From 43a123c1ae6613b3efeed291fa552ecd909d3acf Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Tue, 16 Apr 2024 21:23:18 +0200
Subject: Adding upstream version 1.20.14.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 test/codegen/mathbits.go | 903 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 903 insertions(+)
 create mode 100644 test/codegen/mathbits.go

(limited to 'test/codegen/mathbits.go')

diff --git a/test/codegen/mathbits.go b/test/codegen/mathbits.go
new file mode 100644
index 0000000..b506a37
--- /dev/null
+++ b/test/codegen/mathbits.go
@@ -0,0 +1,903 @@
+// 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/v1,amd64/v2:"BSRQ"
+	// amd64/v3:"LZCNTQ", -"BSRQ"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	// ppc64le:"CNTLZD"
+	// ppc64:"CNTLZD"
+	return bits.LeadingZeros(n)
+}
+
+func LeadingZeros64(n uint64) int {
+	// amd64/v1,amd64/v2:"BSRQ"
+	// amd64/v3:"LZCNTQ", -"BSRQ"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	// ppc64le:"CNTLZD"
+	// ppc64:"CNTLZD"
+	return bits.LeadingZeros64(n)
+}
+
+func LeadingZeros32(n uint32) int {
+	// amd64/v1,amd64/v2:"BSRQ","LEAQ",-"CMOVQEQ"
+	// amd64/v3: "LZCNTL",- "BSRL"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZW"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	// ppc64le:"CNTLZW"
+	// ppc64:"CNTLZW"
+	return bits.LeadingZeros32(n)
+}
+
+func LeadingZeros16(n uint16) int {
+	// amd64/v1,amd64/v2:"BSRL","LEAL",-"CMOVQEQ"
+	// amd64/v3: "LZCNTL",- "BSRL"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	// ppc64le:"CNTLZD"
+	// ppc64:"CNTLZD"
+	return bits.LeadingZeros16(n)
+}
+
+func LeadingZeros8(n uint8) int {
+	// amd64/v1,amd64/v2:"BSRL","LEAL",-"CMOVQEQ"
+	// amd64/v3: "LZCNTL",- "BSRL"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	// ppc64le:"CNTLZD"
+	// ppc64:"CNTLZD"
+	return bits.LeadingZeros8(n)
+}
+
+// --------------- //
+//    bits.Len*    //
+// --------------- //
+
+func Len(n uint) int {
+	// amd64/v1,amd64/v2:"BSRQ"
+	// amd64/v3: "LZCNTQ"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	// ppc64le:"SUBC","CNTLZD"
+	// ppc64:"SUBC","CNTLZD"
+	return bits.Len(n)
+}
+
+func Len64(n uint64) int {
+	// amd64/v1,amd64/v2:"BSRQ"
+	// amd64/v3: "LZCNTQ"
+	// 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/v1,amd64/v2:"BSRQ","LEAQ",-"CMOVQEQ"
+	// amd64/v3: "LZCNTL"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	// ppc64: "CNTLZW"
+	// ppc64le: "CNTLZW"
+	return bits.Len32(n)
+}
+
+func Len16(n uint16) int {
+	// amd64/v1,amd64/v2:"BSRL","LEAL",-"CMOVQEQ"
+	// amd64/v3: "LZCNTL"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	// ppc64le:"SUBC","CNTLZD"
+	// ppc64:"SUBC","CNTLZD"
+	return bits.Len16(n)
+}
+
+func Len8(n uint8) int {
+	// amd64/v1,amd64/v2:"BSRL","LEAL",-"CMOVQEQ"
+	// amd64/v3: "LZCNTL"
+	// s390x:"FLOGR"
+	// arm:"CLZ" arm64:"CLZ"
+	// mips:"CLZ"
+	// wasm:"I64Clz"
+	// ppc64le:"SUBC","CNTLZD"
+	// ppc64:"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/v2:-".*x86HasPOPCNT" amd64/v3:-".*x86HasPOPCNT"
+	// amd64:"POPCNTQ"
+	// arm64:"VCNT","VUADDLV"
+	// s390x:"POPCNT"
+	// ppc64:"POPCNTD"
+	// ppc64le:"POPCNTD"
+	// wasm:"I64Popcnt"
+	return bits.OnesCount(n)
+}
+
