[Sbcl-devel] Patch for review: move-to-word/integer and fixnump hack

[Douglas Katzman]

With single-bit fixnum tags, move-to-word/integer can be done in 4 or 5 instructions (including the initial move) versus 7 instructions.

fixnump/signed-byte-64 can be done without use of a constant, sometimes just 1 instruction, plus the conditional jump or move.

Also fixnump/unsigned-byte-64 could emit 'mov rdx,rdx' or similar because it used (inst mov tmp value) where it meant (move tmp value).

[Paul Khuong]

Committed in 6794373 (More efficient integer=>word conversion and
fixnump tests on x86-64)

Thank you,

Paul Khuong

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