// There is no TLS base pointer.
#ifdef GOARCH_mips64
	MOVW	4(R29), R4 // argc, big-endian ABI places int32 at offset 4
#else
	MOVW	0(R29), R4 // argc
#endif
	ADDV	$8, R29, R5 // argv
	JMP	main(SB)

TEXT main(SB),NOSPLIT|NOFRAME,$0
	// in external linking, glibc jumps to main with argc in R4
	// and argv in R5

	// initialize REGSB = PC&0xffffffff00000000
	BGEZAL	R0, 1(PC)

(Select0 <t> (Add64carry x y c)) => (ADDV (ADDV <t> x y) c)
(Select1 <t> (Add64carry x y c)) =>
	(OR (SGTU <t> x s:(ADDV <t> x y)) (SGTU <t> s (ADDV <t> s c)))

(Select0 <t> (Sub64borrow x y c)) => (SUBV (SUBV <t> x y) c)
(Select1 <t> (Sub64borrow x y c)) =>
	(OR (SGTU <t> s:(SUBV <t> x y) x) (SGTU <t> (SUBV <t> s c) s))

// (x + y) / 2 with x>=y => (x - y) / 2 + y
(Avg64u <t> x y) => (ADDV (SRLVconst <t> (SUBV <t> x y) [1]) y)

		// arg2 = address of the last element of src
		// arg3 = mem
		// auxint = alignment
		// returns mem
		//	MOVx	(R20), Rtmp
		//	MOVx	Rtmp, (R21)
		//	ADDV	$sz, R20
		//	ADDV	$sz, R21
		//	BGEU	Rarg2, R20, -4(PC)
		{
			name:      "LoweredMove",
			aux:       "Int64",
			argLength: 4,
			reg: regInfo{
				inputs:   []regMask{buildReg("R21"), buildReg("R20"), gp},

		// arg2 = address of the last element of src
		// arg3 = mem
		// auxint = alignment
		// returns mem
		//	SUBV	$8, R1
		//	MOVV	8(R1), Rtmp
		//	MOVV	Rtmp, (R2)
		//	ADDV	$8, R1
		//	ADDV	$8, R2
		//	BNE	Rarg2, R1, -4(PC)
		{
			name:      "LoweredMove",
			aux:       "Int64",
			argLength: 4,
			reg: regInfo{
				inputs:   []regMask{buildReg("R2"), buildReg("R1"), gp},

(Mod8 x y) => (Select0 (DIVV (SignExt8to64 x) (SignExt8to64 y)))
(Mod8u x y) => (Select0 (DIVVU (ZeroExt8to64 x) (ZeroExt8to64 y)))

(Select0 <t> (Add64carry x y c)) => (ADDV (ADDV <t> x y) c)
(Select1 <t> (Add64carry x y c)) =>
	(OR (SGTU <t> x s:(ADDV <t> x y)) (SGTU <t> s (ADDV <t> s c)))

(Select0 <t> (Sub64borrow x y c)) => (SUBV (SUBV <t> x y) c)
(Select1 <t> (Sub64borrow x y c)) =>
	(OR (SGTU <t> s:(SUBV <t> x y) x) (SGTU <t> (SUBV <t> s c) s))

	// argv as argc string pointers followed by a NULL, envv as a
	// sequence of string pointers followed by a NULL, and auxv.
	// There is no TLS base pointer.
	MOVW	0(R3), R4	// argc
	ADDV	$8, R3, R5	// argv
	JMP	main(SB)

// When building with -buildmode=c-shared, this symbol is called when the shared
// library is loaded.
TEXT _rt0_loong64_linux_lib(SB),NOSPLIT,$168
	// Preserve callee-save registers.

	MOVV 64(R29), R8
	MOVV 56(R29), R7
	MOVV 48(R29), R6
	MOVV 40(R29), R5
	MOVV 32(R29), R4
	MOVV 24(R29), R3
	MOVV 16(R29), R2
	MOVV 8(R29), R1
	MOVV 488(R29), R31
	MOVV (R29), R23
	ADDV $496, R29

	MOVV	a4+32(FP), R7
	MOVV	a5+40(FP), R8
	MOVV	a6+48(FP), R9
	MOVV	a7+56(FP), R10
	MOVV	a8+64(FP), R11
	MOVV	a9+72(FP), R12
	SUBVU	$16, R29
	MOVV	R12, 0(R29)	// arg 9 - only used for SYS_syscall.
	SYSCALL
	ADDV    $16, R29
	BEQ	R7, ok9
	MOVV	$-1, R1
	MOVV	R1, r1+80(FP)	// r1
	MOVV	R0, r2+88(FP)	// r2
	MOVV	R2, err+96(FP)	// errno
	JAL	runtime·exitsyscall(SB)
	RET
ok9:
	MOVV	R2, r1+80(FP)	// r1

	MOVV 72(R3), R12
	MOVV 64(R3), R11
	MOVV 56(R3), R10
	MOVV 48(R3), R9
	MOVV 40(R3), R8
	MOVV 32(R3), R7
	MOVV 24(R3), R6
	MOVV 16(R3), R5
	MOVV 8(R3), R4
	MOVV 480(R3), R1
	MOVV (R3), R30
	ADDV $488, R3

	MOVV	$1000, R6
	MULVU	R6, R7, R7
	MOVV	$1000000000, R6

	DIVVU	R6, R7, R5	// ts->tv_sec
	REMVU	R6, R7, R4	// ts->tv_nsec
	MOVV	R5, 8(R3)
	MOVV	R4, 16(R3)

	// nanosleep(&ts, 0)
	ADDV	$8, R3, R4
	MOVV	R0, R5
	MOVV	$SYS_nanosleep, R11
	SYSCALL
	RET

// func gettid() uint32
TEXT runtime·gettid(SB),NOSPLIT,$0-4
	MOVV	$SYS_gettid, R11
	SYSCALL
	MOVW	R4, ret+0(FP)
	RET