X15:  "%xmm15",
	CS:   "%cs",
	SS:   "%ss",
	DS:   "%ds",
	ES:   "%es",
	FS:   "%fs",
	GS:   "%gs",
	GDTR: "%gdtr",
	IDTR: "%idtr",
	LDTR: "%ldtr",
	MSW:  "%msw",
	TASK: "%task",
	CR0:  "%cr0",
	CR1:  "%cr1",
	CR2:  "%cr2",
	CR3:  "%cr3",
	CR4:  "%cr4",
	CR5:  "%cr5",
	CR6:  "%cr6",
	CR7:  "%cr7",
	CR8:  "%cr8",
	CR9:  "%cr9",
	CR10: "%cr10",
	CR11: "%cr11",

	xReadCp     // read cp
	xReadCm     // read cm

	xArg1            // arg 1
	xArg3            // arg 3
	xArgAL           // arg AL
	xArgAX           // arg AX
	xArgCL           // arg CL
	xArgCR0dashCR7   // arg CR0-CR7
	xArgCS           // arg CS
	xArgDR0dashDR7   // arg DR0-DR7
	xArgDS           // arg DS
	xArgDX           // arg DX
	xArgEAX          // arg EAX
	xArgEDX          // arg EDX
	xArgES           // arg ES

	})
}

type Matrix [][]float64

func BenchmarkMatmult(b *testing.B) {
	b.StopTimer()
	// matmult is O(N**3) but testing expects O(b.N),
	// so we need to take cube root of b.N
	n := int(math.Cbrt(float64(b.N))) + 1
	A := makeMatrix(n)
	B := makeMatrix(n)
	C := makeMatrix(n)
	b.StartTimer()
	matmult(nil, A, B, C, 0, n, 0, n, 0, n, 8)
}

func makeMatrix(n int) Matrix {
	m := make(Matrix, n)

			0000010: 0000 0001 0000 0001 0803 0000 0028 cb34  .............(.4
			0000020: bb00 0000 0350 4c54 45ff 0000 19e2 0937  .....PLTE......7
			0000030: 0000 0001 7452 4e53 7f80 5cb4 cb00 0000  ....tRNS..\.....
			0000040: 0e49 4441 5478 9c62 6200 0400 00ff ff00  .IDATx.bb.......
			0000050: 0600 03fa d059 ae00 0000 0049 454e 44ae  .....Y.....IEND.
			0000060: 4260 82                                  B`.

	"F26",
	"F27",
	"F28",
	"F29",
	"F30",
	// "F31", the allocator is limited to 64 entries. We sacrifice this FPR to support XER.

	"XER",

	// If you add registers, update asyncPreempt in runtime.

	// "CR0",
	// "CR1",
	// "CR2",
	// "CR3",
	// "CR4",
	// "CR5",
	// "CR6",
	// "CR7",

	// "CR",
	// "LR",
	// "CTR",
}

func init() {
	// Make map from reg names to reg integers.

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