// ----------------------- //
func LeadingZeros(n uint) int {
- // amd64:"BSRQ"
+ // amd64/v1,amd64/v2:"BSRQ"
+ // amd64/v3:"LZCNTQ", -"BSRQ"
// s390x:"FLOGR"
// arm:"CLZ" arm64:"CLZ"
// mips:"CLZ"
+ // wasm:"I64Clz"
+ // ppc64x:"CNTLZD"
return bits.LeadingZeros(n)
}
func LeadingZeros64(n uint64) int {
- // amd64:"BSRQ"
+ // amd64/v1,amd64/v2:"BSRQ"
+ // amd64/v3:"LZCNTQ", -"BSRQ"
// s390x:"FLOGR"
// arm:"CLZ" arm64:"CLZ"
// mips:"CLZ"
+ // wasm:"I64Clz"
+ // ppc64x:"CNTLZD"
return bits.LeadingZeros64(n)
}
func LeadingZeros32(n uint32) int {
- // amd64:"BSRQ"
+ // amd64/v1,amd64/v2:"BSRQ","LEAQ",-"CMOVQEQ"
+ // amd64/v3: "LZCNTL",- "BSRL"
// s390x:"FLOGR"
- // arm:"CLZ" arm64:"CLZ"
+ // arm:"CLZ" arm64:"CLZW"
// mips:"CLZ"
+ // wasm:"I64Clz"
+ // ppc64x:"CNTLZW"
return bits.LeadingZeros32(n)
}
func LeadingZeros16(n uint16) int {
- // amd64:"BSRQ"
+ // amd64/v1,amd64/v2:"BSRL","LEAL",-"CMOVQEQ"
+ // amd64/v3: "LZCNTL",- "BSRL"
// s390x:"FLOGR"
// arm:"CLZ" arm64:"CLZ"
// mips:"CLZ"
+ // wasm:"I64Clz"
+ // ppc64x:"CNTLZD"
return bits.LeadingZeros16(n)
}
func LeadingZeros8(n uint8) int {
- // amd64 LeadingZeros8 not intrinsified (see ssa.go)
+ // amd64/v1,amd64/v2:"BSRL","LEAL",-"CMOVQEQ"
+ // amd64/v3: "LZCNTL",- "BSRL"
// s390x:"FLOGR"
// arm:"CLZ" arm64:"CLZ"
// mips:"CLZ"
+ // wasm:"I64Clz"
+ // ppc64x:"CNTLZD"
return bits.LeadingZeros8(n)
}
// --------------- //
func Len(n uint) int {
- // amd64:"BSRQ"
+ // amd64/v1,amd64/v2:"BSRQ"
+ // amd64/v3: "LZCNTQ"
// s390x:"FLOGR"
// arm:"CLZ" arm64:"CLZ"
// mips:"CLZ"
+ // wasm:"I64Clz"
+ // ppc64x:"SUBC","CNTLZD"
return bits.Len(n)
}
func Len64(n uint64) int {
- // amd64:"BSRQ"
+ // amd64/v1,amd64/v2:"BSRQ"
+ // amd64/v3: "LZCNTQ"
// s390x:"FLOGR"
// arm:"CLZ" arm64:"CLZ"
// mips:"CLZ"
+ // wasm:"I64Clz"
+ // ppc64x:"SUBC","CNTLZD"
return bits.Len64(n)
}
+func SubFromLen64(n uint64) int {
+ // ppc64x:"CNTLZD",-"SUBC"
+ return 64 - bits.Len64(n)
+}
+
func Len32(n uint32) int {
- // amd64:"BSRQ"
+ // amd64/v1,amd64/v2:"BSRQ","LEAQ",-"CMOVQEQ"
+ // amd64/v3: "LZCNTL"
// s390x:"FLOGR"
// arm:"CLZ" arm64:"CLZ"
// mips:"CLZ"
+ // wasm:"I64Clz"
+ // ppc64x: "CNTLZW"
return bits.Len32(n)
}
func Len16(n uint16) int {
- // amd64:"BSRQ"
+ // amd64/v1,amd64/v2:"BSRL","LEAL",-"CMOVQEQ"
+ // amd64/v3: "LZCNTL"
// s390x:"FLOGR"
// arm:"CLZ" arm64:"CLZ"
// mips:"CLZ"
+ // wasm:"I64Clz"
+ // ppc64x:"SUBC","CNTLZD"
return bits.Len16(n)
}
func Len8(n uint8) int {
- // amd64 Len8 not intrisified (see ssa.go)
+ // amd64/v1,amd64/v2:"BSRL","LEAL",-"CMOVQEQ"
+ // amd64/v3: "LZCNTL"
// s390x:"FLOGR"
// arm:"CLZ" arm64:"CLZ"
// mips:"CLZ"
+ // wasm:"I64Clz"
+ // ppc64x:"SUBC","CNTLZD"
return bits.Len8(n)
}
// bits.OnesCount //
// -------------------- //
+// TODO(register args) Restore a m d 6 4 / v 1 :.*x86HasPOPCNT when only one ABI is tested.
