From f9b549fbf572ac1b8b40ee86411eb9331a2bf458 Mon Sep 17 00:00:00 2001
From: Hoa Nguyen <hoanguyen@ucdavis.edu>
Date: Fri, 12 Jul 2019 12:09:30 -0700
Subject: arch-x86: add unconditional tag to calls/returns

The branch predictor checks whether an instruction is unconditional
branch before adding it or checking the RAS. With this change, the
RAS is significantly more effective for short running x86 workloads.

Change-Id: I60af5f2f583b898ad77f79f4b0478d6cda88fc21
Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/19448
Maintainer: Jason Lowe-Power <jason@lowepower.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
---
 src/arch/x86/isa/macroop.isa | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src/arch')

diff --git a/src/arch/x86/isa/macroop.isa b/src/arch/x86/isa/macroop.isa
index 7d729618a..99d76b48c 100644
--- a/src/arch/x86/isa/macroop.isa
+++ b/src/arch/x86/isa/macroop.isa
@@ -226,8 +226,10 @@ let {{
 
                     if self.function_call:
                         flags.append("IsCall")
+                        flags.append("IsUncondControl")
                     if self.function_return:
                         flags.append("IsReturn")
+                        flags.append("IsUncondControl")
                 else:
                     flags.append("IsDelayedCommit")
 
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