<SyscallRetryFault>(fault)) {
                     // Retry execution of system calls after a delay.
                     // Prevents immediate re-execution since conditions which
                     // caused the retry are unlikely to change every tick.
-- 
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