// r2 += 19×a3×b4
	MOVQ   24(CX), AX
	IMUL3Q $0x13, AX, AX
	MULQ   32(BX)
	ADDQ   AX, R11
	ADCQ   DX, R10

	// r2 += 19×a4×b3
	MOVQ   32(CX), AX
	IMUL3Q $0x13, AX, AX
	MULQ   24(BX)
	ADDQ   AX, R11
	ADCQ   DX, R10

	// r3 = a0×b3
	MOVQ (CX), AX
	MULQ 24(BX)
	MOVQ AX, R13
	MOVQ DX, R12

	// r3 += a1×b2
	MOVQ 8(CX), AX
	MULQ 16(BX)
	ADDQ AX, R13

00000250  01 5f aa d3 16 61 09 a2  76 fd 13 c3 cc e1 0c 5c  |._...a..v......\|
00000260  ee b1 87 82 f1 6c 04 ed  73 bb b3 43 77 8d 0c 1c  |.....l..s..Cw...|
00000270  f1 0f a1 d8 40 83 61 c9  4c 72 2b 9d ae db 46 06  |******@****.***+...F.|
00000280  06 4d f4 c1 b3 3e c0 d1  bd 42 d4 db fe 3d 13 60  |.M...>...B...=.`|
00000290  84 5c 21 d3 3b e9 fa e7  16 03 03 00 23 0d 00 00  |.\!.;.......#...|

00000250  01 5f aa d3 16 61 09 a2  76 fd 13 c3 cc e1 0c 5c  |._...a..v......\|
00000260  ee b1 87 82 f1 6c 04 ed  73 bb b3 43 77 8d 0c 1c  |.....l..s..Cw...|
00000270  f1 0f a1 d8 40 83 61 c9  4c 72 2b 9d ae db 46 06  |******@****.***+...F.|
00000280  06 4d f4 c1 b3 3e c0 d1  bd 42 d4 db fe 3d 13 60  |.M...>...B...=.`|
00000290  84 5c 21 d3 3b e9 fa e7  16 03 03 00 04 0e 00 00  |.\!.;...........|

00000330  1a 69 33 a6 ad c6 1f ab  08 12 31 b4 c7 41 ac c5  |.i3.......1..A..|
00000340  b3 e5 4b 84 56 d9 0c 53  58 4c 8f 40 3a 34 66 d0  |..K.V..SXL.@:4f.|
00000350  c7 8f 9b b3 26 25 1f 68  fc 97 ba a7 de ac cf c5  |....&%.h........|
00000360  8b b3 26 99 68 6e ca e9  65 47 07 bd 38 15 f3 0c  |..&.hn..eG..8...|
00000370  d0 14 8e 6d 89 a2 ad cd  ad ef 00 54 07 5a 4b ef  |...m.......T.ZK.|

// multiple initialization
const (
	a1, a2, a3 = 7, 3.1415926, "foo"
	b1, b2, b3 = b3, b1, 42
	c1, c2, c3  /* ERROR "missing init expr for c3" */ = 1, 2
	d1, d2, d3 = 1, 2, 3, 4 /* ERROR "extra init expr 4" */
	_p0 = assert(a1 == 7)
	_p1 = assert(a2 == 3.1415926)
	_p2 = assert(a3 == "foo")
	_p3 = assert(b1 == 42)
	_p4 = assert(b2 == 42)
	_p5 = assert(b3 == 42)
)

func _() {
	const (
		a1, a2, a3 = 7, 3.1415926, "foo"

			b1, b5, b9, b13 = qr(b1, b5, b9, b13)
			b2, b6, b10, b14 = qr(b2, b6, b10, b14)
			b3, b7, b11, b15 = qr(b3, b7, b11, b15)

			b0, b5, b10, b15 = qr(b0, b5, b10, b15)
			b1, b6, b11, b12 = qr(b1, b6, b11, b12)
			b2, b7, b8, b13 = qr(b2, b7, b8, b13)
			b3, b4, b9, b14 = qr(b3, b4, b9, b14)
		}

		// Store block i back into b[*][i].
		// Add b4..b11 back to the original key material,

00000250  01 5f aa d3 16 61 09 a2  76 fd 13 c3 cc e1 0c 5c  |._...a..v......\|
00000260  ee b1 87 82 f1 6c 04 ed  73 bb b3 43 77 8d 0c 1c  |.....l..s..Cw...|
00000270  f1 0f a1 d8 40 83 61 c9  4c 72 2b 9d ae db 46 06  |******@****.***+...F.|
00000280  06 4d f4 c1 b3 3e c0 d1  bd 42 d4 db fe 3d 13 60  |.M...>...B...=.`|
00000290  84 5c 21 d3 3b e9 fa e7  16 03 03 00 23 0d 00 00  |.\!.;.......#...|

00000300  a8 15 d6 b7 cc cd ed 28  5a 8e de 64 ae 85 f5 0d  |.......(Z..d....|
00000310  7f 58 66 17 03 03 00 99  51 80 02 3d be 7a 45 b3  |.Xf.....Q..=.zE.|
00000320  c3 f6 68 39 59 03 7b 2e  0c b3 22 f1 b3 6e a6 b2  |..h9Y.{..."..n..|
00000330  64 f4 c6 77 7b 38 e0 94  97 2c 69 5b 29 63 e2 6b  |d..w{8...,i[)c.k|
00000340  d5 d4 d0 b4 c1 45 04 4c  c4 19 6d 75 fd ef 3a 77  |.....E.L..mu..:w|

00000280  ea 1f 78 d0 ff ac c4 19  54 a1 c6 2d 8a da cd f3  |..x.....T..-....|
00000290  6e 45 b3 a4 dc e3 a0 6e  f8 18 af a6 c6 20 ce a7  |nE.....n..... ..|
000002a0  eb dc 42 06 bd d4 bf a0  ef 36 4c f6 38 42 3d f7  |..B......6L.8B=.|
000002b0  a3 a5 ac 4d b3 71 36 9b  00 ee 1f 40 fa bc b3 d4  |...M.q6....@....|
000002c0  5b 49 79 4f 16 fd 3e 4f  ab 8e cc 92 7d f3 1d c7  |[IyO..>O....}...|

00000290  73 bb b3 43 77 8d 0c 1c  f1 0f a1 d8 40 83 61 c9  |s..Cw.......@.a.|
000002a0  4c 72 2b 9d ae db 46 06  06 4d f4 c1 b3 3e c0 d1  |Lr+...F..M...>..|
000002b0  bd 42 d4 db fe 3d 13 60  84 5c 21 d3 3b e9 fa e7  |.B...=.`.\!.;...|
000002c0  16 03 03 00 ac 0c 00 00  a8 03 00 1d 20 ea 03 c7  |............ ...|
000002d0  b0 eb 76 ba 86 25 18 e5  0d b3 70 2a 41 72 4d 88  |..v..%....p*ArM.|