# Cortex A8 core and in absolute terms ~870 cycles per input block
# [or 13.6 cycles per byte].
+# February 2011.
+#
+# Profiler-assisted and platform-specific optimization resulted in 10%
+# improvement on Cortex A8 core and 12.2 cycles per byte.
while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
open STDOUT,">$output";
add $e,$K,$e,ror#2 @ E+=K_xx_xx
ldr $t3,[$Xi,#2*4]
eor $t0,$t0,$t1
- eor $t2,$t2,$t3
+ eor $t2,$t2,$t3 @ 1 cycle stall
eor $t1,$c,$d @ F_xx_xx
mov $t0,$t0,ror#31
add $e,$e,$a,ror#27 @ E+=ROR(A,27)
eor $t0,$t0,$t2,ror#31
+ str $t0,[$Xi,#-4]!
$opt1 @ F_xx_xx
$opt2 @ F_xx_xx
add $e,$e,$t0 @ E+=X[i]
- str $t0,[$Xi,#-4]!
___
}
sub BODY_00_15 {
my ($a,$b,$c,$d,$e)=@_;
$code.=<<___;
+#if __ARM_ARCH__<7
ldrb $t1,[$inp,#2]
ldrb $t0,[$inp,#3]
ldrb $t2,[$inp,#1]
add $e,$K,$e,ror#2 @ E+=K_00_19
ldrb $t3,[$inp],#4
- add $e,$e,$a,ror#27 @ E+=ROR(A,27)
orr $t0,$t0,$t1,lsl#8
eor $t1,$c,$d @ F_xx_xx
orr $t0,$t0,$t2,lsl#16
+ add $e,$e,$a,ror#27 @ E+=ROR(A,27)
orr $t0,$t0,$t3,lsl#24
+#else
+ ldr $t0,[$inp],#4 @ handles unaligned
+ add $e,$K,$e,ror#2 @ E+=K_00_19
+ eor $t1,$c,$d @ F_xx_xx
+ add $e,$e,$a,ror#27 @ E+=ROR(A,27)
+#ifdef __ARMEL__
+ rev $t0,$t0 @ byte swap
+#endif
+#endif
and $t1,$b,$t1,ror#2
add $e,$e,$t0 @ E+=X[i]
eor $t1,$t1,$d,ror#2 @ F_00_19(B,C,D)
}
$code=<<___;
+#include "arm_arch.h"
+
.text
.global sha1_block_data_order
teq $inp,$len
bne .Lloop @ [+18], total 1307
+#if __ARM_ARCH__>=5
+ ldmia sp!,{r4-r12,pc}
+#else
ldmia sp!,{r4-r12,lr}
tst lr,#1
moveq pc,lr @ be binary compatible with V4, yet
bx lr @ interoperable with Thumb ISA:-)
+#endif
.align 2
.LK_00_19: .word 0x5a827999
.LK_20_39: .word 0x6ed9eba1