ARMv8 assembly pack: add Cortex performance numbers.

[openssl.git] / crypto / sha / asm / sha512-armv8.pl

diff --git a/crypto/sha/asm/sha512-armv8.pl b/crypto/sha/asm/sha512-armv8.pl
index 6935ed6521569f01ff535c00f683810dba1b1ad6..bd7a0a5662e0a236f8f35dcdedd83954c9a7d1f8 100644 (file)
--- a/crypto/sha/asm/sha512-armv8.pl
+++ b/crypto/sha/asm/sha512-armv8.pl
@@ -14,12 +14,18 @@
 #
 #              SHA256-hw       SHA256(*)       SHA512
 # Apple A7     1.97            10.5 (+33%)     6.73 (-1%(**))
-# Cortex-A5x   n/a             n/a             n/a
+# Cortex-A53   2.38            15.6 (+110%)    10.1 (+190%(***))
+# Cortex-A57   2.31            11.6 (+86%)     7.51 (+260%(***))
 # 
 # (*)  Software SHA256 results are of lesser relevance, presented
 #      mostly for informational purposes.
 # (**) The result is a trade-off: it's possible to improve it by
-#      10%, but at the cost of 20% loss on Cortex-A5x.
+#      10% (or by 1 cycle per round), but at the cost of 20% loss
+#      on Cortex-A53 (or by 4 cycles per round).
+# (***)        Super-impressive coefficients over gcc-generated code are
+#      indication of some compiler "pathology", most notably code
+#      generated with -mgeneral-regs-only is significanty faster
+#      and lags behind assembly only by 50-90%.
 
 $flavour=shift;
 $output=shift;