+func OnesCount64(n uint64) int {
+	// amd64/v2:-".*x86HasPOPCNT" amd64/v3:-".*x86HasPOPCNT"
+	// amd64:"POPCNTQ"
+	// arm64:"VCNT","VUADDLV"
+	// s390x:"POPCNT"
+	// ppc64:"POPCNTD"
+	// ppc64le:"POPCNTD"
+	// wasm:"I64Popcnt"
+	return bits.OnesCount64(n)
+}
+
+func OnesCount32(n uint32) int {
+	// amd64/v2:-".*x86HasPOPCNT" amd64/v3:-".*x86HasPOPCNT"
+	// amd64:"POPCNTL"
+	// arm64:"VCNT","VUADDLV"
+	// s390x:"POPCNT"
+	// ppc64:"POPCNTW"
+	// ppc64le:"POPCNTW"
+	// wasm:"I64Popcnt"
+	return bits.OnesCount32(n)
+}
+
+func OnesCount16(n uint16) int {
+	// amd64/v2:-".*x86HasPOPCNT" amd64/v3:-".*x86HasPOPCNT"
+	// 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, s int) uint16 {
+	// amd64:"ROLW" 386:"ROLW"
+	// arm64:"RORW",-"CSEL"
+	return bits.RotateLeft16(n, s)
+}
+
+func RotateLeft8(n uint8, s int) uint8 {
+	// amd64:"ROLB" 386:"ROLB"
+	// arm64:"LSL","LSR",-"CSEL"
+	return bits.RotateLeft8(n, s)
+}
+
+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/v1,amd64/v2:"BSFQ","MOVL\t\\$64","CMOVQEQ"
+	// amd64/v3:"TZCNTQ"
+	// 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/v1,amd64/v2:"BSFQ","MOVL\t\\$64","CMOVQEQ"
+	// amd64/v3:"TZCNTQ"
+	// 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/v1,amd64/v2:"BTSQ\\t\\$32","BSFQ"
+	// amd64/v3:"TZCNTL"
+	// 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/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"
+	// ppc64: "ADDC", "ADDE", "ADDZE"
+	// ppc64le: "ADDC", "ADDE", "ADDZE"
+	// s390x:"ADDE","ADDC\t[$]-1,"
+	// riscv64: "ADD","SLTU"
+	return bits.Add(x, y, ci)
+}
+
+func AddC(x, ci uint) (r, co uint) {
+	// arm64:"ADDS","ADCS","ADC",-"ADD\t",-"CMP"
+	// amd64:"NEGL","ADCQ","SBBQ","NEGQ"
+	// loong64: "ADDV", "SGTU"
+	// ppc64: "ADDC", "ADDE", "ADDZE"
+	// ppc64le: "ADDC", "ADDE", "ADDZE"
+	// s390x:"ADDE","ADDC\t[$]-1,"
+	// 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"
+	// ppc64: "ADDC", -"ADDE", "ADDZE"
+	// ppc64le: "ADDC", -"ADDE", "ADDZE"
+	// s390x:"ADDC",-"ADDC\t[$]-1,"
+	// riscv64: "ADD","SLTU"
+	return bits.Add(x, y, 0)
+}
+
+func AddR(x, y, ci uint) uint {
+	// arm64:"ADDS","ADCS",-"ADD\t",-"CMP"
+	// amd64:"NEGL","ADCQ",-"SBBQ",-"NEGQ"
+	// loong64: "ADDV", -"SGTU"
+	// ppc64: "ADDC", "ADDE", -"ADDZE"
+	// ppc64le: "ADDC", "ADDE", -"ADDZE"
+	// s390x:"ADDE","ADDC\t[$]-1,"
+	// 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[$]-1,"
+	r[1], c = bits.Add(p[1], q[1], c)
+	r[2], c = bits.Add(p[2], q[2], c)
+}
+
+func Add64(x, y, ci uint64) (r, co uint64) {
+	// arm64:"ADDS","ADCS","ADC",-"ADD\t",-"CMP"
+	// amd64:"NEGL","ADCQ","SBBQ","NEGQ"
+	// loong64: "ADDV", "SGTU"
+	// ppc64: "ADDC", "ADDE", "ADDZE"
+	// ppc64le: "ADDC", "ADDE", "ADDZE"
+	// s390x:"ADDE","ADDC\t[$]-1,"
+	// 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"
+	// ppc64: "ADDC", "ADDE", "ADDZE"
+	// ppc64le: "ADDC", "ADDE", "ADDZE"
+	// s390x:"ADDE","ADDC\t[$]-1,"
+	// riscv64: "ADD","SLTU"
+	return bits.Add64(x, 7, ci)
+}
+
+func Add64Z(x, y uint64) (r, co uint64) {
+	// arm64:"ADDS","ADC",-"ADCS",-"ADD\t",-"CMP"
+	// amd64:"ADDQ","SBBQ","NEGQ",-"NEGL",-"ADCQ"
+	// loong64: "ADDV", "SGTU"
+	// ppc64: "ADDC", -"ADDE", "ADDZE"
+	// ppc64le: "ADDC", -"ADDE", "ADDZE"
+	// s390x:"ADDC",-"ADDC\t[$]-1,"
