* sparc/arcfour-crypt.asm: Improved instruction scheduling.

Rev: src/nettle/sparc/arcfour-crypt.asm:1.3

diff --git a/sparc/arcfour-crypt.asm b/sparc/arcfour-crypt.asm
index 9252a1a9b5511a9c21fb4af29c40e95e899c58d9..9cc19f7d53293a599cccfd5af0c3c601bdbd4f2c 100644 (file)
--- a/sparc/arcfour-crypt.asm
+++ b/sparc/arcfour-crypt.asm
@@ -60,19 +60,19 @@ PROLOGUE(nettle_arcfour_crypt)
        add     I, 1, I
        and     I, 0xff, I
        ldub    [CTX + I], SI
+       subcc   LENGTH,1,LENGTH
+       ldub    [SRC], TMP
        add     J, SI, J
        and     J, 0xff, J
        ldub    [CTX + J], SJ
-       stb     SJ, [CTX + I]
+       add     SRC, 1, SRC
        stb     SI, [CTX + J]
        add     SI, SJ, SI
        and     SI, 0xff, SI
        ldub    [CTX + SI], SI
-       ldub    [SRC], TMP
+       stb     SJ, [CTX + I]
        xor     TMP, SI, TMP
        stb     TMP, [DST]
-       subcc   LENGTH,1,LENGTH
-       add     SRC, 1, SRC
        bne     .Loop
        add     DST, 1, DST
 
@@ -91,7 +91,11 @@ C Some stats from adriana.lysator.liu.se (SS1000$, 85 MHz), for AES 128
 
 C 1:   nettle-1.13 C-code
 C 2:   First working version of the assembler code
-       
+C 3:   Moved load of source byte
+C 4:   Better instruction scheduling
+
 C      MB/s    cycles/byte     Code size (bytes)
 C 1:   6.6     12.4            132
 C 2:   5.6     14.5            116
+C 3:   6.0     13.5            116
+C 4:   6.5     12.4            116