func OnesCount(n uint) int {
- // amd64:"POPCNTQ",".*support_popcnt"
+ // amd64/v2:-".*x86HasPOPCNT" amd64/v3:-".*x86HasPOPCNT"
+ // amd64:"POPCNTQ"
// arm64:"VCNT","VUADDLV"
+ // s390x:"POPCNT"
+ // ppc64x:"POPCNTD"
+ // wasm:"I64Popcnt"
return bits.OnesCount(n)
}
func OnesCount64(n uint64) int {
- // amd64:"POPCNTQ",".*support_popcnt"
+ // amd64/v2:-".*x86HasPOPCNT" amd64/v3:-".*x86HasPOPCNT"
+ // amd64:"POPCNTQ"
// arm64:"VCNT","VUADDLV"
+ // s390x:"POPCNT"
+ // ppc64x:"POPCNTD"
+ // wasm:"I64Popcnt"
return bits.OnesCount64(n)
}
func OnesCount32(n uint32) int {
- // amd64:"POPCNTL",".*support_popcnt"
+ // amd64/v2:-".*x86HasPOPCNT" amd64/v3:-".*x86HasPOPCNT"
+ // amd64:"POPCNTL"
// arm64:"VCNT","VUADDLV"
+ // s390x:"POPCNT"
+ // ppc64x:"POPCNTW"
+ // wasm:"I64Popcnt"
return bits.OnesCount32(n)
}
func OnesCount16(n uint16) int {
- // amd64:"POPCNTL",".*support_popcnt"
+ // amd64/v2:-".*x86HasPOPCNT" amd64/v3:-".*x86HasPOPCNT"
+ // amd64:"POPCNTL"
// arm64:"VCNT","VUADDLV"
+ // s390x:"POPCNT"
+ // ppc64x:"POPCNTW"
+ // wasm:"I64Popcnt"
return bits.OnesCount16(n)
}
+func OnesCount8(n uint8) int {
+ // s390x:"POPCNT"
+ // ppc64x:"POPCNTB"
+ // wasm:"I64Popcnt"
+ return bits.OnesCount8(n)
+}
+
// ----------------------- //
// bits.ReverseBytes //
// ----------------------- //
func ReverseBytes(n uint) uint {
// amd64:"BSWAPQ"
+ // 386:"BSWAPL"
// s390x:"MOVDBR"
// arm64:"REV"
return bits.ReverseBytes(n)
func ReverseBytes64(n uint64) uint64 {
// amd64:"BSWAPQ"
+ // 386:"BSWAPL"
// s390x:"MOVDBR"
// arm64:"REV"
+ // ppc64x/power10: "BRD"
return bits.ReverseBytes64(n)
}
func ReverseBytes32(n uint32) uint32 {
// amd64:"BSWAPL"
+ // 386:"BSWAPL"
// s390x:"MOVWBR"
// arm64:"REVW"
+ // ppc64x/power10: "BRW"
return bits.ReverseBytes32(n)
}
func ReverseBytes16(n uint16) uint16 {
// amd64:"ROLW"
+ // arm64:"REV16W",-"UBFX",-"ORR"
+ // arm/5:"SLL","SRL","ORR"
+ // arm/6:"REV16"
+ // arm/7:"REV16"
+ // ppc64x/power10: "BRH"
return bits.ReverseBytes16(n)
}
func RotateLeft64(n uint64) uint64 {
// amd64:"ROLQ"
// arm64:"ROR"
- // ppc64:"ROTL"
+ // ppc64x:"ROTL"
+ // s390x:"RISBGZ\t[$]0, [$]63, [$]37, "
+ // wasm:"I64Rotl"
return bits.RotateLeft64(n, 37)
}
func RotateLeft32(n uint32) uint32 {
// amd64:"ROLL" 386:"ROLL"
+ // arm:`MOVW\tR[0-9]+@>23`
// arm64:"RORW"
- // ppc64:"ROTLW"
+ // ppc64x:"ROTLW"
+ // s390x:"RLL"
+ // wasm:"I32Rotl"
return bits.RotateLeft32(n, 9)
}
-func RotateLeft16(n uint16) uint16 {
+func RotateLeft16(n uint16, s int) uint16 {
// amd64:"ROLW" 386:"ROLW"
- return bits.RotateLeft16(n, 5)
+ // arm64:"RORW",-"CSEL"
+ return bits.RotateLeft16(n, s)
}
-func RotateLeft8(n uint8) uint8 {
+func RotateLeft8(n uint8, s int) uint8 {
// amd64:"ROLB" 386:"ROLB"
