sub $Xfer,$Xfer,()

in crypto/sha512-armv8.pl [673:748]

• 68 lines of code
• 1 McCabe index (conditional complexity)

	sub	$Xfer,$Xfer,#32

	ldp	$A,$B,[$ctx]
	ldp	$C,$D,[$ctx,#8]
	ldp	$E,$F,[$ctx,#16]
	ldp	$G,$H,[$ctx,#24]
	ldr	$t1,[sp,#0]
	mov	$t2,wzr
	eor	$t3,$B,$C
	mov	$t4,wzr
	b	.L_00_48

.align	4
.L_00_48:
___
	&Xupdate(\&body_00_15);
	&Xupdate(\&body_00_15);
	&Xupdate(\&body_00_15);
	&Xupdate(\&body_00_15);
$code.=<<___;
	cmp	$t1,#0				// check for K256 terminator
	ldr	$t1,[sp,#0]
	sub	$Xfer,$Xfer,#64
	bne	.L_00_48

	sub	$Ktbl,$Ktbl,#256		// rewind $Ktbl
	cmp	$inp,$num
	mov	$Xfer, #64
	csel	$Xfer, $Xfer, xzr, eq
	sub	$inp,$inp,$Xfer			// avoid SEGV
	mov	$Xfer,sp
___
	&Xpreload(\&body_00_15);
	&Xpreload(\&body_00_15);
	&Xpreload(\&body_00_15);
	&Xpreload(\&body_00_15);
$code.=<<___;
	add	$A,$A,$t4			// h+=Sigma0(a) from the past
	ldp	$t0,$t1,[$ctx,#0]
	add	$A,$A,$t2			// h+=Maj(a,b,c) from the past
	ldp	$t2,$t3,[$ctx,#8]
	add	$A,$A,$t0			// accumulate
	add	$B,$B,$t1
	ldp	$t0,$t1,[$ctx,#16]
	add	$C,$C,$t2
	add	$D,$D,$t3
	ldp	$t2,$t3,[$ctx,#24]
	add	$E,$E,$t0
	add	$F,$F,$t1
	 ldr	$t1,[sp,#0]
	stp	$A,$B,[$ctx,#0]
	add	$G,$G,$t2
	 mov	$t2,wzr
	stp	$C,$D,[$ctx,#8]
	add	$H,$H,$t3
	stp	$E,$F,[$ctx,#16]
	 eor	$t3,$B,$C
	stp	$G,$H,[$ctx,#24]
	 mov	$t4,wzr
	 mov	$Xfer,sp
	b.ne	.L_00_48

	ldr	x29,[x29]
	add	sp,sp,#16*4+16
	ret
.size	sha256_block_neon,.-sha256_block_neon
___
}

$code.=<<___;
#ifndef	__KERNEL__
.comm	OPENSSL_armcap_P,4,4
#endif
___

{   my  %opcode = (