[SelectionDAG][RISCV] Add very basic PromoteIntegerResult/Op support for VP_SIGN/ZERO_EXTEND.

[craig.topper]

Summary

We don't have VP_ANY_EXTEND or VP_SIGN_EXTEND_INREG yet so I've
deviated a little from the non-VP lowering.

My goal was to fix the crashes that occurs on these test cases without this patch.

[craig.topper]

Add PromoteIntegerResult as well.

[fakepaper56]

LGTM.

[frasercrmck]

llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp

781

This could maybe do with a comment - I notice the code below has Otherwise, just extend the original operand .... Does this apply here too?

[craig.topper]

Move a comment and update another comment to mention excluding VP_*_EXTEND.

[asb]

LGTM.

[ayzhao]

This is causing Chrome debug builds on Linux to fail (https://crbug.com/1455144)

clang++: /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp:780: llvm::SDValue llvm::DAGTypeLegalizer::PromoteIntRes_INT_EXTEND(llvm::SDNode *): Assertion `N->getNumOperands() == 3 && "Unexpected number of operands!"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: /usr/local/google/home/ayzhao/src/llvm-project/build/bin/clang++ -MMD -MF obj/third_party/swiftshader/third_party/llvm-10.0/swiftshader_llvm_most/CodeViewDebug.o.d -DDCHECK_ALWAYS_ON=1 -DUSE_UDEV -DUSE_AURA=1 -DUSE_GLIB=1 -DUSE_OZONE=1 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_GNU_SOURCE -D_LIBCPP_ENABLE_ASSERTIONS=1 -DCOMPONENT_BUILD -DCR_LIBCXX_REVISION=055b2e17ae4f0e2c025ad0c7508b01787df17758 -DCR_SYSROOT_KEY=20230611T210420Z-1 -D_DEBUG -DDYNAMIC_ANNOTATIONS_ENABLED=1 -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS -I../../third_party/swiftshader/third_party/llvm-10.0/llvm/include -I../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/Target/AArch64 -I../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/Target/ARM -I../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/Target/Mips -I../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/Target/PowerPC -I../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/Target/RISCV -I../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/Target/X86 -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/include -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/IR -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/Target/AArch64 -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/Target/ARM -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/Target/Mips -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/Target/PowerPC -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/Target/RISCV -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/Target/X86 -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/Transforms/InstCombine -I../../third_party/swiftshader/third_party/llvm-10.0/configs/linux/include -I../.. -Igen -I../../buildtools/third_party/libc++ -fno-delete-null-pointer-checks -fno-ident -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -funwind-tables -fPIC -pthread -fcolor-diagnostics -fmerge-all-constants -fcrash-diagnostics-dir=../../tools/clang/crashreports -mllvm -instcombine-lower-dbg-declare=0 -ffp-contract=off -fcomplete-member-pointers -m64 -msse3 -Wno-builtin-macro-redefined -D__DATE__= -D__TIME__= -D__TIMESTAMP__= -ffile-compilation-dir=. -no-canonical-prefixes -ftrivial-auto-var-init=pattern -fno-omit-frame-pointer -gdwarf-4 -g2 -gdwarf-aranges -gsplit-dwarf -ggnu-pubnames -Xclang -fuse-ctor-homing -fvisibility=hidden -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -O2 -fdata-sections -ffunction-sections -fno-unique-section-names -Werror -Wall -Wno-unused-variable -Wno-c++11-narrowing -Wno-unused-but-set-variable -Wno-misleading-indentation -Wno-missing-field-initializers -Wno-unused-parameter -Wno-psabi -Wloop-analysis -Wno-unneeded-internal-declaration -Wenum-compare-conditional -Wno-ignored-pragma-optimize -Wno-deprecated-builtins -Wno-bitfield-constant-conversion -Wno-deprecated-this-capture -Wno-builtin-macro-redefined -Wno-shadow -Wno-attributes -Wno-bitwise-instead-of-logical -Wno-deprecated-declarations -Wno-enum-compare -Wno-header-hygiene -Wno-unused-function -Wno-unused-local-typedef -Wno-unused-private-field -Wno-unused-result -Wno-unused-variable -Wno-undefined-bool-conversion -Wno-tautological-undefined-compare -std=c++20 -Wno-trigraphs -gsimple-template-names -fno-exceptions -fno-rtti -nostdinc++ -isystem../../buildtools/third_party/libc++/trunk/include -isystem../../buildtools/third_party/libc++abi/trunk/include --sysroot=../../build/linux/debian_bullseye_amd64-sysroot -fvisibility-inlines-hidden -c ../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp -o obj/third_party/swiftshader/third_party/llvm-10.0/swiftshader_llvm_most/CodeViewDebug.o