- return bits.RotateLeft8(n, 5)
+ // arm64:"LSL","LSR",-"CSEL"
+ return bits.RotateLeft8(n, s)
+}
+
+func RotateLeftVariable(n uint, m int) uint {
+ // amd64:"ROLQ"
+ // arm64:"ROR"
+ // ppc64x:"ROTL"
+ // s390x:"RLLG"
+ // wasm:"I64Rotl"
+ return bits.RotateLeft(n, m)
+}
+
+func RotateLeftVariable64(n uint64, m int) uint64 {
+ // amd64:"ROLQ"
+ // arm64:"ROR"
+ // ppc64x:"ROTL"
+ // s390x:"RLLG"
+ // wasm:"I64Rotl"
+ return bits.RotateLeft64(n, m)
+}
+
+func RotateLeftVariable32(n uint32, m int) uint32 {
+ // arm:`MOVW\tR[0-9]+@>R[0-9]+`
+ // amd64:"ROLL"
+ // arm64:"RORW"
+ // ppc64x:"ROTLW"
+ // s390x:"RLL"
+ // wasm:"I32Rotl"
+ return bits.RotateLeft32(n, m)
}
// ------------------------ //
// ------------------------ //
func TrailingZeros(n uint) int {
- // amd64:"BSFQ","MOVL\t\\$64","CMOVQEQ"
+ // amd64/v1,amd64/v2:"BSFQ","MOVL\t\\$64","CMOVQEQ"
+ // amd64/v3:"TZCNTQ"
+ // 386:"BSFL"
+ // arm:"CLZ"
+ // arm64:"RBIT","CLZ"
// s390x:"FLOGR"
+ // ppc64x/power8:"ANDN","POPCNTD"
+ // ppc64x/power9: "CNTTZD"
+ // wasm:"I64Ctz"
return bits.TrailingZeros(n)
}
func TrailingZeros64(n uint64) int {
- // amd64:"BSFQ","MOVL\t\\$64","CMOVQEQ"
+ // amd64/v1,amd64/v2:"BSFQ","MOVL\t\\$64","CMOVQEQ"
+ // amd64/v3:"TZCNTQ"
+ // 386:"BSFL"
+ // arm64:"RBIT","CLZ"
// s390x:"FLOGR"
+ // ppc64x/power8:"ANDN","POPCNTD"
+ // ppc64x/power9: "CNTTZD"
+ // wasm:"I64Ctz"
return bits.TrailingZeros64(n)
}
+func TrailingZeros64Subtract(n uint64) int {
+ // ppc64x/power8:"NEG","SUBC","ANDN","POPCNTD"
+ // ppc64x/power9:"SUBC","CNTTZD"
+ return bits.TrailingZeros64(1 - n)
+}
+
func TrailingZeros32(n uint32) int {
- // amd64:"BTSQ\\t\\$32","BSFQ"
+ // amd64/v1,amd64/v2:"BTSQ\\t\\$32","BSFQ"
+ // amd64/v3:"TZCNTL"
+ // 386:"BSFL"
+ // arm:"CLZ"
+ // arm64:"RBITW","CLZW"
// s390x:"FLOGR","MOVWZ"
+ // ppc64x/power8:"ANDN","POPCNTW"
+ // ppc64x/power9: "CNTTZW"
+ // wasm:"I64Ctz"
return bits.TrailingZeros32(n)
}
func TrailingZeros16(n uint16) int {
- // amd64:"BSFQ","BTSQ\\t\\$16"
+ // amd64:"BSFL","ORL\\t\\$65536"
+ // 386:"BSFL\t"
+ // arm:"ORR\t\\$65536","CLZ",-"MOVHU\tR"
+ // arm64:"ORR\t\\$65536","RBITW","CLZW",-"MOVHU\tR",-"RBIT\t",-"CLZ\t"
// s390x:"FLOGR","OR\t\\$65536"
+ // ppc64x/power8:"POPCNTD","ORIS\\t\\$1"
+ // ppc64x/power9:"CNTTZD","ORIS\\t\\$1"
+ // wasm:"I64Ctz"
return bits.TrailingZeros16(n)
}
func TrailingZeros8(n uint8) int {
- // amd64:"BSFQ","BTSQ\\t\\$8"
+ // amd64:"BSFL","ORL\\t\\$256"
+ // 386:"BSFL"
+ // arm:"ORR\t\\$256","CLZ",-"MOVBU\tR"
+ // arm64:"ORR\t\\$256","RBITW","CLZW",-"MOVBU\tR",-"RBIT\t",-"CLZ\t"
// s390x:"FLOGR","OR\t\\$256"
+ // wasm:"I64Ctz"
return bits.TrailingZeros8(n)
}
+
+// IterateBitsNN checks special handling of TrailingZerosNN when the input is known to be non-zero.
