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Optimise read_exits #6

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Apr 8, 2024
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Optimise read_exits #6

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40 changes: 12 additions & 28 deletions src/main.eas
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Original file line number Diff line number Diff line change
Expand Up @@ -255,41 +255,25 @@ accum_loop:
;;
;; (A[12:32] ++ B[0:12], B[12:32] ++ C[0:12], C[12:16])

;; Compute first element A[12:32] ++ B[0:12].
;; Shift addr bytes.
swap2 ;; [addr, pk[0:32], pk[32:48], record_offset, i, ..]
push 12*8 ;; [96, addr, pk[0:32], pk[32:48], record_offset, i, ..]
shl ;; [addr<<96, pk[0:32], pk[32:48], record_offset, i, ..]
dup2 ;; [pk[0:32], addr<<96, pk[0:32], pk[32:48], record_offset, i, ..]
push 20*8 ;; [160, pk[0:32], addr<<96, pk[0:32], pk[32:48], record_offset, i, ..]
shr ;; [pk[0:32]>>160, addr<<96, pk[0:32], pk[32:48], record_offset, i, ..]
or ;; [first, pk[0:32], pk[32:48], record_offset, i, ..]

;; Store first element at offset = i*RECORD_SIZE.
dup4 ;; [record_offset, first, pk[0:32], pk[32:48], record_offset, i, ..]

;; Store addr at offset = i*RECORD_SIZE.
dup4 ;; [record_offset, addr<<96, pk[0:32], pk[32:48], record_offset, i, ..]
mstore ;; [pk[0:32], pk[32:48], record_offset, i, ..]

;; Compute second element B[12:32] ++ C[0:12].
push 12*8 ;; [96, pk[0:32], pk[32:48], record_offset, i, ..]
shl ;; [pk[0:32]<<96, pk[32:48], record_offset, i, ..]
dup2 ;; [pk[32:48], pk[0:32]<<96, pk[32:48], record_offset, i, ..]
push 20*8 ;; [160, pk[32:48], pk[0:32]<<96, pk[32:48], record_offset, i, ..]
shr ;; [pk[32:48]>>160, pk[0:32]<<96, pk[32:48], record_offset, i, ..]
or ;; [second, pk[32:48], record_offset, i, ..]]

;; Store second element at offset = i*RECORD_SIZE + 32.
dup3 ;; [record_offset, second, pk[32:48], record_offset, i, ..]
push 32 ;; [32, record_offset, second, pk[32:48], record_offset, i, ..]
add ;; [record_offset+32, second, pk[32:48], record_offset, i, ..]
;; Store pk[0:32] at offset = i*RECORD_SIZE + 20.
dup3 ;; [record_offset, pk[0:32], pk[32:48], record_offset, i, ..]
push 20 ;; [20, record_offset, pk[0:32], pk[32:48], record_offset, i, ..]
add ;; [record_offset+20, pk[0:32], pk[32:48], record_offset, i, ..]
mstore ;; [pk[32:48], record_offset, i, ..]

;; Compute third element: C[12:16].
push 12*8 ;; [96, pk[32:48], record_offset, i, ..]
shl ;; [third, record_offset, i, ..]

;; Store third element at offset = i*RECORD_SIZE + 64.
swap1 ;; [record_offset, third, i, ..]
push 64 ;; [64, record_offset, third, i, ..]
add ;; [record_offset+64, third, i, ..]
;; Store pk[32:48] at offset = i*RECORD_SIZE + 52.
swap1 ;; [record_offset, pk[32:48], i, ..]
push 52 ;; [52, record_offset, pk[32:48], i, ..]
add ;; [record_offset+52, pk[32:48], i, ..]
mstore ;; [i, ..]

;; Increment i.
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