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internal/sm2ec: loong64 p256OrdReduce

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Sun Yimin 2025-10-14 10:35:17 +08:00 committed by GitHub
parent e56b96e4bb
commit a552743ef3
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2 changed files with 117 additions and 3 deletions
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88
internal/sm2ec/p256_asm_loong64.s
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@ -473,7 +473,7 @@ TEXT ·p256FromMont(SB),NOSPLIT,$0
// Final reduction
ADDV $1, acc0, acc4
SGTU acc0, acc4, t1
MOVV p256one<>+0X08(SB), t2
MOVV p256one<>+0x08(SB), t2
ADDV t2, t1, t1 // no carry
ADDV acc1, t1, acc5
SGTU acc1, acc5, t3
@ -793,7 +793,7 @@ TEXT sm2P256SqrInternal<>(SB),NOSPLIT,$0
// Final reduction
ADDV $1, y0, acc4
SGTU y0, acc4, t1
MOVV p256one<>+0X08(SB), t2
MOVV p256one<>+0x08(SB), t2
ADDV t2, t1, t1 // no carry
ADDV y1, t1, acc5
SGTU y1, acc5, t3
@ -1154,7 +1154,7 @@ TEXT sm2P256MulInternal<>(SB),NOSPLIT,$0
// Final reduction
ADDV $1, y0, acc4
SGTU y0, acc4, t1
MOVV p256one<>+0X08(SB), t2
MOVV p256one<>+0x08(SB), t2
ADDV t2, t1, t1 // no carry
ADDV y1, t1, acc5
SGTU y1, acc5, t3
@ -1209,3 +1209,85 @@ TEXT ·p256Mul(SB),NOSPLIT,$0
MOVV y3, (8*3)(res_ptr)
RET
/* ---------------------------------------*/
// func p256OrdSqr(res, in *p256OrdElement, n int)
TEXT ·p256OrdSqr(SB),NOSPLIT,$0
RET
/* ---------------------------------------*/
// func p256OrdMul(res, in1, in2 *p256OrdElement)
TEXT ·p256OrdMul(SB),NOSPLIT,$0
RET
/* ---------------------------------------*/
//func p256OrdReduce(s *p256OrdElement)
TEXT ·p256OrdReduce(SB),NOSPLIT,$0
MOVV s+0(FP), res_ptr
MOVV (8*0)(res_ptr), acc0
MOVV (8*1)(res_ptr), acc1
MOVV (8*2)(res_ptr), acc2
MOVV (8*3)(res_ptr), acc3
MOVV p256ord<>+0x00(SB), x0
MOVV p256ord<>+0x08(SB), x1
MOVV p256ord<>+0x10(SB), x2
MOVV p256ord<>+0x18(SB), x3
SGTU x0, acc0, t0
SUBV x0, acc0, y0
// SBCS x1, acc1
ADDV t0, x1, t1 // no carry
SGTU t1, acc1, t2
SUBV t1, acc1, y1
// SBCS x2, acc2
SGTU x2, acc2, t3
SUBV x2, acc2, y2
SGTU t2, y2, t4
SUBV t2, y2, y2
OR t3, t4, t2
// SBCS x3, acc3
SGTU x3, acc3, t3
SUBV x3, acc3, y3
SGTU t2, y3, t4
SUBV t2, y3, y3
OR t3, t4, t0
MASKNEZ t0, y0, y0
MASKEQZ t0, acc0, acc0
OR acc0, y0
MASKNEZ t0, y1, y1
MASKEQZ t0, acc1, acc1
OR acc1, y1
MASKNEZ t0, y2, y2
MASKEQZ t0, acc2, acc2
OR acc2, y2
MASKNEZ t0, y3, y3
MASKEQZ t0, acc3, acc3
OR acc3, y3
MOVV y0, (8*0)(res_ptr)
MOVV y1, (8*1)(res_ptr)
MOVV y2, (8*2)(res_ptr)
MOVV y3, (8*3)(res_ptr)
RET
/* ---------------------------------------*/
// func p256Select(res *SM2P256Point, table *p256Table, idx, limit int)
TEXT ·p256Select(SB),NOSPLIT,$0
RET
/* ---------------------------------------*/
// func p256SelectAffine(res *p256AffinePoint, table *p256AffineTable, idx int)
TEXT ·p256SelectAffine(SB),NOSPLIT,$0
RET
/* ---------------------------------------*/
// (x3, x2, x1, x0) = (y3, y2, y1, y0) - (x3, x2, x1, x0)
TEXT sm2P256Subinternal<>(SB),NOSPLIT,$0
RET

32
internal/sm2ec/sm2p256_asm_loong64_test.go
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@ -226,3 +226,35 @@ func TestFuzzyP256Sqr(t *testing.T) {
p256SqrTest(t, x, p, r)
}
}
func TestP256OrdReduce(t *testing.T) {
p256Ord := &p256OrdElement{0x53bbf40939d54123, 0x7203df6b21c6052b, 0xffffffffffffffff, 0xfffffffeffffffff}
// s < p256Ord
var s1 p256OrdElement
copy(s1[:], p256Ord[:])
s1[0] -= 1 // s1 = p256Ord - 1
s1Orig := s1
p256OrdReduce(&s1)
if s1 != s1Orig {
t.Errorf("p256OrdReduce changed s when s < p256Ord: got %x, want %x", s1, s1Orig)
}
// s >= p256Ord
var s2 p256OrdElement
copy(s2[:], p256Ord[:])
// s2 = p256Ord
p256OrdReduce(&s2)
zero := p256OrdElement{}
if s2 != zero {
t.Errorf("p256OrdReduce failed for s == p256Ord: got %x, want 0", s2)
}
// s2 = p256Ord + 1
copy(s2[:], p256Ord[:])
s2[0] += 1
p256OrdReduce(&s2)
one := p256OrdElement{1, 0, 0, 0}
if s2 != one {
t.Errorf("p256OrdReduce failed for s == p256Ord+1: got %x, want %x", s2, one)
}
}