+
+func IterateBits(n uint) int {
+ i := 0
+ for n != 0 {
+ // amd64/v1,amd64/v2:"BSFQ",-"CMOVEQ"
+ // amd64/v3:"TZCNTQ"
+ i += bits.TrailingZeros(n)
+ n &= n - 1
+ }
+ return i
+}
+
+func IterateBits64(n uint64) int {
+ i := 0
+ for n != 0 {
+ // amd64/v1,amd64/v2:"BSFQ",-"CMOVEQ"
+ // amd64/v3:"TZCNTQ"
+ i += bits.TrailingZeros64(n)
+ n &= n - 1
+ }
+ return i
+}
+
+func IterateBits32(n uint32) int {
+ i := 0
+ for n != 0 {
+ // amd64/v1,amd64/v2:"BSFL",-"BTSQ"
+ // amd64/v3:"TZCNTL"
+ i += bits.TrailingZeros32(n)
+ n &= n - 1
+ }
+ return i
+}
+
+func IterateBits16(n uint16) int {
+ i := 0
+ for n != 0 {
+ // amd64/v1,amd64/v2:"BSFL",-"BTSL"
+ // amd64/v3:"TZCNTL"
+ // arm64:"RBITW","CLZW",-"ORR"
+ i += bits.TrailingZeros16(n)
+ n &= n - 1
+ }
+ return i
+}
+
+func IterateBits8(n uint8) int {
+ i := 0
+ for n != 0 {
+ // amd64/v1,amd64/v2:"BSFL",-"BTSL"
+ // amd64/v3:"TZCNTL"
+ // arm64:"RBITW","CLZW",-"ORR"
+ i += bits.TrailingZeros8(n)
+ n &= n - 1
+ }
+ return i
+}
+
+// --------------- //
+// bits.Add* //
+// --------------- //
+
+func Add(x, y, ci uint) (r, co uint) {
+ // arm64:"ADDS","ADCS","ADC",-"ADD\t",-"CMP"
+ // amd64:"NEGL","ADCQ","SBBQ","NEGQ"
+ // ppc64x: "ADDC", "ADDE", "ADDZE"
+ // s390x:"ADDE","ADDC\t[$]-1,"
+ // riscv64: "ADD","SLTU"
+ return bits.Add(x, y, ci)
+}
+
+func AddC(x, ci uint) (r, co uint) {
+ // arm64:"ADDS","ADCS","ADC",-"ADD\t",-"CMP"
+ // amd64:"NEGL","ADCQ","SBBQ","NEGQ"
+ // loong64: "ADDV", "SGTU"
+ // ppc64x: "ADDC", "ADDE", "ADDZE"
+ // s390x:"ADDE","ADDC\t[$]-1,"
+ // mips64:"ADDV","SGTU"
+ // riscv64: "ADD","SLTU"
+ return bits.Add(x, 7, ci)
+}
+
+func AddZ(x, y uint) (r, co uint) {
+ // arm64:"ADDS","ADC",-"ADCS",-"ADD\t",-"CMP"
+ // amd64:"ADDQ","SBBQ","NEGQ",-"NEGL",-"ADCQ"
+ // loong64: "ADDV", "SGTU"
+ // ppc64x: "ADDC", -"ADDE", "ADDZE"
+ // s390x:"ADDC",-"ADDC\t[$]-1,"
+ // mips64:"ADDV","SGTU"
+ // riscv64: "ADD","SLTU"
+ return bits.Add(x, y, 0)
+}
+
+func AddR(x, y, ci uint) uint {
+ // arm64:"ADDS","ADCS",-"ADD\t",-"CMP"
+ // amd64:"NEGL","ADCQ",-"SBBQ",-"NEGQ"
+ // loong64: "ADDV", -"SGTU"
+ // ppc64x: "ADDC", "ADDE", -"ADDZE"
+ // s390x:"ADDE","ADDC\t[$]-1,"
+ // mips64:"ADDV",-"SGTU"
+ // riscv64: "ADD",-"SLTU"
+ r, _ := bits.Add(x, y, ci)
+ return r
+}
+
+func AddM(p, q, r *[3]uint) {
+ var c uint
+ r[0], c = bits.Add(p[0], q[0], c)
+ // arm64:"ADCS",-"ADD\t",-"CMP"
+ // amd64:"ADCQ",-"NEGL",-"SBBQ",-"NEGQ"
+ // s390x:"ADDE",-"ADDC\t[$]-1,"
+ r[1], c = bits.Add(p[1], q[1], c)
