1 files changed, 741 insertions, 0 deletions
diff --git a/test/codegen/mathbits.go b/test/codegen/mathbits.go
new file mode 100644
index 0000000..fff6639
--- /dev/null
+++ b/test/codegen/mathbits.go
@@ -0,0 +1,741 @@
+// asmcheck
+
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package codegen
+
+import "math/bits"
+
+// ----------------------- //
+//    bits.LeadingZeros    //
+// ----------------------- //
+
+func LeadingZeros(n uint) int {
+	// amd64:"BSRQ"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	return bits.LeadingZeros(n)
+}
+
+func LeadingZeros64(n uint64) int {
+	// amd64:"BSRQ"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	return bits.LeadingZeros64(n)
+}
+
+func LeadingZeros32(n uint32) int {
+	// amd64:"BSRQ","LEAQ",-"CMOVQEQ"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZW"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	return bits.LeadingZeros32(n)
+}
+
+func LeadingZeros16(n uint16) int {
+	// amd64:"BSRL","LEAL",-"CMOVQEQ"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	return bits.LeadingZeros16(n)
+}
+
+func LeadingZeros8(n uint8) int {
+	// amd64:"BSRL","LEAL",-"CMOVQEQ"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	return bits.LeadingZeros8(n)
+}
+
+// --------------- //
+//    bits.Len*    //
+// --------------- //
+
+func Len(n uint) int {
+	// amd64:"BSRQ"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	return bits.Len(n)
+}
+
+func Len64(n uint64) int {
+	// amd64:"BSRQ"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	// ppc64le:"SUBC","CNTLZD"
+	// ppc64:"SUBC","CNTLZD"
+	return bits.Len64(n)
+}
+
+func SubFromLen64(n uint64) int {
+	// ppc64le:"CNTLZD",-"SUBC"
+	// ppc64:"CNTLZD",-"SUBC"
+	return 64 - bits.Len64(n)
+}
+
+func Len32(n uint32) int {
+	// amd64:"BSRQ","LEAQ",-"CMOVQEQ"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	return bits.Len32(n)
+}
+
+func Len16(n uint16) int {
+	// amd64:"BSRL","LEAL",-"CMOVQEQ"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	return bits.Len16(n)
+}
+
+func Len8(n uint8) int {
+	// amd64:"BSRL","LEAL",-"CMOVQEQ"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	return bits.Len8(n)
+}
+
+// -------------------- //
+//    bits.OnesCount    //
+// -------------------- //
+
+// amd64:".*x86HasPOPCNT"
+func OnesCount(n uint) int {
+	// amd64:"POPCNTQ"
+	// arm64:"VCNT","VUADDLV"
+	// s390x:"POPCNT"
+	// ppc64:"POPCNTD"
+	// ppc64le:"POPCNTD"
+	// wasm:"I64Popcnt"
+	return bits.OnesCount(n)
+}
+
+// amd64:".*x86HasPOPCNT"
+func OnesCount64(n uint64) int {
+	// amd64:"POPCNTQ"
+	// arm64:"VCNT","VUADDLV"
+	// s390x:"POPCNT"
+	// ppc64:"POPCNTD"
+	// ppc64le:"POPCNTD"
+	// wasm:"I64Popcnt"
+	return bits.OnesCount64(n)
