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4 Commits

Author SHA1 Message Date
Peter Collingbourne 10c500ddc0 opt: Rename -default-data-layout flag to -data-layout and make it always override the layout. 
There isn't much point in a flag that only works if the data layout is empty.

Differential Revision: https://reviews.llvm.org/D30014

llvm-svn: 295468
 2017-02-17 17:36:52 +00:00
Artur Pilipenko b6ce6e5dac Don't look through addrspacecast in GetPointerBaseWithConstantOffset 
Pointers in different addrspaces can have different sizes, so it's not valid to look through addrspace cast calculating base and offset for a value.

This is similar to D13008.

Reviewed By: reames

Differential Revision: https://reviews.llvm.org/D24729

llvm-svn: 282612
 2016-09-28 17:57:16 +00:00
Dehao Chen 22ce5eb051 Do not widen load for different variable in GVN. 
Summary:
Widening load in GVN is too early because it will block other optimizations like PRE, LICM.

https://llvm.org/bugs/show_bug.cgi?id=29110

The SPECCPU2006 benchmark impact of this patch:

Reference: o2_nopatch
(1): o2_patched

           Benchmark             Base:Reference   (1)  
-------------------------------------------------------
spec/2006/fp/C++/444.namd                  25.2  -0.08%
spec/2006/fp/C++/447.dealII               45.92  +1.05%
spec/2006/fp/C++/450.soplex                41.7  -0.26%
spec/2006/fp/C++/453.povray               35.65  +1.68%
spec/2006/fp/C/433.milc                   23.79  +0.42%
spec/2006/fp/C/470.lbm                    41.88  -1.12%
spec/2006/fp/C/482.sphinx3                47.94  +1.67%
spec/2006/int/C++/471.omnetpp             22.46  -0.36%
spec/2006/int/C++/473.astar               21.19  +0.24%
spec/2006/int/C++/483.xalancbmk           36.09  -0.11%
spec/2006/int/C/400.perlbench             33.28  +1.35%
spec/2006/int/C/401.bzip2                 22.76  -0.04%
spec/2006/int/C/403.gcc                   32.36  +0.12%
spec/2006/int/C/429.mcf                   41.04  -0.41%
spec/2006/int/C/445.gobmk                 26.94  +0.04%
spec/2006/int/C/456.hmmer                  24.5  -0.20%
spec/2006/int/C/458.sjeng                    28  -0.46%
spec/2006/int/C/462.libquantum            55.25  +0.27%
spec/2006/int/C/464.h264ref               45.87  +0.72%

geometric mean                                   +0.23%

For most benchmarks, it's a wash, but we do see stable improvements on some benchmarks, e.g. 447,453,482,400.

Reviewers: davidxl, hfinkel, dberlin, sanjoy, reames

Subscribers: gberry, junbuml

Differential Revision: https://reviews.llvm.org/D24096

llvm-svn: 281074
 2016-09-09 18:42:35 +00:00
Davide Italiano ed8e0881c1 [GVN] Move the PRE/LOADPRE test in a subdirectory. 
llvm-svn: 275741
 2016-07-17 23:48:18 +00:00