+ r[2], c = bits.Add(p[2], q[2], c)
+}
+
+func Add64(x, y, ci uint64) (r, co uint64) {
+ // arm64:"ADDS","ADCS","ADC",-"ADD\t",-"CMP"
+ // amd64:"NEGL","ADCQ","SBBQ","NEGQ"
+ // loong64: "ADDV", "SGTU"
+ // ppc64x: "ADDC", "ADDE", "ADDZE"
+ // s390x:"ADDE","ADDC\t[$]-1,"
+ // mips64:"ADDV","SGTU"
+ // riscv64: "ADD","SLTU"
+ return bits.Add64(x, y, ci)
+}
+
+func Add64C(x, ci uint64) (r, co uint64) {
+ // arm64:"ADDS","ADCS","ADC",-"ADD\t",-"CMP"
+ // amd64:"NEGL","ADCQ","SBBQ","NEGQ"
+ // loong64: "ADDV", "SGTU"
+ // ppc64x: "ADDC", "ADDE", "ADDZE"
+ // s390x:"ADDE","ADDC\t[$]-1,"
+ // mips64:"ADDV","SGTU"
+ // riscv64: "ADD","SLTU"
+ return bits.Add64(x, 7, ci)
+}
+
+func Add64Z(x, y uint64) (r, co uint64) {
+ // arm64:"ADDS","ADC",-"ADCS",-"ADD\t",-"CMP"
+ // amd64:"ADDQ","SBBQ","NEGQ",-"NEGL",-"ADCQ"
+ // loong64: "ADDV", "SGTU"
+ // ppc64x: "ADDC", -"ADDE", "ADDZE"
+ // s390x:"ADDC",-"ADDC\t[$]-1,"
+ // mips64:"ADDV","SGTU"
+ // riscv64: "ADD","SLTU"
+ return bits.Add64(x, y, 0)
+}
+
+func Add64R(x, y, ci uint64) uint64 {
+ // arm64:"ADDS","ADCS",-"ADD\t",-"CMP"
+ // amd64:"NEGL","ADCQ",-"SBBQ",-"NEGQ"
+ // loong64: "ADDV", -"SGTU"
+ // ppc64x: "ADDC", "ADDE", -"ADDZE"
+ // s390x:"ADDE","ADDC\t[$]-1,"
+ // mips64:"ADDV",-"SGTU"
+ // riscv64: "ADD",-"SLTU"
+ r, _ := bits.Add64(x, y, ci)
+ return r
+}
+func Add64M(p, q, r *[3]uint64) {
+ var c uint64
+ r[0], c = bits.Add64(p[0], q[0], c)
+ // arm64:"ADCS",-"ADD\t",-"CMP"
+ // amd64:"ADCQ",-"NEGL",-"SBBQ",-"NEGQ"
+ // ppc64x: -"ADDC", "ADDE", -"ADDZE"
+ // s390x:"ADDE",-"ADDC\t[$]-1,"
+ r[1], c = bits.Add64(p[1], q[1], c)
+ r[2], c = bits.Add64(p[2], q[2], c)
+}
+
+func Add64MSaveC(p, q, r, c *[2]uint64) {
+ // ppc64x: "ADDC\tR", "ADDZE"
+ r[0], c[0] = bits.Add64(p[0], q[0], 0)
+ // ppc64x: "ADDC\t[$]-1", "ADDE", "ADDZE"
+ r[1], c[1] = bits.Add64(p[1], q[1], c[0])
+}
+
+func Add64PanicOnOverflowEQ(a, b uint64) uint64 {
+ r, c := bits.Add64(a, b, 0)
+ // s390x:"BRC\t[$]3,",-"ADDE"
+ if c == 1 {
+ panic("overflow")
+ }
+ return r
+}
+
+func Add64PanicOnOverflowNE(a, b uint64) uint64 {
+ r, c := bits.Add64(a, b, 0)
+ // s390x:"BRC\t[$]3,",-"ADDE"
+ if c != 0 {
+ panic("overflow")
+ }
+ return r
+}
+
+func Add64PanicOnOverflowGT(a, b uint64) uint64 {
+ r, c := bits.Add64(a, b, 0)
+ // s390x:"BRC\t[$]3,",-"ADDE"
+ if c > 0 {
+ panic("overflow")
+ }
+ return r
+}
+
+func Add64MPanicOnOverflowEQ(a, b [2]uint64) [2]uint64 {
+ var r [2]uint64
+ var c uint64
+ r[0], c = bits.Add64(a[0], b[0], c)
