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Roman Lebedev b646dd92c2 [InstCombine] foldUnsignedUnderflowCheck(): handle last few cases (PR43251) 
Summary:
I don't have a direct motivational case for this,
but it would be good to have this for completeness/symmetry.

This pattern is basically the motivational pattern from
https://bugs.llvm.org/show_bug.cgi?id=43251
but with different predicate that requires that the offset is non-zero.

The completeness bit comes from the fact that a similar pattern (offset != zero)
will be needed for https://bugs.llvm.org/show_bug.cgi?id=43259,
so it'd seem to be good to not overlook very similar patterns..

Proofs: https://rise4fun.com/Alive/21b

Also, there is something odd with `isKnownNonZero()`, if the non-zero
knowledge was specified as an assumption, it didn't pick it up (PR43267)

With this, i see no other missing folds for
https://bugs.llvm.org/show_bug.cgi?id=43251

Reviewers: spatel, nikic, xbolva00

Reviewed By: spatel

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67412

llvm-svn: 372257
 		2019-09-18 20:10:07 +00:00
clang [OPENMP]Fix for PR43349: Crash for privatized loop bound. 2019-09-18 19:24:07 +00:00
clang-tools-extra [clang-tidy] Fix a potential infinite loop in readability-isolate-declaration check. 2019-09-18 09:21:35 +00:00
compiler-rt tsan: allow the Go runtime to return multiple stack frames for a single PC 2019-09-18 09:18:04 +00:00
debuginfo-tests Make nrvo-string test more robust. 2019-06-27 20:38:37 +00:00
libc Add a director, along with README.txt and LICENSE.txt, for libc. 2019-09-16 21:39:08 +00:00
libclc Revert "Rename F_{None,Text,Append} to OF_{None,Text,Append}. NFC" 2019-08-05 17:23:23 +00:00
libcxx Revert "Revert "Implement std::condition_variable via pthread_cond_clockwait() where available"" 2019-09-18 18:13:32 +00:00
libcxxabi Update XFAIL list for new GCC versions 2019-09-13 18:43:29 +00:00
libunwind unwind: remove a could of extraneous `else` (NFC) 2019-09-18 16:15:56 +00:00
lld [ELF][AARCH64] Refactor AArchErrataFix to match changes in ARMErrataFix NFC. 2019-09-17 09:49:30 +00:00
lldb Fir TestAPILog for gcc 2019-09-18 13:41:50 +00:00
llgo IR: Support parsing numeric block ids, and emit them in textual output. 2019-03-22 18:27:13 +00:00
llvm [InstCombine] foldUnsignedUnderflowCheck(): handle last few cases (PR43251) 2019-09-18 20:10:07 +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 [CodeGen] Handle outlining of CopyStmts. 2019-09-17 22:59:43 +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.