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Author SHA1 Message Date
Andrey Turetskiy 9994b8894a [X86] Enable the LEA optimization pass by default. 
Differential Revision: http://reviews.llvm.org/D16877

llvm-svn: 261429
 2016-02-20 11:11:55 +00:00
Andrey Turetskiy 0babd26626 [X86] PR26575: Fix LEA optimization pass (Part 2). 
Handle address displacement operands of a type other than Immediate or Global in LEAs and load/stores.

Ref: https://llvm.org/bugs/show_bug.cgi?id=26575

Differential Revision: http://reviews.llvm.org/D17374

llvm-svn: 261428
 2016-02-20 10:58:28 +00:00
Hans Wennborg 84047896b9 Revert r260979 "[X86] Enable the LEA optimization pass by default." 
Asserts are still firing in Chromium builds. PR26575.

llvm-svn: 261058
 2016-02-17 02:49:59 +00:00
Andrey Turetskiy eab4e68650 [X86] Enable the LEA optimization pass by default. 
Differential Revision: http://reviews.llvm.org/D16877

llvm-svn: 260979
 2016-02-16 16:41:38 +00:00
Andrey Turetskiy 1052ac2311 [X86] PR26575: Fix LEA optimization pass. 
Add a missing check for a type of address displacement operand of the load/store instruction being a candidate for LEA substitution.

Ref: https://llvm.org/bugs/show_bug.cgi?id=26575

Differential Revision: http://reviews.llvm.org/D17261

llvm-svn: 260959
 2016-02-16 12:47:45 +00:00
Hans Wennborg 75fab7b0b0 Revert r260507: "[X86] Enable the LEA optimization pass by default." 
This caused PR26575.

llvm-svn: 260538
 2016-02-11 16:44:06 +00:00
Andrey Turetskiy 193956e25f [X86] Enable the LEA optimization pass by default. 
Differential Revision: http://reviews.llvm.org/D16877

llvm-svn: 260507
 2016-02-11 10:51:26 +00:00
Andrey Turetskiy bca0f99224 [X86] Use hash table in LEA optimization pass. 
Use hash table (key is a memory operand) to store found LEA instructions to reduce compile time.

Differential Revision: http://reviews.llvm.org/D16404

llvm-svn: 259770
 2016-02-04 08:57:03 +00:00
Andrey Turetskiy 1ce2c9973f LEA code size optimization pass (Part 2): Remove redundant LEA instructions. 
Make x86 OptimizeLEAs pass remove LEA instruction if there is another LEA
(in the same basic block) which calculates address differing only be a
displacement. Works only for -Oz.

Differential Revision: http://reviews.llvm.org/D13295

llvm-svn: 257589
 2016-01-13 11:30:44 +00:00
Alexey Bataev 28f0c5efec [X86] Reduce complexity of the LEA optimization pass, by Andrey Turetsky. 
In the OptimizeLEA pass keep instructions' positions in the basic block saved and use them for calculation of the distance between two instructions instead of std::distance. This reduces complexity of the pass from O(n^3) to O(n^2) and thus the compile time.
Differential Revision: http://reviews.llvm.org/D15692

llvm-svn: 257328
 2016-01-11 11:52:29 +00:00
Alexey Bataev 7b72b658cc [X86] Add option for enabling LEA optimization pass, by Andrey Turetsky 
Add option to enable/disable LEA optimization pass. By default the pass is disabled.
Differential Revision: http://reviews.llvm.org/D15573

llvm-svn: 255881
 2015-12-17 07:34:39 +00:00
Sanjay Patel f9bdb872bd remove redundant check: optForSize() includes a check for the minsize attribute; NFCI 
llvm-svn: 254925
 2015-12-07 19:13:40 +00:00
Alexey Bataev 7cf324772f LEA code size optimization pass (Part 1): Remove redundant address recalculations, by Andrey Turetsky 
Add new x86 pass which replaces address calculations in load or store instructions with def register of existing LEA (must be in the same basic block), if the LEA calculates address that differs only by a displacement. Works only with -Os or -Oz.
Differential Revision: http://reviews.llvm.org/D13294

llvm-svn: 254712
 2015-12-04 10:53:15 +00:00