+ r[1], c = bits.Add64(a[1], b[1], c)
+ // s390x:"BRC\t[$]3,"
+ if c == 1 {
+ panic("overflow")
+ }
+ return r
+}
+
+func Add64MPanicOnOverflowNE(a, b [2]uint64) [2]uint64 {
+ var r [2]uint64
+ var c uint64
+ r[0], c = bits.Add64(a[0], b[0], c)
+ r[1], c = bits.Add64(a[1], b[1], c)
+ // s390x:"BRC\t[$]3,"
+ if c != 0 {
+ panic("overflow")
+ }
+ return r
+}
+
+func Add64MPanicOnOverflowGT(a, b [2]uint64) [2]uint64 {
+ var r [2]uint64
+ var c uint64
+ r[0], c = bits.Add64(a[0], b[0], c)
+ r[1], c = bits.Add64(a[1], b[1], c)
+ // s390x:"BRC\t[$]3,"
+ if c > 0 {
+ panic("overflow")
+ }
+ return r
+}
+
+// Verify independent carry chain operations are scheduled efficiently
+// and do not cause unnecessary save/restore of the CA bit.
+//
+// This is an example of why CarryChainTail priority must be lower
+// (earlier in the block) than Memory. f[0]=f1 could be scheduled
+// after the first two lower 64 bit limb adds, but before either
+// high 64 bit limbs are added.
+//
+// This is what happened on PPC64 when compiling
+// crypto/internal/edwards25519/field.feMulGeneric.
+func Add64MultipleChains(a, b, c, d [2]uint64) {
+ var cx, d1, d2 uint64
+ a1, a2 := a[0], a[1]
+ b1, b2 := b[0], b[1]
+ c1, c2 := c[0], c[1]
+
+ // ppc64x: "ADDC\tR\\d+,", -"ADDE", -"MOVD\tXER"
+ d1, cx = bits.Add64(a1, b1, 0)
+ // ppc64x: "ADDE", -"ADDC", -"MOVD\t.*, XER"
+ d2, _ = bits.Add64(a2, b2, cx)
+
+ // ppc64x: "ADDC\tR\\d+,", -"ADDE", -"MOVD\tXER"
+ d1, cx = bits.Add64(c1, d1, 0)
+ // ppc64x: "ADDE", -"ADDC", -"MOVD\t.*, XER"
+ d2, _ = bits.Add64(c2, d2, cx)
+ d[0] = d1
+ d[1] = d2
+}
+
+// --------------- //
+// bits.Sub* //
+// --------------- //
+
+func Sub(x, y, ci uint) (r, co uint) {
+ // amd64:"NEGL","SBBQ","NEGQ"
+ // arm64:"NEGS","SBCS","NGC","NEG",-"ADD",-"SUB",-"CMP"
+ // loong64:"SUBV","SGTU"
+ // ppc64x:"SUBC", "SUBE", "SUBZE", "NEG"
+ // s390x:"SUBE"
+ // mips64:"SUBV","SGTU"
+ // riscv64: "SUB","SLTU"
+ return bits.Sub(x, y, ci)
+}
+
+func SubC(x, ci uint) (r, co uint) {
+ // amd64:"NEGL","SBBQ","NEGQ"
+ // arm64:"NEGS","SBCS","NGC","NEG",-"ADD",-"SUB",-"CMP"
+ // loong64:"SUBV","SGTU"
+ // ppc64x:"SUBC", "SUBE", "SUBZE", "NEG"
+ // s390x:"SUBE"
+ // mips64:"SUBV","SGTU"
+ // riscv64: "SUB","SLTU"
+ return bits.Sub(x, 7, ci)
+}
+
+func SubZ(x, y uint) (r, co uint) {
+ // amd64:"SUBQ","SBBQ","NEGQ",-"NEGL"
+ // arm64:"SUBS","NGC","NEG",-"SBCS",-"ADD",-"SUB\t",-"CMP"
+ // loong64:"SUBV","SGTU"
+ // ppc64x:"SUBC", -"SUBE", "SUBZE", "NEG"