+}
+
+// amd64:".*x86HasPOPCNT"
+func OnesCount32(n uint32) int {
+	// amd64:"POPCNTL"
+	// arm64:"VCNT","VUADDLV"
+	// s390x:"POPCNT"
+	// ppc64:"POPCNTW"
+	// ppc64le:"POPCNTW"
+	// wasm:"I64Popcnt"
+	return bits.OnesCount32(n)
+}
+
+// amd64:".*x86HasPOPCNT"
+func OnesCount16(n uint16) int {
+	// amd64:"POPCNTL"
+	// arm64:"VCNT","VUADDLV"
+	// s390x:"POPCNT"
+	// ppc64:"POPCNTW"
+	// ppc64le:"POPCNTW"
+	// wasm:"I64Popcnt"
+	return bits.OnesCount16(n)
+}
+
+func OnesCount8(n uint8) int {
+	// s390x:"POPCNT"
+	// ppc64:"POPCNTB"
+	// ppc64le:"POPCNTB"
+	// wasm:"I64Popcnt"
+	return bits.OnesCount8(n)
+}
+
+// ----------------------- //
+//    bits.ReverseBytes    //
+// ----------------------- //
+
+func ReverseBytes(n uint) uint {
+	// amd64:"BSWAPQ"
+	// s390x:"MOVDBR"
+	// arm64:"REV"
+	return bits.ReverseBytes(n)
+}
+
+func ReverseBytes64(n uint64) uint64 {
+	// amd64:"BSWAPQ"
+	// s390x:"MOVDBR"
+	// arm64:"REV"
+	return bits.ReverseBytes64(n)
+}
+
+func ReverseBytes32(n uint32) uint32 {
+	// amd64:"BSWAPL"
+	// s390x:"MOVWBR"
+	// arm64:"REVW"
+	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"
+	return bits.ReverseBytes16(n)
+}
+
+// --------------------- //
+//    bits.RotateLeft    //
+// --------------------- //
+
+func RotateLeft64(n uint64) uint64 {
+	// amd64:"ROLQ"
+	// arm64:"ROR"
+	// ppc64:"ROTL"
+	// ppc64le:"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"
+	// ppc64le:"ROTLW"
+	// s390x:"RLL"
+	// wasm:"I32Rotl"
+	return bits.RotateLeft32(n, 9)
+}
+
+func RotateLeft16(n uint16) uint16 {
+	// amd64:"ROLW" 386:"ROLW"
+	return bits.RotateLeft16(n, 5)
+}
+
+func RotateLeft8(n uint8) uint8 {
+	// amd64:"ROLB" 386:"ROLB"
+	return bits.RotateLeft8(n, 5)
+}
+
+func RotateLeftVariable(n uint, m int) uint {
+	// amd64:"ROLQ"
+	// arm64:"ROR"
+	// ppc64:"ROTL"
+	// ppc64le:"ROTL"
+	// s390x:"RLLG"
+	// wasm:"I64Rotl"
+	return bits.RotateLeft(n, m)
+}
+
+func RotateLeftVariable64(n uint64, m int) uint64 {
+	// amd64:"ROLQ"
+	// arm64:"ROR"
+	// ppc64:"ROTL"
+	// ppc64le:"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"
+	// ppc64:"ROTLW"
+	// ppc64le:"ROTLW"
+	// s390x:"RLL"
+	// wasm:"I32Rotl"
+	return bits.RotateLeft32(n, m)
+}
+
+// ------------------------ //
+//    bits.TrailingZeros    //
+// ------------------------ //
+
+func TrailingZeros(n uint) int {
+	// amd64:"BSFQ","MOVL\t\\$64","CMOVQEQ"
+	// arm:"CLZ"
+	// arm64:"RBIT","CLZ"
+	// s390x:"FLOGR"
+	// ppc64/power8:"ANDN","POPCNTD"
+	// ppc64le/power8:"ANDN","POPCNTD"
+	// ppc64/power9: "CNTTZD"
+	// ppc64le/power9: "CNTTZD"
+	// wasm:"I64Ctz"
+	return bits.TrailingZeros(n)
+}
+
+func TrailingZeros64(n uint64) int {
