X87: [builtins] Introduce proper Float64Log1p operator.

X87: [builtins] Introduce proper Float64Log1p operator.

  port 7ceed92ac036d6b4e402d76a5cea130a3c4cfbf1 (r36914)

  original commit message:
  Import base::ieee754::log1p() from fdlibm and introduce a Float64Log1p
  TurboFan operator based on that, similar to what we do for Float64Log.
  Rewrite Math.log1p() as TurboFan builtin and use that operator to also
  inline Math.log1p() into optimized TurboFan functions.

  Also unify the handling of the special IEEE 754 functions somewhat in
  the TurboFan backends. At some point we can hopefully express this
  completely in the InstructionSelector (once we have an idea what to do
  with the ST(0) return issue on IA-32/X87).

BUG=

  Drive-by-fix: Add some more test coverage for the log function.
Committed: https://crrev.com/196a0d3a64fe8f3ccc547e183b782c15076dce83
Cr-Commit-Position: refs/heads/master@{#37255}

[zhengxing.li, 2016-06-24 10:44:33]

zhengxing.li@intel.com changed reviewers:
+ bmeurer@chromium.org, chunyang.dai@intel.com, weiliang.lin@intel.com

[zhengxing.li, 2016-06-24 10:44:34]

PTAL, thanks!

[Weiliang, 2016-06-24 13:00:54]

lgtm

[zhengxing.li, 2016-06-24 14:59:59]

The CQ bit was checked by zhengxing.li@intel.com

[commit-bot: I haz the power, 2016-06-24 15:00:12]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-06-24 15:23:08]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-24 15:23:59]

Description was changed from

==========
X87: [builtins] Introduce proper Float64Log1p operator.

  port 7ceed92ac036d6b4e402d76a5cea130a3c4cfbf1 (r36914)

  original commit message:
  Import base::ieee754::log1p() from fdlibm and introduce a Float64Log1p
  TurboFan operator based on that, similar to what we do for Float64Log.
  Rewrite Math.log1p() as TurboFan builtin and use that operator to also
  inline Math.log1p() into optimized TurboFan functions.

  Also unify the handling of the special IEEE 754 functions somewhat in
  the TurboFan backends. At some point we can hopefully express this
  completely in the InstructionSelector (once we have an idea what to do
  with the ST(0) return issue on IA-32/X87).

BUG=

  Drive-by-fix: Add some more test coverage for the log function.
==========

to

==========
X87: [builtins] Introduce proper Float64Log1p operator.

  port 7ceed92ac036d6b4e402d76a5cea130a3c4cfbf1 (r36914)

  original commit message:
  Import base::ieee754::log1p() from fdlibm and introduce a Float64Log1p
  TurboFan operator based on that, similar to what we do for Float64Log.
  Rewrite Math.log1p() as TurboFan builtin and use that operator to also
  inline Math.log1p() into optimized TurboFan functions.

  Also unify the handling of the special IEEE 754 functions somewhat in
  the TurboFan backends. At some point we can hopefully express this
  completely in the InstructionSelector (once we have an idea what to do
  with the ST(0) return issue on IA-32/X87).

BUG=

  Drive-by-fix: Add some more test coverage for the log function.
Committed: https://crrev.com/196a0d3a64fe8f3ccc547e183b782c15076dce83
Cr-Commit-Position: refs/heads/master@{#37255}
==========

[commit-bot: I haz the power, 2016-06-24 15:24:00]

Patchset 1 (id:??) landed as
https://crrev.com/196a0d3a64fe8f3ccc547e183b782c15076dce83
Cr-Commit-Position: refs/heads/master@{#37255}