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ec/asm/ecp_nistz256-x86_64.pl: get corner case logic right.

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RT#4284

Reviewed-by: Rich Salz <rsalz@openssl.org>
This commit is contained in:
Andy Polyakov 2016-02-03 11:26:11 +01:00
parent e9fd82f624
commit d93753412b
1 changed files with 10 additions and 1 deletions
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11
crypto/ec/asm/ecp_nistz256-x86_64.pl
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@ -2044,6 +2044,7 @@ $code.=<<___;
push %r15
sub \$32*5+8, %rsp
.Lpoint_double_shortcut$x:
movdqu 0x00($a_ptr), %xmm0 # copy *(P256_POINT *)$a_ptr.x
mov $a_ptr, $b_ptr # backup copy
movdqu 0x10($a_ptr), %xmm1
@ -2334,6 +2335,7 @@ $code.=<<___;
mov 0x40+8*1($b_ptr), $acc6
mov 0x40+8*2($b_ptr), $acc7
mov 0x40+8*3($b_ptr), $acc0
movq $b_ptr, %xmm1
lea 0x40-$bias($b_ptr), $a_ptr
lea $Z1sqr(%rsp), $r_ptr # Z1^2
@ -2389,7 +2391,7 @@ $code.=<<___;
test $acc0, $acc0
jnz .Ladd_proceed$x # (in1infty || in2infty)?
test $acc1, $acc1
jz .Ladd_proceed$x # is_equal(S1,S2)?
jz .Ladd_double$x # is_equal(S1,S2)?
movq %xmm0, $r_ptr # restore $r_ptr
pxor %xmm0, %xmm0
@ -2401,6 +2403,13 @@ $code.=<<___;
movdqu %xmm0, 0x50($r_ptr)
jmp .Ladd_done$x
.align 32
.Ladd_double$x:
movq %xmm1, $a_ptr # restore $a_ptr
movq %xmm0, $r_ptr # restore $r_ptr
add \$`32*(18-5)`, %rsp # difference in frame sizes
jmp .Lpoint_double_shortcut$x
.align 32
.Ladd_proceed$x:
`&load_for_sqr("$R(%rsp)", "$src0")`