+	// 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"
+	// ppc64: "ADDC", "ADDE", -"ADDZE"
+	// ppc64le: "ADDC", "ADDE", -"ADDZE"
+	// s390x:"ADDE","ADDC\t[$]-1,"
+	// riscv64: "ADD",-"SLTU"
+	r, _ := bits.Add64(x, y, ci)
+	return r
+}
+func Add64M(p, q, r *[3]uint64) {
+	var c uint64
+	r[0], c = bits.Add64(p[0], q[0], c)
+	// arm64:"ADCS",-"ADD\t",-"CMP"
+	// amd64:"ADCQ",-"NEGL",-"SBBQ",-"NEGQ"
+	// ppc64: -"ADDC", "ADDE", -"ADDZE"
+	// ppc64le: -"ADDC", "ADDE", -"ADDZE"
+	// s390x:"ADDE",-"ADDC\t[$]-1,"
+	r[1], c = bits.Add64(p[1], q[1], c)
+	r[2], c = bits.Add64(p[2], q[2], c)
+}
+
+func Add64MSaveC(p, q, r, c *[2]uint64) {
+	// ppc64: "ADDC\tR", "ADDZE"
+	// ppc64le: "ADDC\tR", "ADDZE"
+	r[0], c[0] = bits.Add64(p[0], q[0], 0)
+	// ppc64: "ADDC\t[$]-1", "ADDE", "ADDZE"
+	// ppc64le: "ADDC\t[$]-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]
+
+	// ppc64: "ADDC\tR\\d+,", -"ADDE", -"MOVD\tXER"
+	// ppc64le: "ADDC\tR\\d+,", -"ADDE", -"MOVD\tXER"
+	d1, cx = bits.Add64(a1, b1, 0)
+	// ppc64: "ADDE", -"ADDC", -"MOVD\t.*, XER"
+	// ppc64le: "ADDE", -"ADDC", -"MOVD\t.*, XER"
+	d2, _ = bits.Add64(a2, b2, cx)
+
+	// ppc64: "ADDC\tR\\d+,", -"ADDE", -"MOVD\tXER"
+	// ppc64le: "ADDC\tR\\d+,", -"ADDE", -"MOVD\tXER"
+	d1, cx = bits.Add64(c1, d1, 0)
+	// ppc64: "ADDE", -"ADDC", -"MOVD\t.*, XER"
+	// ppc64le: "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"
+	// ppc64:"SUBC", "SUBE", "SUBZE", "NEG"
+	// ppc64le:"SUBC", "SUBE", "SUBZE", "NEG"
+	// s390x:"SUBE"
+	// 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"
+	// ppc64:"SUBC", "SUBE", "SUBZE", "NEG"
+	// ppc64le:"SUBC", "SUBE", "SUBZE", "NEG"
+	// s390x:"SUBE"
+	// 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"
+	// ppc64:"SUBC", -"SUBE", "SUBZE", "NEG"
+	// ppc64le:"SUBC", -"SUBE", "SUBZE", "NEG"
+	// s390x:"SUBC"
+	// 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"
+	// ppc64:"SUBC", "SUBE", -"SUBZE", -"NEG"
+	// ppc64le:"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"
+	// ppc64:-"SUBC", "SUBE", -"SUBZE", -"NEG"
+	// ppc64le:-"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"
+	// ppc64:"SUBC", "SUBE", "SUBZE", "NEG"
+	// ppc64le:"SUBC", "SUBE", "SUBZE", "NEG"
+	// s390x:"SUBE"
+	// 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"
+	// ppc64:"SUBC", "SUBE", "SUBZE", "NEG"
+	// ppc64le:"SUBC", "SUBE", "SUBZE", "NEG"
+	// s390x:"SUBE"
+	// 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"
+	// ppc64:"SUBC", -"SUBE", "SUBZE", "NEG"
+	// ppc64le:"SUBC", -"SUBE", "SUBZE", "NEG"
+	// s390x:"SUBC"
+	// 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"
+	// ppc64:"SUBC", "SUBE", -"SUBZE", -"NEG"
+	// ppc64le:"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) {
+	// ppc64:"SUBC\tR\\d+, R\\d+,", "SUBZE", "NEG"
+	// ppc64le:"SUBC\tR\\d+, R\\d+,", "SUBZE", "NEG"
+	r[0], c[0] = bits.Sub64(p[0], q[0], 0)
+	// ppc64:"SUBC\tR\\d+, [$]0,", "SUBE", "SUBZE", "NEG"
+	// ppc64le:"SUBC\tR\\d+, [$]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"
+	// 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"
+	// 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)
+}
-- 
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