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Alina Sbirlea 2312a06c87 [SCEV] Add option to forget everything in SCEV. 
Summary:
Create a method to forget everything in SCEV.
Add a cl::opt and PassManagerBuilder option to use this in LoopUnroll.

Motivation: Certain Halide applications spend a very long time compiling in forgetLoop, and prefer to forget everything and rebuild SCEV from scratch.
Sample difference in compile time reduction: 21.04 to 14.78 using current ToT release build.
Testcase showcasing this cannot be opensourced and is fairly large.

The option disabled by default, but it may be desirable to enable by
default. Evidence in favor (two difference runs on different days/ToT state):

File Before (s) After (s)
clang-9.bc 7267.91 6639.14
llvm-as.bc 194.12 194.12
llvm-dis.bc 62.50 62.50
opt.bc 1855.85 1857.53

File Before (s) After (s)
clang-9.bc 8588.70 7812.83
llvm-as.bc 196.20 194.78
llvm-dis.bc 61.55 61.97
opt.bc 1739.78 1886.26

Reviewers: sanjoy

Subscribers: mehdi_amini, jlebar, zzheng, javed.absar, dmgreen, jdoerfert, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60144

llvm-svn: 358304
 		2019-04-12 19:16:07 +00:00
clang [HIP] Use -mlink-builtin-bitcode to link device library 2019-04-12 16:23:31 +00:00
clang-tools-extra [clangd] Fix an overflow inside a test 2019-04-12 16:40:54 +00:00
compiler-rt [TSan][libdispatch] Fix failing test 2019-04-12 18:31:09 +00:00
debuginfo-tests Set config.lit_tools_dir, which is needed by lit.llvm.initialize. 2018-11-06 21:54:27 +00:00
libclc travis: Add LLVM-8 build 2019-03-27 21:28:31 +00:00
libcxx [libc++] Run back-deployment CI against previously-released libc++abi dylibs 2019-04-12 16:58:25 +00:00
libcxxabi Fix PR41465 - Use __builtin_mul_overflow instead of hand-rolled check. 2019-04-11 17:16:35 +00:00
libunwind [NFC] Move the export attribute after extern "C". 2019-04-12 18:34:19 +00:00
lld [ELF] Fix typo: .symtab_shndxr -> .symtab_shndx 2019-04-12 02:20:52 +00:00
lldb Fix compiler warning introduced by r358261 2019-04-12 13:48:01 +00:00
llgo IR: Support parsing numeric block ids, and emit them in textual output. 2019-03-22 18:27:13 +00:00
llvm [SCEV] Add option to forget everything in SCEV. 2019-04-12 19:16:07 +00:00
openmp Fixed possible out of bound array access. 2019-04-11 15:03:44 +00:00
parallel-libs Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
polly Apply include-what-you-use #include removal suggestions. NFC. 2019-03-28 20:19:49 +00:00
pstl [NFC] Add explicit return from main() in tests 2019-04-12 18:38:58 +00:00
.arcconfig Update monorepo .arcconfig with new project callsign. 2019-01-31 14:34:59 +00:00
.clang-format Add .clang-tidy and .clang-format files to the toplevel of the 2019-01-29 16:43:16 +00:00
.clang-tidy Disable tidy checks with too many hits 2019-02-01 11:20:13 +00:00
.gitignore Add a reduced copy of the llvm .gitignore 2019-04-09 00:52:49 +00:00
README.md
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README.md

The LLVM Compiler Infrastructure

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.