func MergeMuls1(n int) int {
	// amd64:"IMUL3Q\t[$]46"
	// 386:"IMUL3L\t[$]46"
	// ppc64x:"MULLD\t[$]46"
	return 15*n + 31*n // 46n
}

func MergeMuls2(n int) int {
	// amd64:"IMUL3Q\t[$]23","(ADDQ\t[$]29)|(LEAQ\t29)"
	// 386:"IMUL3L\t[$]23","ADDL\t[$]29"
	// ppc64x/power9:"MADDLD",-"MULLD\t[$]23",-"ADD\t[$]29"
	// ppc64x/power8:"MULLD\t[$]23","ADD\t[$]29"
	return 5*n + 7*(n+1) + 11*(n+2) // 23n + 29
}

#define POLY1305_MUL(h0, h1, h2, r0, r1, t0, t1, t2, t3, t4, t5) \
	MULLD  r0, h0, t0;  \
	MULHDU r0, h0, t1;  \
	MULLD  r0, h1, t4;  \
	MULHDU r0, h1, t5;  \
	ADDC   t4, t1, t1;  \
	MULLD  r0, h2, t2;  \
	MULHDU r1, h0, t4;  \
	MULLD  r1, h0, h0;  \
	ADDE   t5, t2, t2;  \
	ADDC   h0, t1, t1;  \
	MULLD  h2, r1, t3;  \
	ADDZE  t4, h0;      \
	MULHDU r1, h1, t5;  \
	MULLD  r1, h1, t4;  \
	ADDC   t4, t2, t2;  \
	ADDE   t5, t3, t3;  \

	MOVD	8(R3), R17	// z[i+1]
	MOVD	16(R3), R19	// z[i+2]
	MOVD	24(R3), R21	// z[i+3]
	MULLD	R5, R14, R10	// low x[i]*y
	MULHDU	R5, R14, R11	// high x[i]*y
	ADDC	R15, R10
	ADDZE	R11
	ADDC	R9, R10
	ADDZE	R11, R9
	MULLD	R5, R16, R14	// low x[i+1]*y
	MULHDU	R5, R16, R15	// high x[i+1]*y
	ADDC	R17, R14
	ADDZE	R15
	ADDC	R9, R14
	ADDZE	R15, R9
	MULLD	R5, R18, R16	// low x[i+2]*y
	MULHDU	R5, R18, R17	// high x[i+2]*y
	ADDC	R19, R16

	MOVD    24(R8), R22       // R22 = x[i+2]
	MOVDU   32(R8), R23       // R23 = x[i+3]
	MULLD   R9, R20, R24      // R24 = z0[i]
	MULHDU  R9, R20, R20      // R20 = z1[i]
	ADDC    R4, R24           // R24 = z0[i] + c
	MULLD   R9, R21, R25
	MULHDU  R9, R21, R21
	ADDE    R20, R25
	MULLD   R9, R22, R26
	MULHDU  R9, R22, R22
	MULLD   R9, R23, R27
	MULHDU  R9, R23, R23
	ADDE    R21, R26
	MOVD    R24, 8(R10)       // z[i]

}

func reverseOperandOrder(op Op) bool {
	switch op {
	// Special case for SUBF, SUBFC: not reversed
	case ADD, ADDC, ADDE, ADDCC, ADDCCC:
		return true
	case MULLW, MULLWCC, MULHW, MULHWCC, MULLD, MULLDCC, MULHD, MULHDCC, MULLWO, MULLWOCC, MULHWU, MULHWUCC, MULLDO, MULLDOCC:
		return true
	case DIVD, DIVDCC, DIVDU, DIVDUCC, DIVDE, DIVDECC, DIVDEU, DIVDEUCC, DIVDO, DIVDOCC, DIVDUO, DIVDUOCC:
		return true

	"FCFIDS",
	"FCFIDSCC",
	"FCTID",
	"FCTIDCC",
	"FCTIDZ",
	"FCTIDZCC",
	"LDAR",
	"MOVD",
	"MOVDU",
	"MOVWZ",
	"MOVWZU",
	"MULHD",
	"MULHDCC",
	"MULHDU",
	"MULHDUCC",
	"MULLD",
	"MULLDCC",
	"MULLDVCC",
	"MULLDV",
	"RFID",
	"RLDMI",
	"RLDMICC",
	"RLDIMI",
	"RLDIMICC",
	"RLDC",
	"RLDCCC",
	"RLDCR",
	"RLDCRCC",
	"RLDICR",
	"RLDICRCC",

	SUBW	$8192, R1, R2         // 1821c22500002000
	MULLW	R6, R7                // b91c0076
	MULLW	R6, R7, R8            // b9040087b91c0086
	MULLW	$8192, R6             // a76c2000
	MULLW	$8192, R6, R7         // 1876a77c2000
	MULLW	$-32769, R8           // c281ffff7fff
	MULLW   $-32769, R8, R9       // 1898c291ffff7fff
	MULLD	$-2147483648, R1      // c21080000000
	MULLD   $-2147483648, R1, R2  // b9040021c22080000000

import "cmd/internal/obj"

var Anames = []string{
	obj.A_ARCHSPECIFIC: "ADD",
	"ADDC",
	"ADDE",
	"ADDW",
	"DIVW",
	"DIVWU",
	"DIVD",
	"DIVDU",
	"MODW",
	"MODWU",
	"MODD",
	"MODDU",
	"MULLW",
	"MULLD",
	"MULHD",
	"MULHDU",
	"MLGR",
	"SUB",
	"SUBC",
	"SUBV",
	"SUBE",
	"SUBW",
	"NEG",
	"NEGW",
	"MOVWBR",
	"MOVB",
	"MOVBZ",
	"MOVH",
	"MOVHBR",
	"MOVHZ",
	"MOVW",
	"MOVWZ",

	// Use magic constant 0x8637bd06 and shift right 51
	// to perform usec/1000000.
	MOVD	$0x8637bd06, R4
	MULLD	R3, R4, R4	// Convert usec to S.
	SRD	$51, R4, R4
	MOVD	R4, 8(R1)	// Store to tv_sec

	MOVD	$1000000, R5
	MULLW	R4, R5, R5	// Convert tv_sec back into uS
	SUB	R5, R3, R5	// Compute remainder uS.
	MULLD	$1000, R5, R5	// Convert to nsec
	MOVD	R5, 16(R1)	// Store to tv_nsec

	// nanosleep(&ts, 0)

	SYSCALL
	MOVW	R2, errno+16(FP)
	RET

TEXT runtime·usleep(SB),NOSPLIT,$16-4
	MOVW	usec+0(FP), R2
	MOVD	R2, R4
	MOVW	$1000000, R3
	DIVD	R3, R2
	MOVD	R2, 8(R15)
	MOVW	$1000, R3
	MULLD	R2, R3
	SUB	R3, R4
	MOVD	R4, 16(R15)

	// nanosleep(&ts, 0)
	ADD	$8, R15, R2
	MOVW	$0, R3
	MOVW	$SYS_nanosleep, R1
	SYSCALL
	RET

TEXT runtime·gettid(SB),NOSPLIT,$0-4