Changeset 10790:25e772c6cb98
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x86: reimplement integer division

This patch reimplements integer division for x86 architecture. Earlier the
division algorithm was implemented using microops.  I don't think that's what
happens in actual implementations.  As I have read, there is separate division
unit that would carry out the whole operation.  This means we only need to
issue a small number of microops, not a microop for each bit of the dividend,
as is happening currently.  This patch implements the division algorithm in a
using four microops.  The first microop reads the higher part of the dividend
and the divisor and records them in local registers.  The second microop reads
the lower part of the dividend and carries out the division algorithm.  The
next two microops populate the remainder and quotient registers (unchanged from
before).