[openssl-commits] [openssl] OpenSSL_1_1_0-stable update

[Andy Polyakov]

The branch OpenSSL_1_1_0-stable has been updated
       via  7fb37eed05059e1b135ef5818fb9f2b3b93b8daa (commit)
      from  c8ec34109cab8c92685958ddfef0776a4b3b8460 (commit)


- Log -----------------------------------------------------------------
commit 7fb37eed05059e1b135ef5818fb9f2b3b93b8daa
Author: Andy Polyakov <ap...@openssl.org>
Date:   Sat Jun 3 21:08:57 2017 +0200

    ec/asm/ecp_nistz256-x86_64.pl: minor sqr_montx cleanup.
    
    Drop some redundant instructions in reduction in ecp_nistz256_sqr_montx.
    
    Reviewed-by: Rich Salz <rs...@openssl.org>
    (cherry picked from commit 8fc063dcc9668589fd95533d25932396d60987f9)

-----------------------------------------------------------------------

Summary of changes:
 crypto/ec/asm/ecp_nistz256-x86_64.pl | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/crypto/ec/asm/ecp_nistz256-x86_64.pl 
b/crypto/ec/asm/ecp_nistz256-x86_64.pl
index 16b6639..714e852 100755
--- a/crypto/ec/asm/ecp_nistz256-x86_64.pl
+++ b/crypto/ec/asm/ecp_nistz256-x86_64.pl
@@ -1185,19 +1185,18 @@ __ecp_nistz256_sqr_montx:
        adox    $t1, $acc5
        .byte   0x67,0x67
        mulx    %rdx, $t0, $t4
-        mov    $acc0, %rdx
+        mov    .Lpoly+8*3(%rip), %rdx
        adox    $t0, $acc6
         shlx   $a_ptr, $acc0, $t0
        adox    $t4, $acc7
         shrx   $a_ptr, $acc0, $t4
-        mov    .Lpoly+8*3(%rip), $t1
+       mov     %rdx,$t1
 
        # reduction step 1
        add     $t0, $acc1
        adc     $t4, $acc2
 
-       mulx    $t1, $t0, $acc0
-        mov    $acc1, %rdx
+       mulx    $acc0, $t0, $acc0
        adc     $t0, $acc3
         shlx   $a_ptr, $acc1, $t0
        adc     \$0, $acc0
@@ -1207,8 +1206,7 @@ __ecp_nistz256_sqr_montx:
        add     $t0, $acc2
        adc     $t4, $acc3
 
-       mulx    $t1, $t0, $acc1
-        mov    $acc2, %rdx
+       mulx    $acc1, $t0, $acc1
        adc     $t0, $acc0
         shlx   $a_ptr, $acc2, $t0
        adc     \$0, $acc1
@@ -1218,8 +1216,7 @@ __ecp_nistz256_sqr_montx:
        add     $t0, $acc3
        adc     $t4, $acc0
 
-       mulx    $t1, $t0, $acc2
-        mov    $acc3, %rdx
+       mulx    $acc2, $t0, $acc2
        adc     $t0, $acc1
         shlx   $a_ptr, $acc3, $t0
        adc     \$0, $acc2
@@ -1229,12 +1226,12 @@ __ecp_nistz256_sqr_montx:
        add     $t0, $acc0
        adc     $t4, $acc1
 
-       mulx    $t1, $t0, $acc3
+       mulx    $acc3, $t0, $acc3
        adc     $t0, $acc2
        adc     \$0, $acc3
 
-       xor     $t3, $t3                # cf=0
-       adc     $acc0, $acc4            # accumulate upper half
+       xor     $t3, $t3
+       add     $acc0, $acc4            # accumulate upper half
         mov    .Lpoly+8*1(%rip), $a_ptr
        adc     $acc1, $acc5
         mov    $acc4, $acc0
@@ -1243,8 +1240,7 @@ __ecp_nistz256_sqr_montx:
         mov    $acc5, $acc1
        adc     \$0, $t3
 
-       xor     %eax, %eax              # cf=0
-       sbb     \$-1, $acc4             # .Lpoly[0]
+       sub     \$-1, $acc4             # .Lpoly[0]
         mov    $acc6, $acc2
        sbb     $a_ptr, $acc5           # .Lpoly[1]
        sbb     \$0, $acc6              # .Lpoly[2]
_____
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