+	// amd64:"BSFQ","MOVL\t\\$64","CMOVQEQ"
+	// arm64:"RBIT","CLZ"
+	// s390x:"FLOGR"
+	// ppc64/power8:"ANDN","POPCNTD"
+	// ppc64le/power8:"ANDN","POPCNTD"
+	// ppc64/power9: "CNTTZD"
+	// ppc64le/power9: "CNTTZD"
+	// wasm:"I64Ctz"
+	return bits.TrailingZeros64(n)
+}
+
+func TrailingZeros64Subtract(n uint64) int {
+	// ppc64le/power8:"NEG","SUBC","ANDN","POPCNTD"
+	// ppc64le/power9:"SUBC","CNTTZD"
+	return bits.TrailingZeros64(1 - n)
+}
+
+func TrailingZeros32(n uint32) int {
+	// amd64:"BTSQ\\t\\$32","BSFQ"
+	// arm:"CLZ"
+	// arm64:"RBITW","CLZW"
+	// s390x:"FLOGR","MOVWZ"
+	// ppc64/power8:"ANDN","POPCNTW"
+	// ppc64le/power8:"ANDN","POPCNTW"
+	// ppc64/power9: "CNTTZW"
+	// ppc64le/power9: "CNTTZW"
+	// wasm:"I64Ctz"
+	return bits.TrailingZeros32(n)
+}
+
+func TrailingZeros16(n uint16) int {
+	// amd64:"BSFL","BTSL\\t\\$16"
+	// 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"
+	// ppc64/power8:"POPCNTD","OR\\t\\$65536"
+	// ppc64le/power8:"POPCNTD","OR\\t\\$65536"
+	// ppc64/power9:"CNTTZD","OR\\t\\$65536"
+	// ppc64le/power9:"CNTTZD","OR\\t\\$65536"
+	// wasm:"I64Ctz"
+	return bits.TrailingZeros16(n)
+}
+
+func TrailingZeros8(n uint8) int {
+	// amd64:"BSFL","BTSL\\t\\$8"
+	// 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:"BSFQ",-"CMOVEQ"
+		i += bits.TrailingZeros(n)
+		n &= n - 1
+	}
+	return i
+}
+
+func IterateBits64(n uint64) int {
+	i := 0
+	for n != 0 {
+		// amd64:"BSFQ",-"CMOVEQ"
+		i += bits.TrailingZeros64(n)
+		n &= n - 1
+	}
+	return i
+}
+
+func IterateBits32(n uint32) int {
+	i := 0
+	for n != 0 {
+		// amd64:"BSFL",-"BTSQ"
+		i += bits.TrailingZeros32(n)
+		n &= n - 1
+	}
+	return i
+}
+
+func IterateBits16(n uint16) int {
+	i := 0
+	for n != 0 {
+		// amd64:"BSFL",-"BTSL"
+		// arm64:"RBITW","CLZW",-"ORR"
+		i += bits.TrailingZeros16(n)
+		n &= n - 1
+	}
+	return i
+}
+
+func IterateBits8(n uint8) int {
+	i := 0
+	for n != 0 {
+		// amd64:"BSFL",-"BTSL"
+		// 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"
+	// s390x:"ADDE","ADDC\t[$]-1,"
+	return bits.Add(x, y, ci)
+}
+
+func AddC(x, ci uint) (r, co uint) {
+	// arm64:"ADDS","ADCS","ADC",-"ADD\t",-"CMP"
+	// amd64:"NEGL","ADCQ","SBBQ","NEGQ"
+	// s390x:"ADDE","ADDC\t[$]-1,"
+	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"
+	// s390x:"ADDC",-"ADDC\t[$]-1,"
+	return bits.Add(x, y, 0)
+}
+
+func AddR(x, y, ci uint) uint {
+	// arm64:"ADDS","ADCS",-"ADD\t",-"CMP"
+	// amd64:"NEGL","ADCQ",-"SBBQ",-"NEGQ"
+	// s390x:"ADDE","ADDC\t[$]-1,"
+	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[$]-1,"
+	r[1], c = bits.Add(p[1], q[1], c)
+	r[2], c = bits.Add(p[2], q[2], c)
+}
+
+func Add64(x, y, ci uint64) (r, co uint64) {
+	// arm64:"ADDS","ADCS","ADC",-"ADD\t",-"CMP"