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module '../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp'.
4.      Running pass 'X86 DAG->DAG Instruction Selection' on function '@_ZN4llvm13CodeViewDebug17createDefRangeMemEti'
 #0 0x0000564dc408c4fd llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Support/Unix/Signals.inc:602:11
 #1 0x0000564dc408c99b PrintStackTraceSignalHandler(void*) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Support/Unix/Signals.inc:675:1
 #2 0x0000564dc408ac16 llvm::sys::RunSignalHandlers() /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Support/Signals.cpp:104:5
 #3 0x0000564dc408bd6e llvm::sys::CleanupOnSignal(unsigned long) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Support/Unix/Signals.inc:368:1
 #4 0x0000564dc3fc8884 (anonymous namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:0:7
 #5 0x0000564dc3fc8c42 CrashRecoverySignalHandler(int) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:391:1
 #6 0x00007fe04825af90 (/lib/x86_64-linux-gnu/libc.so.6+0x3bf90)
 #7 0x00007fe0482a9ccc __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
 #8 0x00007fe04825aef2 raise ./signal/../sysdeps/posix/raise.c:27:6
 #9 0x00007fe048245472 abort ./stdlib/abort.c:81:7
#10 0x00007fe048245395 _nl_load_domain ./intl/loadmsgcat.c:1177:9
#11 0x00007fe048253df2 (/lib/x86_64-linux-gnu/libc.so.6+0x34df2)
#12 0x0000564dc5bf00aa llvm::DAGTypeLegalizer::PromoteIntRes_INT_EXTEND(llvm::SDNode*) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp:781:5
#13 0x0000564dc5be599e llvm::DAGTypeLegalizer::PromoteIntegerResult(llvm::SDNode*, unsigned int) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp:147:32
#14 0x0000564dc5b33f6f llvm::DAGTypeLegalizer::run() /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp:263:17
#15 0x0000564dc5b38adb llvm::SelectionDAG::LegalizeTypes() /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp:1059:34
#16 0x0000564dc5a92684 llvm::SelectionDAGISel::CodeGenAndEmitDAG() /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:807:13
#17 0x0000564dc5a91fed llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, true, false, void>, false, true>, llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, true, false, void>, false, true>, bool&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:702:1
#18 0x0000564dc5a91a24 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1705:11
#19 0x0000564dc5a8ef4a llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:482:3
#20 0x0000564dc1d07eea (anonymous namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp:192:7
#21 0x0000564dc3081d75 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/MachineFunctionPass.cpp:91:8
#22 0x0000564dc38f163a llvm::FPPassManager::runOnFunction(llvm::Function&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1435:23
#23 0x0000564dc38f6482 llvm::FPPassManager::runOnModule(llvm::Module&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1481:16
#24 0x0000564dc38f1ef9 (anonymous namespace)::MPPassManager::runOnModule(llvm::Module&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1550:23
#25 0x0000564dc38f1a6d llvm::legacy::PassManagerImpl::run(llvm::Module&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:535:16
#26 0x0000564dc38f6761 llvm::legacy::PassManager::run(llvm::Module&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1677:3
#27 0x0000564dc443b33a (anonymous namespace)::EmitAssemblyHelper::RunCodegenPipeline(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>&, std::unique_ptr<llvm::ToolOutputFile, std::default_delete<llvm::ToolOutputFile>>&) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/CodeGen/BackendUtil.cpp:1101:3
