Revert "This patch closes PR28513: an optimization of multiplication by different constants. It's implemented on DAG combiner level."
This reverts commit r304209.
I think this change is responsible for a tablgen failure in stage2 builds:
http://green.lab.llvm.org/green/job/clang-stage2-configure-Rthinlto_build/2171/
I reproduced the failure locally (without ThinLTO), reverted the commit, rebuilt the stage1 clang, rebuilt the stage2 llvm-tblgen tool, and found that the crash disappears when the commit is reverted. Here is the stack trace:
FAILED: lib/Target/ARM/ARMGenRegisterBank.inc.tmp
cd /Volumes/Builds/pz-master-stage2-RA/lib/Target/ARM && /Volumes/Builds/pz-master-stage2-RA/bin/llvm-tblgen -gen-register-bank -I /Users/vk/llvm/lib/Target/ARM -I /Users/vk/llvm/include -I /Users/vk/llvm/lib/Target /Users/vk/llvm/lib/Target/ARM/ARM.td -o /Volumes
/Builds/pz-master-stage2-RA/lib/Target/ARM/ARMGenRegisterBank.inc.tmp
0 llvm-tblgen 0x0000000106fc9568 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 40
1 llvm-tblgen 0x0000000106fc9be6 SignalHandler(int) + 422
2 libsystem_platform.dylib 0x00000001076a7fba _sigtramp + 26
3 libsystem_platform.dylib 0x00007fff58deb468 _sigtramp + 1366570184
4 llvm-tblgen 0x0000000106e89cc7 llvm::CodeGenRegBank::getCompositeSubRegIndex(llvm::CodeGenSubRegIndex*, llvm::CodeGenSubRegIndex*) + 615
5 llvm-tblgen 0x0000000106e88be6 llvm::CodeGenRegister::computeSubRegs(llvm::CodeGenRegBank&) + 2182
6 llvm-tblgen 0x0000000106e8e9f0 llvm::CodeGenRegBank::CodeGenRegBank(llvm::RecordKeeper&) + 2192
7 llvm-tblgen 0x0000000106f384a1 llvm::EmitRegisterBank(llvm::RecordKeeper&, llvm::raw_ostream&) + 65
8 llvm-tblgen 0x0000000106f72c64 (anonymous namespace)::LLVMTableGenMain(llvm::raw_ostream&, llvm::RecordKeeper&) + 1172
9 llvm-tblgen 0x0000000106fcb15f llvm::TableGenMain(char*, bool (*)(llvm::raw_ostream&, llvm::RecordKeeper&)) + 3599
10 llvm-tblgen 0x0000000106f727a6 main + 134
11 libdyld.dylib 0x000000010733c6a5 start + 1
Stack dump:
0. Program arguments: /Volumes/Builds/pz-master-stage2-RA/bin/llvm-tblgen -gen-register-bank -I /Users/vk/llvm/lib/Target/ARM -I /Users/vk/llvm/include -I /Users/vk/llvm/lib/Target /Users/vk/llvm/lib/Target/ARM/ARM.td -o /Volumes/Builds/pz-master-stage2-RA/lib/Target/ARM/ARMGenRegisterBank.inc.tmp
/bin/sh: line 1: 41986 Segmentation fault: 11 /Volumes/Builds/pz-master-stage2-RA/bin/llvm-tblgen -gen-register-bank -I /Users/vk/llvm/lib/Target/ARM -I /Users/vk/llvm/include -I /Users/vk/llvm/lib/Target /Users/vk/llvm/lib/Target/ARM/ARM.td -o /Volumes/Builds/pz
-master-stage2-RA/lib/Target/ARM/ARMGenRegisterBank.inc.tmp
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304231 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed