Hello!

Attached patch removes unnecessary mixed-mode log patterns. These are
not needed, because all x87 float_extend RTXes degenerate to a plain
move (or a no-op move). The patch also includes a couple of cleanups
with no functional changes.

2018-09-11  Uros Bizjak  <ubizjak@gmail.com>

    * config/i386/i386.md (fyl2x_extend<mode>xf3_i387): Remove.
    (log<mode>2): Change operand 1 predicate to general_operand.
    Extend operand 1 to XFmode and generate logxf3 insn.
    (log10<mode>2): Change operand 1 predicate to general_operand.
    Extend operand 1 to XFmode and generate log10xf3 insn.
    (log2<mode>2): Change operand 1 predicate to general_operand.
    Extend operand 1 to XFmode and generate log2xf3 insn.
    (fyl2xp1_extend<mode>xf3_i387): Remove.
    (log1p<mode>2): Change operand 1 predicate to general_operand.
    Extend operand 1 to XFmode and generate log1pxf3 insn.
    (fxtract_extend<mode>xf3_i387): Remove.
    (logb<mode>2): Change operand 1 predicate to general_operand.
    Extend operand 1 to XFmode and generate logbxf3 insn.
    (ilogb<mode>2): Change operand 1 predicate to general_operand.
    Extend operand 1 to XFmode and generate fxtractxf3_i387 insn.
    (significand<mode>2): Change operand 1 predicate to general_operand.
    Extend operand 1 to XFmode and generate significandxf3 insn.

Patch was bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Committed to mainline SVN.

Uros.