Dehao Chen 961ef79d43 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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281074 91177308-0d34-0410-b5e6-96231b3b80d8		2016-09-09 18:42:35 +00:00
..
2009-02-17-LoadPRECrash.ll
2009-06-17-InvalidPRE.ll
2011-06-01-NonLocalMemdepMiscompile.ll
atomic.ll
invariant-load.ll
load-metadata.ll
load-pre-align.ll
load-pre-licm.ll
load-pre-nonlocal.ll	Do not widen load for different variable in GVN.	2016-09-09 18:42:35 +00:00
local-pre.ll
lpre-call-wrap-2.ll
lpre-call-wrap.ll
phi-translate.ll
pre-basic-add.ll
pre-gep-load.ll
pre-load.ll
pre-no-cost-phi.ll
pre-single-pred.ll
preserve-tbaa.ll
rle-phi-translate.ll
rle-semidominated.ll
rle.ll	Do not widen load for different variable in GVN.	2016-09-09 18:42:35 +00:00
volatile.ll