From: Martin Schwenke <martin@meltin.net>
Date: Wed, 16 Jun 2021 06:37:15 +0000 (+1000)
Subject: bn: Switch $i to be unused r9
X-Git-Tag: openssl-3.0.0-beta2~249
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5b7f986457d2ae181de9475a3d303e6ba4a3b16c;p=thirdparty%2Fopenssl.git

bn: Switch $i to be unused r9

No need to save/restore because it is volatile.

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15798)
---

diff --git a/crypto/bn/asm/ppc64-mont-fixed.pl b/crypto/bn/asm/ppc64-mont-fixed.pl
index 941882ec82f..bb4290182db 100755
--- a/crypto/bn/asm/ppc64-mont-fixed.pl
+++ b/crypto/bn/asm/ppc64-mont-fixed.pl
@@ -72,6 +72,7 @@ my $np	= "r6";
 my $n0	= "r7";
 my $num	= "r8";
 
+my $i	= "r9";
 my $c0	= "r10";
 my $bp0	= "r11";
 my $bpi	= "r11";
@@ -81,7 +82,6 @@ my $apj	= "r12";
 my $npj	= "r12";
 my $lo	= "r14";
 my $c1	= "r14";
-my $i	= "r15";
 
 # Non-volatile registers used for tp[i]
 #
@@ -346,12 +346,11 @@ sub save_registers($)
 
 	$self->add_code(<<___);
 	mtvsrd	$vsrs[0],$lo
-	mtvsrd	$vsrs[1],$i
 ___
 
 	for (my $j = 0; $j <= $n+1; $j++) {
 		$self->{code}.=<<___;
-	mtvsrd	$vsrs[$j+2],$tp[$j]
+	mtvsrd	$vsrs[$j+1],$tp[$j]
 ___
 	}
 
@@ -368,12 +367,11 @@ sub restore_registers($)
 
 	$self->add_code(<<___);
 	mfvsrd	$lo,$vsrs[0]
-	mfvsrd	$i,$vsrs[1]
 ___
 
 	for (my $j = 0; $j <= $n+1; $j++) {
 		$self->{code}.=<<___;
-	mfvsrd	$tp[$j],$vsrs[$j+2]
+	mfvsrd	$tp[$j],$vsrs[$j+1]
 ___
 	}