//    Multiplication    //
// -------------------- //

func Pow2Muls(n1, n2 int) (int, int) {
	// amd64:"SHLQ\t[$]5",-"IMULQ"
	// 386:"SHLL\t[$]5",-"IMULL"
	// arm:"SLL\t[$]5",-"MUL"
	// arm64:"LSL\t[$]5",-"MUL"
	// ppc64x:"SLD\t[$]5",-"MUL"
	a := n1 * 32

	// amd64:"SHLQ\t[$]6",-"IMULQ"
	// 386:"SHLL\t[$]6",-"IMULL"
	// arm:"SLL\t[$]6",-"MUL"
	// arm64:`NEG\sR[0-9]+<<6,\sR[0-9]+`,-`LSL`,-`MUL`

	XORQ DI, DI

	// Iteration 0
	MOVQ (BX), AX
	MULQ SI
	ADDQ (CX), AX
	ADCQ $0x00, DX
	ADDQ DI, AX
	ADCQ $0x00, DX
	MOVQ DX, DI
	MOVQ AX, (CX)

	// Iteration 1
	MOVQ 8(BX), AX
	MULQ SI
	ADDQ 8(CX), AX
	ADCQ $0x00, DX
	ADDQ DI, AX
	ADCQ $0x00, DX
	MOVQ DX, DI
	MOVQ AX, 8(CX)

	// Iteration 2
	MOVQ 16(BX), AX
	MULQ SI
	ADDQ 16(CX), AX
	ADCQ $0x00, DX
	ADDQ DI, AX

	MOVQ (8*0)(x_ptr), t0

	MOVQ (8*1)(x_ptr), AX
	MULQ t0
	MOVQ AX, acc1
	MOVQ DX, acc2

	MOVQ (8*2)(x_ptr), AX
	MULQ t0
	ADDQ AX, acc2
	ADCQ $0, DX
	MOVQ DX, acc3

	MOVQ (8*3)(x_ptr), AX
	MULQ t0
	ADDQ AX, acc3
	ADCQ $0, DX
	MOVQ DX, acc4
	// y[2:] * y[1]
	MOVQ (8*1)(x_ptr), t0

	MOVQ (8*2)(x_ptr), AX
	MULQ t0
	ADDQ AX, acc3
	ADCQ $0, DX
	MOVQ DX, t1

	"HADDPD",
	"HADDPS",
	"HLT",
	"HSUBPD",
	"HSUBPS",
	"ICEBP",
	"IDIVB",
	"IDIVL",
	"IDIVQ",
	"IDIVW",
	"IMUL3L",
	"IMUL3Q",
	"IMUL3W",
	"IMULB",
	"IMULL",
	"IMULQ",
	"IMULW",
	"INB",
	"INCB",
	"INCL",
	"INCQ",
	"INCW",
	"INL",
	"INSB",
	"INSERTPS",
	"INSL",
	"INSW",
	"INT",
	"INTO",
	"INVD",
	"INVLPG",
	"INVPCID",
	"INW",

//   Code generation for unsafe.Slice      //
// --------------------------------------- //

func Slice1(p *byte, i int) []byte {
	// amd64:-"MULQ"
	return unsafe.Slice(p, i)
}
func Slice0(p *struct{}, i int) []struct{} {
	// amd64:-"MULQ"
	return unsafe.Slice(p, i)

//    bits.Mul*    //
// --------------- //

func Mul(x, y uint) (hi, lo uint) {
	// amd64:"MULQ"
	// arm64:"UMULH","MUL"
	// ppc64x:"MULHDU","MULLD"
	// s390x:"MLGR"
	// mips64: "MULVU"
	// riscv64:"MULHU","MUL"
	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"

	LEAQ	8(SP), SI		// arg 2 - tp
	MOVL	$SYS___clock_gettime50, AX
	SYSCALL
	MOVQ	8(SP), AX		// sec
	MOVQ	16(SP), DX		// nsec

	// sec is in AX, nsec in DX
	// return nsec in AX
	IMULQ	$1000000000, AX
	ADDQ	DX, AX
	MOVQ	AX, ret+0(FP)
	RET

TEXT runtime·getcontext(SB),NOSPLIT,$-8
	MOVQ	ctxt+0(FP), DI		// arg 1 - context
	MOVL	$SYS_getcontext, AX
	SYSCALL
	JCC	2(PC)

	AMOVSQ
	AMOVSS
	AMOVSW
	AMOVSWW
	AMOVUPD
	AMOVUPS
	AMOVW
	AMOVWLSX
	AMOVWLZX
	AMOVWQSX
	AMOVWQZX
	AMOVZWW
	AMPSADBW
	AMULB
	AMULL
	AMULPD
	AMULPS
	AMULQ
	AMULSD
	AMULSS
	AMULW
	AMULXL
	AMULXQ
	AMWAIT
	ANEGB
	ANEGL
	ANEGQ
	ANEGW
	ANOPL
	ANOPW
	ANOTB
	ANOTL
	ANOTQ
	ANOTW
	AORB
	AORL
	AORPD
	AORPS

	MOVL	$SYS_clock_gettime, AX
	MOVQ	$CLOCK_MONOTONIC, DI
	LEAQ	8(SP), SI
	SYSCALL
	MOVQ	8(SP), AX	// sec
	MOVQ	16(SP), DX	// nsec

	// sec is in AX, nsec in DX
	// return nsec in AX
	IMULQ	$1000000000, AX
	ADDQ	DX, AX
	MOVQ	AX, ret+0(FP)
	RET

TEXT runtime·asmSigaction(SB),NOSPLIT,$0
	MOVQ	sig+0(FP), DI		// arg 1 sig
	MOVQ	new+8(FP), SI		// arg 2 act
	MOVQ	old+16(FP), DX		// arg 3 oact

	// we cannot receive another signal.
	MOVQ	8(SP), CX
	MOVQ	CX, m_vdsoSP(BX)
	MOVQ	0(SP), CX
	MOVQ	CX, m_vdsoPC(BX)
	// sec is in AX, nsec in DX
	// return nsec in AX
	IMULQ	$1000000000, AX
	ADDQ	DX, AX
	MOVQ	AX, ret+0(FP)
	RET
fallback:
	MOVQ	$SYS_clock_gettime, AX
	SYSCALL
	JMP	ret

TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0-28
	MOVL	how+0(FP), DI