#28 0x0000564dc4435772 (anonymous namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/CodeGen/BackendUtil.cpp:1124:7
#29 0x0000564dc4434c37 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/CodeGen/BackendUtil.cpp:1283:3
#30 0x0000564dc5c34965 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/CodeGen/CodeGenAction.cpp:386:7
#31 0x0000564dc81faa03 clang::ParseAST(clang::Sema&, bool, bool) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Parse/ParseAST.cpp:183:12
#32 0x0000564dc5119ebc clang::ASTFrontendAction::ExecuteAction() /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Frontend/FrontendAction.cpp:1172:1
#33 0x0000564dc5c2ff84 clang::CodeGenAction::ExecuteAction() /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/CodeGen/CodeGenAction.cpp:1171:5
#34 0x0000564dc51198bc clang::FrontendAction::Execute() /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Frontend/FrontendAction.cpp:1064:7
#35 0x0000564dc5043918 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Frontend/CompilerInstance.cpp:1049:23
#36 0x0000564dc52e3207 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:264:8
#37 0x0000564dc1b71143 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) /usr/local/google/home/ayzhao/src/llvm-project/clang/tools/driver/cc1_main.cpp:249:13
#38 0x0000564dc1b5cb7a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) /usr/local/google/home/ayzhao/src/llvm-project/clang/tools/driver/driver.cpp:366:5
#39 0x0000564dc1b5e4ed clang_main(int, char**, llvm::ToolContext const&)::$_0::operator()(llvm::SmallVectorImpl<char const*>&) const /usr/local/google/home/ayzhao/src/llvm-project/clang/tools/driver/driver.cpp:506:7
#40 0x0000564dc1b5e4bd int llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::callback_fn<clang_main(int, char**, llvm::ToolContext const&)::$_0>(long, llvm::SmallVectorImpl<char const*>&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:45:5
#41 0x0000564dc4ee78c9 llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::operator()(llvm::SmallVectorImpl<char const*>&) const /usr/local/google/home/ayzhao/src/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:68:5
#42 0x0000564dc4ee4028 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::$_1::operator()() const /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Driver/Job.cpp:439:34
#43 0x0000564dc4ee3ff5 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::$_1>(long) /usr/local/google/home/ayzhao/src/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:45:5
#44 0x0000564dc2da9399 llvm::function_ref<void ()>::operator()() const /usr/local/google/home/ayzhao/src/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:68:5
#45 0x0000564dc3fc869a llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:427:3
#46 0x0000564dc4ee3947 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Driver/Job.cpp:439:7
#47 0x0000564dc4e7e37f clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Driver/Compilation.cpp:199:15
#48 0x0000564dc4e7e587 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Driver/Compilation.cpp:253:13
#49 0x0000564dc4e98f18 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Driver/Driver.cpp:1866:7
#50 0x0000564dc1b5c638 clang_main(int, char**, llvm::ToolContext const&) /usr/local/google/home/ayzhao/src/llvm-project/clang/tools/driver/driver.cpp:542:9
#51 0x0000564dc1b9493d main /usr/local/google/home/ayzhao/src/llvm-project/build/tools/clang/tools/driver/clang-driver.cpp:15:3
#52 0x00007fe04824618a __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#53 0x00007fe048246245 call_init ./csu/../csu/libc-start.c:128:20
#54 0x00007fe048246245 __libc_start_main ./csu/../csu/libc-start.c:368:5
#55 0x0000564dc1b5b2d1 _start (/usr/local/google/home/ayzhao/src/llvm-project/build/bin/clang+++0x1b242d1)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
clang version 17.0.0 ([e-mail]:llvm/llvm-project.git 6bf79fb09416b02b3f8589a4998610d70c185dae)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/google/home/ayzhao/src/llvm-project/build/bin
clang++: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: ../../tools/clang/crashreports/CodeViewDebug-8526b2.cpp
clang++: note: diagnostic msg: ../../tools/clang/crashreports/CodeViewDebug-8526b2.sh
clang++: note: diagnostic msg:

