logos-storage/plonky2
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optimizations

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This commit is contained in:
Nicholas Ward 2023-02-27 15:24:46 -08:00
parent 97cb5c75b6
commit 29df451d9d
1 changed files with 4 additions and 8 deletions
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12
evm/src/cpu/kernel/asm/hash/sha2/main.asm
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@ -19,9 +19,7 @@ global sha2_pad:
// STEP 1: append 1
// insert 128 (= 1 << 7) at x[num_bytes+1]
// stack: num_bytes, retdest
PUSH 1
PUSH 7
SHL
PUSH 0x80
// stack: 128, num_bytes, retdest
DUP2
// stack: num_bytes, 128, num_bytes, retdest
@ -33,21 +31,19 @@ global sha2_pad:
DUP1
// stack: num_bytes, num_bytes, retdest
%add_const(8)
%div_const(64)
%shr_const(6)
%increment
// stack: num_blocks = (num_bytes+8)//64 + 1, num_bytes, retdest
// STEP 3: calculate length := num_bytes*8
SWAP1
// stack: num_bytes, num_blocks, retdest
PUSH 8
MUL
%mul_const(8)
// stack: length = num_bytes*8, num_blocks, retdest
// STEP 4: write length to x[num_blocks*64-7..num_blocks*64]
DUP2
// stack: num_blocks, length, num_blocks, retdest
PUSH 64
MUL
%mul_const(64)
// stack: last_addr = num_blocks*64, length, num_blocks, retdest
%sha2_write_length
// stack: num_blocks, retdest