src/pkg/runtime/vlop_386.s

// Inferno's libkern/vlop-386.s
// http://code.google.com/p/inferno-os/source/browse/libkern/vlop-386.s
//
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/*
 * C runtime for 64-bit divide.
 */

TEXT _mul64by32(SB), 7, $0
	MOVL	r+0(FP), CX
	MOVL	a+4(FP), AX
	MULL	b+12(FP)
	MOVL	AX, 0(CX)
	MOVL	DX, BX
	MOVL	a+8(FP), AX
	MULL	b+12(FP)
	ADDL	AX, BX
	MOVL	BX, 4(CX)
	RET

TEXT _div64by32(SB), 7, $0
	MOVL	r+12(FP), CX
	MOVL	a+0(FP), AX
	MOVL	a+4(FP), DX
	DIVL	b+8(FP)
	MOVL	DX, 0(CX)
	RET