From 112e4518f0d38fc3c52e55c7d7e77b66a295ec2b Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@twiddle.net>
Date: Wed, 5 Aug 2015 11:04:11 -0700
Subject: target-alpha: Special case cmpbge with zero

Knowing the comparator is zero leads to a simpler operation.

Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 target-alpha/translate.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'target-alpha/translate.c')

diff --git a/target-alpha/translate.c b/target-alpha/translate.c
index 81d4ff827c..b766ae3daa 100644
--- a/target-alpha/translate.c
+++ b/target-alpha/translate.c
@@ -1507,7 +1507,12 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
             break;
         case 0x0F:
             /* CMPBGE */
-            gen_helper_cmpbge(vc, va, vb);
+            if (ra == 31) {
+                /* Special case 0 >= X as X == 0.  */
+                gen_helper_cmpbe0(vc, vb);
+            } else {
+                gen_helper_cmpbge(vc, va, vb);
+            }
             break;
         case 0x12:
             /* S8ADDL */
-- 
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