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3 Commits

Author SHA1 Message Date
Andrey Turetskiy
1f54774327 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



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257589 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-01-13 11:30:44 +00:00
Alexey Bataev
d5572b6d8d [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


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255881 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-12-17 07:34:39 +00:00
Alexey Bataev
a18156c3b8 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


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254712 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-12-04 10:53:15 +00:00