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Updated SM2 WWMM (2) (markdown)

Sun Yimin 2024-03-01 09:00:13 +08:00
parent 2ce60e917b
commit 11e7541842
1 changed files with 3 additions and 3 deletions
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SM2-WWMM-(2).md

@ -106,15 +106,15 @@ $t_0=t_0 - a_1$
MOVQ acc0, DX \
SHLQ $32, AX \ // AX = L(acc0 * 2^32), low part
SHRQ $32, DX \ // DX = H(acc0 * 2^32), high part
\// calculate the negative part: [0, -0x100000000, 0, -0x100000000] * acc0
\// calculate the negative part: [1, -0x100000000, 0, -0x100000000] * acc0
SUBQ AX, acc1 \
SBBQ DX, acc2 \
SBBQ AX, acc3 \
MOVQ acc0, AX \
SBBQ DX, acc0 \
\ // calculate the positive part: [1, 0, 0, 1] * acc0 + [0, acc3, acc2, acc1],
\ // calculate the positive part: [0, 0, 0, 1] * AX + [acc0, acc3, acc2, acc1],
\ // due to (-1) * acc0 + acc0 == 0, so last lowest lamb 0 is dropped directly, no carry.
ADDQ AX, acc1 \ // acc1' = L (acc0 + acc1)
ADDQ AX, acc1 \ // acc1' = L (AX+ acc1)
ADCQ $0, acc2 \ // acc2' = acc2 + carry1
ADCQ $0, acc3 \ // acc3' = acc3 + carry2
ADCQ $0, acc0 \ // acc0' = acc0 + carry3