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internal/sm2ec: fix s390x p256Select

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Sun Yimin 2024-08-26 14:52:48 +08:00 committed by GitHub
parent c26709d795
commit 94a4b08155
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1 changed files with 6 additions and 4 deletions
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10
internal/sm2ec/p256_asm_s390x.s
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@ -217,9 +217,10 @@ TEXT ·p256MovCond(SB), NOSPLIT, $0
// Constant time table access
// Indexed from 1 to 15, with -1 offset
// (index 0 is implicitly point at infinity)
// func p256Select(res *P256Point, table *p256Table, idx int)
// func p256Select(res *P256Point, table *p256Table, idx int, limit int)
#define P3ptr R1
#define P1ptr R2
#define LIMIT R3
#define COUNT R4
#define X1L V0
@ -242,6 +243,7 @@ TEXT ·p256MovCond(SB), NOSPLIT, $0
TEXT ·p256Select(SB), NOSPLIT, $0
MOVD res+0(FP), P3ptr
MOVD table+8(FP), P1ptr
MOVD limit+24(FP), LIMIT
VLREPB idx+(16+7)(FP), IDX
VREPIB $1, ONE
VREPIB $1, SEL2
@ -272,10 +274,9 @@ loop_select:
VSEL Z2H, Z1H, SEL1, Z1H
VAB SEL2, ONE, SEL2
ADDW $1, COUNT
ADD $96, P1ptr
CMPW COUNT, $17
BLT loop_select
ADD $1, COUNT
CMPBNE COUNT, LIMIT, loop_select
VST X1H, 0(P3ptr)
VST X1L, 16(P3ptr)
@ -288,6 +289,7 @@ loop_select:
#undef P3ptr
#undef P1ptr
#undef COUNT
#undef LIMIT
#undef X1L
#undef X1H
#undef Y1L