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From: Tony Kelman <tony AT kelman DOT net>
To: JonY <10walls AT gmail DOT com>, "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: Re: [ANNOUNCEMENT] Updated: mingw64-*-gcc-5.4.0-2 (x86/x86_64)
Date: Tue, 21 Feb 2017 14:45:01 +0000
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> Do you have a small test case for this instead of running the entire
> test suite? I'm not sure how much time the full test suite takes.

Don't have a small test case, but I do have a big one. I've been
verifying that the patch helps in cross-compiles from opensuse
where it's a lot faster to build a patched gcc (and the test case)
than in cygwin.

Large test case (takes about 15 minutes on my year-old laptop):

curl -L http://llvm.org/releases/3.7.1/llvm-3.7.1.src.tar.xz | tar -xJf -
mkdir -p llvmbuild/bin
cd llvmbuild
echo 'set(CMAKE_C_COMPILER gcc)' > NATIVE.cmake
echo 'set(CMAKE_CXX_COMPILER g++)' >> NATIVE.cmake
cp /usr/i686-w64-mingw32/sys-root/mingw/bin/*.dll bin
cmake ../llvm-3.7.1.src -DCMAKE_SYSTEM_NAME=Windows \
  -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD=host \
  -DCMAKE_C_COMPILER=i686-w64-mingw32-gcc \
  -DCMAKE_CXX_COMPILER=i686-w64-mingw32-g++ \
  -DCROSS_TOOLCHAIN_FLAGS_NATIVE=-DCMAKE_TOOLCHAIN_FILE=$PWD/NATIVE.cmake
make -j`nproc` opt
bin/opt.exe -slp-vectorizer \
  -S ../llvm-3.7.1.src/test/Transforms/SLPVectorizer/X86/vector.ll


That'll give the following sane LLVM IR output on gcc 4.9, or crash on
unpatched 5+.

; ModuleID = '../llvm-3.7.1.src/test/Transforms/SLPVectorizer/X86/vector.ll'
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.8.0"

define void @test(<4 x i32> %in, <4 x i32> %in2) {
  %k = icmp eq <4 x i32> %in, %in2
  ret void
}


> I'll to include the update in the next 5.x release.

Thanks! We're mainly trying to double-check that the patch doesn't
introduce any regressions, cause more problems than it solves.

-Tony

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