+	// amd64:"NEGL","ADCQ","SBBQ","NEGQ"
+	// ppc64: "ADDC", "ADDE", "ADDZE"
+	// ppc64le: "ADDC", "ADDE", "ADDZE"
+	// s390x:"ADDE","ADDC\t[$]-1,"
+	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"
+	// ppc64: "ADDC", "ADDE", "ADDZE"
+	// ppc64le: "ADDC", "ADDE", "ADDZE"
+	// s390x:"ADDE","ADDC\t[$]-1,"
+	return bits.Add64(x, 7, ci)
+}
+
+func Add64Z(x, y uint64) (r, co uint64) {
+	// arm64:"ADDS","ADC",-"ADCS",-"ADD\t",-"CMP"
+	// amd64:"ADDQ","SBBQ","NEGQ",-"NEGL",-"ADCQ"
+	// ppc64: "ADDC", "ADDE", "ADDZE"
+	// ppc64le: "ADDC", "ADDE", "ADDZE"
+	// s390x:"ADDC",-"ADDC\t[$]-1,"
+	return bits.Add64(x, y, 0)
+}
+
+func Add64R(x, y, ci uint64) uint64 {
+	// arm64:"ADDS","ADCS",-"ADD\t",-"CMP"
+	// amd64:"NEGL","ADCQ",-"SBBQ",-"NEGQ"
+	// ppc64: "ADDC", "ADDE", "ADDZE"
+	// ppc64le: "ADDC", "ADDE", "ADDZE"
+	// s390x:"ADDE","ADDC\t[$]-1,"
+	r, _ := bits.Add64(x, y, ci)
+	return r
+}
+func Add64M(p, q, r *[3]uint64) {
+	var c uint64
+	r[0], c = bits.Add64(p[0], q[0], c)
+	// arm64:"ADCS",-"ADD\t",-"CMP"
+	// amd64:"ADCQ",-"NEGL",-"SBBQ",-"NEGQ"
+	// ppc64: "ADDC", "ADDE", "ADDZE"
+	// ppc64le: "ADDC", "ADDE", "ADDZE"
+	// s390x:"ADDE",-"ADDC\t[$]-1,"
+	r[1], c = bits.Add64(p[1], q[1], c)
+	r[2], c = bits.Add64(p[2], q[2], c)
+}
+
+func 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
+}
+
+// --------------- //
+//    bits.Sub*    //
+// --------------- //
+
+func Sub(x, y, ci uint) (r, co uint) {
+	// amd64:"NEGL","SBBQ","NEGQ"
+	// arm64:"NEGS","SBCS","NGC","NEG",-"ADD",-"SUB",-"CMP"
+	// s390x:"SUBE"
+	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"
+	// s390x:"SUBE"
+	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"
+	// s390x:"SUBC"
+	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"
+	// s390x:"SUBE"
+	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"
+	// 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"
+	// s390x:"SUBE"
+	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"
+	// s390x:"SUBE"
+	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"
+	// s390x:"SUBC"
+	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"
+	// s390x:"SUBE"
+	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 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"
+	// ppc64:"MULHDU","MULLD"
+	// ppc64le:"MULHDU","MULLD"
+	// s390x:"MLGR"
+	// mips64: "MULVU"
+	return bits.Mul(x, y)
+}
+
+func Mul64(x, y uint64) (hi, lo uint64) {
+	// amd64:"MULQ"
+	// arm64:"UMULH","MUL"
+	// ppc64:"MULHDU","MULLD"
+	// ppc64le:"MULHDU","MULLD"
+	// s390x:"MLGR"
+	// mips64: "MULVU"
+	return bits.Mul64(x, y)
+}
+
+// --------------- //
+//    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)
+}