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internal/sm2ec: change order for s390x

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Sun Yimin 2024-08-26 11:45:46 +08:00 committed by GitHub
parent 05f3bcb57c
commit ebe5413d1e
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1 changed files with 15 additions and 0 deletions
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15
internal/sm2ec/sm2p256_asm.go
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@ -15,6 +15,7 @@ import (
_ "embed"
"errors"
"math/bits"
"runtime"
"unsafe"
"golang.org/x/sys/cpu"
@ -384,8 +385,22 @@ var p256Precomputed *[43]p256AffineTable
//go:embed p256_asm_table.bin
var p256PrecomputedEmbed string
func leUint64(b []byte) uint64 {
_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
}
func init() {
p256PrecomputedPtr := (*unsafe.Pointer)(unsafe.Pointer(&p256PrecomputedEmbed))
if runtime.GOARCH == "s390x" {
var newTable [43 * 32 * 2 * 4]uint64
for i, x := range (*[43 * 32 * 2 * 4][8]byte)(*p256PrecomputedPtr) {
newTable[i] = leUint64(x[:])
}
newTablePtr := unsafe.Pointer(&newTable)
p256PrecomputedPtr = &newTablePtr
}
p256Precomputed = (*[43]p256AffineTable)(*p256PrecomputedPtr)
}