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Nikita Popov fdc6977ff3 [LVI] Look through extractvalue of insertvalue 
This addresses the issue mentioned on D19867. When we simplify
with.overflow instructions in CVP, we leave behind extractvalue
of insertvalue sequences that LVI no longer understands. This
means that we can not simplify any instructions based on the
with.overflow anymore (until some over pass like InstCombine
cleans them up).

This patch extends LVI extractvalue handling by calling
SimplifyExtractValueInst (which doesn't do anything more than
constant folding + looking through insertvalue) and using the block
value of the simplification.

A possible alternative would be to do something similar to
SimplifyIndVars, where we instead directly try to replace
extractvalue users of the with.overflow. This would need some
additional structural changes to CVP, as it's currently not legal
to remove anything but the current instruction -- we'd have to
introduce a worklist with instructions scheduled for deletion or similar.

Differential Revision: https://reviews.llvm.org/D67035

llvm-svn: 371306
 		2019-09-07 12:03:59 +00:00
clang Remove stale TLI Module level pass registration 2019-09-07 03:09:46 +00:00
clang-tools-extra [clang][Index][NFC] Put IndexingOptions to a separate header 2019-09-06 20:08:32 +00:00
compiler-rt Revert "Revert "[builtins] Rounding mode support for addxf3/subxf3"" 2019-09-05 01:05:05 +00:00
debuginfo-tests Make nrvo-string test more robust. 2019-06-27 20:38:37 +00:00
libclc Revert "Rename F_{None,Text,Append} to OF_{None,Text,Append}. NFC" 2019-08-05 17:23:23 +00:00
libcxx Add gdb pretty printers for a wide variety of libc++ data structures (take 2). 2019-09-05 21:35:05 +00:00
libcxxabi Synchronize LLVM's copy of libc++abi's demangler with the libc++abi 2019-09-07 00:11:53 +00:00
libunwind [runtimes] Don't depend on libpthread on Android 2019-07-22 20:41:03 +00:00
lld [ELF][test] Improve tests 2019-09-07 10:42:11 +00:00
lldb Long timeouts for the MacOSX SystemRuntime plugins under ASAN; else quick. 2019-09-07 01:38:37 +00:00
llgo IR: Support parsing numeric block ids, and emit them in textual output. 2019-03-22 18:27:13 +00:00
llvm [LVI] Look through extractvalue of insertvalue 2019-09-07 12:03:59 +00:00
openmp [OpenMP] Change initialization of __kmp_global 2019-09-04 17:47:37 +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 [DependenceInfo] Compute WAR dependence info using ISL kills. NFC. 2019-08-29 18:55:55 +00:00
pstl [pstl] Allow customizing whether per-TU insulation is provided 2019-08-13 12:49:00 +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
.git-blame-ignore-revs Add LLDB reformatting to .git-blame-ignore-revs 2019-09-04 09:31:55 +00:00
.gitignore Add a newline at the end of the file 2019-09-04 06:33:46 +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.