+ // s390x:"SUBC"
+ // mips64:"SUBV","SGTU"
+ // riscv64: "SUB","SLTU"
+ return bits.Sub(x, y, 0)
+}
+
+func SubR(x, y, ci uint) uint {
+ // amd64:"NEGL","SBBQ",-"NEGQ"
+ // arm64:"NEGS","SBCS",-"NGC",-"NEG\t",-"ADD",-"SUB",-"CMP"
+ // loong64:"SUBV",-"SGTU"
+ // ppc64x:"SUBC", "SUBE", -"SUBZE", -"NEG"
+ // s390x:"SUBE"
+ // riscv64: "SUB",-"SLTU"
+ r, _ := bits.Sub(x, y, ci)
+ return r
+}
+func SubM(p, q, r *[3]uint) {
+ var c uint
+ r[0], c = bits.Sub(p[0], q[0], c)
+ // amd64:"SBBQ",-"NEGL",-"NEGQ"
+ // arm64:"SBCS",-"NEGS",-"NGC",-"NEG",-"ADD",-"SUB",-"CMP"
+ // ppc64x:-"SUBC", "SUBE", -"SUBZE", -"NEG"
+ // s390x:"SUBE"
+ r[1], c = bits.Sub(p[1], q[1], c)
+ r[2], c = bits.Sub(p[2], q[2], c)
+}
+
+func Sub64(x, y, ci uint64) (r, co uint64) {
+ // amd64:"NEGL","SBBQ","NEGQ"
+ // arm64:"NEGS","SBCS","NGC","NEG",-"ADD",-"SUB",-"CMP"
+ // loong64:"SUBV","SGTU"
+ // ppc64x:"SUBC", "SUBE", "SUBZE", "NEG"
+ // s390x:"SUBE"
+ // mips64:"SUBV","SGTU"
+ // riscv64: "SUB","SLTU"
+ return bits.Sub64(x, y, ci)
+}
+
+func Sub64C(x, ci uint64) (r, co uint64) {
+ // amd64:"NEGL","SBBQ","NEGQ"
+ // arm64:"NEGS","SBCS","NGC","NEG",-"ADD",-"SUB",-"CMP"
+ // loong64:"SUBV","SGTU"
+ // ppc64x:"SUBC", "SUBE", "SUBZE", "NEG"
+ // s390x:"SUBE"
+ // mips64:"SUBV","SGTU"
+ // riscv64: "SUB","SLTU"
+ return bits.Sub64(x, 7, ci)
+}
+
+func Sub64Z(x, y uint64) (r, co uint64) {
+ // amd64:"SUBQ","SBBQ","NEGQ",-"NEGL"
+ // arm64:"SUBS","NGC","NEG",-"SBCS",-"ADD",-"SUB\t",-"CMP"
+ // loong64:"SUBV","SGTU"
+ // ppc64x:"SUBC", -"SUBE", "SUBZE", "NEG"
+ // s390x:"SUBC"
+ // mips64:"SUBV","SGTU"
+ // riscv64: "SUB","SLTU"
+ return bits.Sub64(x, y, 0)
+}
+
+func Sub64R(x, y, ci uint64) uint64 {
+ // amd64:"NEGL","SBBQ",-"NEGQ"
+ // arm64:"NEGS","SBCS",-"NGC",-"NEG\t",-"ADD",-"SUB",-"CMP"
+ // loong64:"SUBV",-"SGTU"
+ // ppc64x:"SUBC", "SUBE", -"SUBZE", -"NEG"
+ // s390x:"SUBE"
+ // riscv64: "SUB",-"SLTU"
+ r, _ := bits.Sub64(x, y, ci)
+ return r
+}
+func Sub64M(p, q, r *[3]uint64) {
+ var c uint64
+ r[0], c = bits.Sub64(p[0], q[0], c)
+ // amd64:"SBBQ",-"NEGL",-"NEGQ"
+ // arm64:"SBCS",-"NEGS",-"NGC",-"NEG",-"ADD",-"SUB",-"CMP"
+ // s390x:"SUBE"
+ r[1], c = bits.Sub64(p[1], q[1], c)
+ r[2], c = bits.Sub64(p[2], q[2], c)
+}
+
+func Sub64MSaveC(p, q, r, c *[2]uint64) {
+ // ppc64x:"SUBC\tR\\d+, R\\d+,", "SUBZE", "NEG"
+ r[0], c[0] = bits.Sub64(p[0], q[0], 0)
+ // ppc64x:"SUBC\tR\\d+, [$]0,", "SUBE", "SUBZE", "NEG"
+ r[1], c[1] = bits.Sub64(p[1], q[1], c[0])
+}
+
