From 0f81a44b37eec6e0b21bb95934d9fb529720591b Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Thu, 15 Nov 2018 00:51:41 -0800
Subject: perlasm: avoid rep ret

The original hardcodes returns as .byte 0xf3,0xc3, aka "rep ret".
We replace this by "ret". "rep ret" was meant to help with AMD K8
chips, cf. http://repzret.org/p/repzret. It makes no sense to
continue to use this kludge for code that won't even run on ancient
AMD chips.
---
 src/crypto/zinc/perlasm/x86_64-xlate.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/crypto/zinc/perlasm/x86_64-xlate.pl b/src/crypto/zinc/perlasm/x86_64-xlate.pl
index 8a18c5b..0fe1516 100644
--- a/src/crypto/zinc/perlasm/x86_64-xlate.pl
+++ b/src/crypto/zinc/perlasm/x86_64-xlate.pl
@@ -164,7 +164,7 @@ my %globals;
 		    $epilogue = "movq	8(%rsp),%rdi\n\t" .
 				"movq	16(%rsp),%rsi\n\t";
 		}
-	    	$epilogue . ".byte	0xf3,0xc3";
+		$epilogue . "ret";
 	    } elsif ($self->{op} eq "call" && !$elf && $current_segment eq ".init") {
 		".p2align\t3\n\t.quad";
 	    } else {
-- 
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