Wei Mi a88bbf0e22 [ConstHoisting] Add BFI in constanthoisting pass and select the best insertion ...

places based on it.

Existing constant hoisting pass will merge a group of contants in a small range
and hoist the const materialization code to the common dominator of their uses.
However, if the uses are all in cold pathes, existing implementation may hoist
the materialization code from cold pathes to a hot place. This may hurt performance.
The patch introduces BFI to the pass and selects the best insertion places based
on it.

The change is controlled by an option consthoist-with-block-frequency which is
off by default for now.

Differential Revision: https://reviews.llvm.org/D28962


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300989 91177308-0d34-0410-b5e6-96231b3b80d8

2017-04-21 15:50:16 +00:00

..

AArch64

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

ARM

This implements a more optimal algorithm for selecting a base constant in

2016-07-14 07:44:20 +00:00

PowerPC

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

X86

[ConstHoisting] Add BFI in constanthoisting pass and select the best insertion

2017-04-21 15:50:16 +00:00