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65816-crypto
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Save a couple values on the stack rather than looking them up again. 

This is cycle-neutral (assuming a page-aligned DP), but it reduces instruction bytes and therefore may give a speedup on accelerators with caches.
This commit is contained in:
Stephen Heumann 2017-06-26 21:11:19 -05:00
parent 301021e75e
commit 75aac0daa9
1 changed files with 13 additions and 13 deletions
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26
aes.macros
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@ -30,40 +30,40 @@
macro
MixColumn &i,&A,&B,&C,&D,&state,&out
ldy &state+&D
lda Sbox,Y
pha
ldx &state+&A
lda Xtime2Sbox,X
eor Xtime2Sbox,X
ldy &state+&B
eor Xtime3Sbox,Y
ldy &state+&D
eor Sbox,Y
ldy &state+&C
eor Sbox,Y
eor rk+&round*16+&i
sta &out+&i
lda Xtime3Sbox,Y
pla
eor Xtime3Sbox,Y
eor Sbox,X
ldy &state+&B
eor Xtime2Sbox,Y
ldy &state+&D
eor Sbox,Y
eor rk+&round*16+&i+1
sta &out+&i+1
lda Xtime3Sbox,Y
lda Sbox,Y
pha
ldy &state+&D
eor Xtime3Sbox,Y
eor Sbox,X
ldy &state+&B
eor Sbox,Y
ldy &state+&C
eor Xtime2Sbox,Y
eor rk+&round*16+&i+2
sta &out+&i+2
lda Sbox,Y
eor Xtime3Sbox,X
ldy &state+&B
pla
eor Sbox,Y
eor Xtime3Sbox,X
ldy &state+&D
eor Xtime2Sbox,Y
eor rk+&round*16+&i+3