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bn: Switch $i to be unused r9

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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)
This commit is contained in:
Martin Schwenke 2021-06-16 16:37:15 +10:00 committed by Pauli
parent 77bd294bd0
commit 5b7f986457
1 changed files with 3 additions and 5 deletions
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8
crypto/bn/asm/ppc64-mont-fixed.pl
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@ -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]
___
}