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Orlando Cazalet-Hyams 78a6062c24 [DebugInfo@O2][LoopVectorize] pr39024: Vectorized code linenos step through loop even after completion 
Summary:
Bug: https://bugs.llvm.org/show_bug.cgi?id=39024

The bug reports that a vectorized loop is stepped through 4 times and each step through the loop seemed to show a different path. I found two problems here:

A) An incorrect line number on a preheader block (for.body.preheader) instruction causes a step into the loop before it begins.
B) Instructions in the middle block have different line numbers which give the impression of another iteration.

In this patch I give all of the middle block instructions the line number of the scalar loop latch terminator branch. This seems to provide the smoothest debugging experience because the vectorized loops will always end on this line before dropping into the scalar loop. To solve problem A I have altered llvm::SplitBlockPredecessors to accommodate loop header blocks.

Reviewers: samsonov, vsk, aprantl, probinson, anemet, hfinkel

Reviewed By: hfinkel

Subscribers: bjope, jmellorcrummey, hfinkel, gbedwell, hiraditya, zzheng, llvm-commits

Tags: #llvm, #debug-info

Differential Revision: https://reviews.llvm.org/D60831

llvm-svn: 360162
 		2019-05-07 15:37:38 +00:00
clang [ASTImporter] Corrected type of integer constant in a test. 2019-05-07 14:53:04 +00:00
clang-tools-extra [clangd] Introduce intermediate representation of formatted text 2019-05-07 14:18:18 +00:00
compiler-rt [libFuzzer] Increase timeouts on fork tests and skip one on aarch64 2019-05-07 09:31:14 +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 Remove unneeded <algorithm> include in cmath. 2019-05-06 23:14:31 +00:00
libcxxabi minor cmake formatting style fix 2019-05-07 13:14:14 +00:00
libunwind [gn] Support for building libunwind 2019-05-02 17:29:37 +00:00
lld lld-link: Allow /? as option prefix, like -? is allowed 2019-05-07 14:15:35 +00:00
lldb Added missing files from 360071. 2019-05-07 15:37:28 +00:00
llgo IR: Support parsing numeric block ids, and emit them in textual output. 2019-03-22 18:27:13 +00:00
llvm [DebugInfo@O2][LoopVectorize] pr39024: Vectorized code linenos step through loop even after completion 2019-05-07 15:37:38 +00:00
openmp Add non-SSE wrapper for __kmp_{load,store}_mxcsr 2019-05-06 17:58:03 +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 [pstl] Make the default backend be the serial backend and always provide parallel policies 2019-04-24 20:12:36 +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.