+func Sub64PanicOnOverflowEQ(a, b uint64) uint64 {
+ r, b := bits.Sub64(a, b, 0)
+ // s390x:"BRC\t[$]12,",-"ADDE",-"SUBE"
+ if b == 1 {
+ panic("overflow")
+ }
+ return r
+}
+
+func Sub64PanicOnOverflowNE(a, b uint64) uint64 {
+ r, b := bits.Sub64(a, b, 0)
+ // s390x:"BRC\t[$]12,",-"ADDE",-"SUBE"
+ if b != 0 {
+ panic("overflow")
+ }
+ return r
+}
+
+func Sub64PanicOnOverflowGT(a, b uint64) uint64 {
+ r, b := bits.Sub64(a, b, 0)
+ // s390x:"BRC\t[$]12,",-"ADDE",-"SUBE"
+ if b > 0 {
+ panic("overflow")
+ }
+ return r
+}
+
+func Sub64MPanicOnOverflowEQ(a, b [2]uint64) [2]uint64 {
+ var r [2]uint64
+ var c uint64
+ r[0], c = bits.Sub64(a[0], b[0], c)
+ r[1], c = bits.Sub64(a[1], b[1], c)
+ // s390x:"BRC\t[$]12,"
+ if c == 1 {
+ panic("overflow")
+ }
+ return r
+}
+
+func Sub64MPanicOnOverflowNE(a, b [2]uint64) [2]uint64 {
+ var r [2]uint64
+ var c uint64
+ r[0], c = bits.Sub64(a[0], b[0], c)
+ r[1], c = bits.Sub64(a[1], b[1], c)
+ // s390x:"BRC\t[$]12,"
+ if c != 0 {
+ panic("overflow")
+ }
+ return r
+}
+
+func Sub64MPanicOnOverflowGT(a, b [2]uint64) [2]uint64 {
+ var r [2]uint64
+ var c uint64
+ r[0], c = bits.Sub64(a[0], b[0], c)
+ r[1], c = bits.Sub64(a[1], b[1], c)
+ // s390x:"BRC\t[$]12,"
+ if c > 0 {
+ panic("overflow")
+ }
+ return r
+}
+
+// --------------- //
+// bits.Mul* //
+// --------------- //
+
+func Mul(x, y uint) (hi, lo uint) {
+ // amd64:"MULQ"
+ // arm64:"UMULH","MUL"
+ // ppc64x:"MULHDU","MULLD"
+ // s390x:"MLGR"
+ // mips64: "MULVU"
+ return bits.Mul(x, y)
+}
+
+func Mul64(x, y uint64) (hi, lo uint64) {
+ // amd64:"MULQ"
+ // arm64:"UMULH","MUL"
+ // ppc64x:"MULHDU","MULLD"
+ // s390x:"MLGR"
+ // mips64: "MULVU"
+ // riscv64:"MULHU","MUL"
+ return bits.Mul64(x, y)
+}
+
+func Mul64HiOnly(x, y uint64) uint64 {
+ // arm64:"UMULH",-"MUL"
+ // riscv64:"MULHU",-"MUL\t"
+ hi, _ := bits.Mul64(x, y)
+ return hi
+}
+
+func Mul64LoOnly(x, y uint64) uint64 {
+ // arm64:"MUL",-"UMULH"
+ // riscv64:"MUL\t",-"MULHU"
+ _, lo := bits.Mul64(x, y)
+ return lo
+}
+
+// --------------- //
+// bits.Div* //
+// --------------- //
+
+func Div(hi, lo, x uint) (q, r uint) {
+ // amd64:"DIVQ"
+ return bits.Div(hi, lo, x)
+}
+
+func Div32(hi, lo, x uint32) (q, r uint32) {
+ // arm64:"ORR","UDIV","MSUB",-"UREM"
+ return bits.Div32(hi, lo, x)
+}
+
+func Div64(hi, lo, x uint64) (q, r uint64) {
+ // amd64:"DIVQ"
+ return bits.Div64(hi, lo, x)
+}
+
+func Div64degenerate(x uint64) (q, r uint64) {
+ // amd64:-"DIVQ"
+ return bits.Div64(0, x, 5)
+}