clang-p2996

Files

Sanjay Patel f99d254aae [InstCombine] simplify min/max of min/max with same operands (PR35607)

This is the original integer variant requested in:
https://bugs.llvm.org/show_bug.cgi?id=35607

As noted in the TODO and several similar TODOs around this block,
we could do this in instsimplify, but then it would cost more
because we would be trying to match min/max via ValueTracking
in 2 different places.

There are 4 commuted variants for each of smin/smax/umin/umax
that are not matched here. There are also icmp predicate variants
that are not included in the affected test file because they are
already handled by instsimplify by folding the final icmp to
true/false.

https://rise4fun.com/Alive/3KVc

  Name: smax(smax, smin)
  %c1 = icmp slt i32 %x, %y
  %c2 = icmp slt i32 %y, %x
  %min = select i1 %c1, i32 %x, i32 %y
  %max = select i1 %c2, i32 %x, i32 %y
  %c3 = icmp sgt i32 %max, %min
  %r = select i1 %c3, i32 %max, i32 %min
  =>
  %r = %max

  Name: smin(smax, smin)
  %c1 = icmp slt i32 %x, %y
  %c2 = icmp slt i32 %y, %x
  %min = select i1 %c1, i32 %x, i32 %y
  %max = select i1 %c2, i32 %x, i32 %y
  %c3 = icmp sgt i32 %max, %min
  %r = select i1 %c3, i32 %min, i32 %max
  =>
  %r = %min

  Name: umax(umax, umin)
  %c1 = icmp ult i32 %x, %y
  %c2 = icmp ult i32 %y, %x
  %min = select i1 %c1, i32 %x, i32 %y
  %max = select i1 %c2, i32 %x, i32 %y
  %c3 = icmp ult i32 %min, %max
  %r = select i1 %c3, i32 %max, i32 %min
  =>
  %r = %max

  Name: umin(umax, umin)
  %c1 = icmp ult i32 %x, %y
  %c2 = icmp ult i32 %y, %x
  %min = select i1 %c1, i32 %x, i32 %y
  %max = select i1 %c2, i32 %x, i32 %y
  %c3 = icmp ult i32 %min, %max
  %r = select i1 %c3, i32 %min, i32 %max
  =>
  %r = %min

llvm-svn: 369386

2019-08-20 13:39:17 +00:00

benchmarks

…

bindings

Bump llvm-go to C++14

2019-08-15 10:55:25 +00:00

cmake

[CMake] Update C4324 MSVC warning comment to explain its still broken at VS2019

2019-08-20 11:20:05 +00:00

docs

[Docs] Test commit

2019-08-18 19:07:10 +00:00

examples

[ORC] Make sure we linker-mangle symbol names in the SpeculationLayer.

2019-08-18 21:29:57 +00:00

include

Regex: +regex string lifetime comment

2019-08-20 13:25:19 +00:00

lib

[InstCombine] simplify min/max of min/max with same operands (PR35607)

2019-08-20 13:39:17 +00:00

projects

[libc++] Take 2: Integrate the PSTL into libc++

2019-08-05 18:29:14 +00:00

resources

…

runtimes

…

test

[InstCombine] simplify min/max of min/max with same operands (PR35607)

2019-08-20 13:39:17 +00:00

tools

[llvm-objdump] - Remove one of report_error functions and improve the error reporting.

2019-08-20 13:19:16 +00:00

unittests

Recommit "MemoryBuffer: Add a missing error-check to getOpenFileImpl"

2019-08-20 12:08:52 +00:00

utils

[lit] Check for accidental external command calls

2019-08-19 22:59:37 +00:00

.arcconfig

…

.clang-format

…

.clang-tidy

…

.gitattributes

…

.gitignore

…

CMakeLists.txt

Add support in CMake to statically link the C++ standard library.

2019-08-14 19:55:59 +00:00

CODE_OWNERS.TXT

…

configure

…

CREDITS.TXT

…

LICENSE.TXT

…

llvm.spec.in

…

LLVMBuild.txt

…

README.txt

…

RELEASE_TESTERS.TXT

…

README.txt

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.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you are writing a package for LLVM, see docs/Packaging.rst for our
suggestions.