********************

CodeViewDebug-8526b2.cpp5 MBDownload

CodeViewDebug-8526b2.sh13 KBDownload

[craig.topper]

In D152854#4425455, @ayzhao wrote:

This is causing Chrome debug builds on Linux to fail (https://crbug.com/1455144)

clang++: /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp:780: llvm::SDValue llvm::DAGTypeLegalizer::PromoteIntRes_INT_EXTEND(llvm::SDNode *): Assertion `N->getNumOperands() == 3 && "Unexpected number of operands!"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: /usr/local/google/home/ayzhao/src/llvm-project/build/bin/clang++ -MMD -MF obj/third_party/swiftshader/third_party/llvm-10.0/swiftshader_llvm_most/CodeViewDebug.o.d -DDCHECK_ALWAYS_ON=1 -DUSE_UDEV -DUSE_AURA=1 -DUSE_GLIB=1 -DUSE_OZONE=1 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_GNU_SOURCE -D_LIBCPP_ENABLE_ASSERTIONS=1 -DCOMPONENT_BUILD -DCR_LIBCXX_REVISION=055b2e17ae4f0e2c025ad0c7508b01787df17758 -DCR_SYSROOT_KEY=20230611T210420Z-1 -D_DEBUG -DDYNAMIC_ANNOTATIONS_ENABLED=1 -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS -I../../third_party/swiftshader/third_party/llvm-10.0/llvm/include -I../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/Target/AArch64 -I../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/Target/ARM -I../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/Target/Mips -I../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/Target/PowerPC -I../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/Target/RISCV -I../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/Target/X86 -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/include -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/IR -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/Target/AArch64 -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/Target/ARM -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/Target/Mips -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/Target/PowerPC -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/Target/RISCV -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/Target/X86 -I../../third_party/swiftshader/third_party/llvm-10.0/configs/common/lib/Transforms/InstCombine -I../../third_party/swiftshader/third_party/llvm-10.0/configs/linux/include -I../.. -Igen -I../../buildtools/third_party/libc++ -fno-delete-null-pointer-checks -fno-ident -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -funwind-tables -fPIC -pthread -fcolor-diagnostics -fmerge-all-constants -fcrash-diagnostics-dir=../../tools/clang/crashreports -mllvm -instcombine-lower-dbg-declare=0 -ffp-contract=off -fcomplete-member-pointers -m64 -msse3 -Wno-builtin-macro-redefined -D__DATE__= -D__TIME__= -D__TIMESTAMP__= -ffile-compilation-dir=. -no-canonical-prefixes -ftrivial-auto-var-init=pattern -fno-omit-frame-pointer -gdwarf-4 -g2 -gdwarf-aranges -gsplit-dwarf -ggnu-pubnames -Xclang -fuse-ctor-homing -fvisibility=hidden -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -O2 -fdata-sections -ffunction-sections -fno-unique-section-names -Werror -Wall -Wno-unused-variable -Wno-c++11-narrowing -Wno-unused-but-set-variable -Wno-misleading-indentation -Wno-missing-field-initializers -Wno-unused-parameter -Wno-psabi -Wloop-analysis -Wno-unneeded-internal-declaration -Wenum-compare-conditional -Wno-ignored-pragma-optimize -Wno-deprecated-builtins -Wno-bitfield-constant-conversion -Wno-deprecated-this-capture -Wno-builtin-macro-redefined -Wno-shadow -Wno-attributes -Wno-bitwise-instead-of-logical -Wno-deprecated-declarations -Wno-enum-compare -Wno-header-hygiene -Wno-unused-function -Wno-unused-local-typedef -Wno-unused-private-field -Wno-unused-result -Wno-unused-variable -Wno-undefined-bool-conversion -Wno-tautological-undefined-compare -std=c++20 -Wno-trigraphs -gsimple-template-names -fno-exceptions -fno-rtti -nostdinc++ -isystem../../buildtools/third_party/libc++/trunk/include -isystem../../buildtools/third_party/libc++abi/trunk/include --sysroot=../../build/linux/debian_bullseye_amd64-sysroot -fvisibility-inlines-hidden -c ../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp -o obj/third_party/swiftshader/third_party/llvm-10.0/swiftshader_llvm_most/CodeViewDebug.o
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module '../../third_party/swiftshader/third_party/llvm-10.0/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp'.
4.      Running pass 'X86 DAG->DAG Instruction Selection' on function '@_ZN4llvm13CodeViewDebug17createDefRangeMemEti'
 #0 0x0000564dc408c4fd llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Support/Unix/Signals.inc:602:11
 #1 0x0000564dc408c99b PrintStackTraceSignalHandler(void*) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Support/Unix/Signals.inc:675:1
 #2 0x0000564dc408ac16 llvm::sys::RunSignalHandlers() /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Support/Signals.cpp:104:5
 #3 0x0000564dc408bd6e llvm::sys::CleanupOnSignal(unsigned long) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Support/Unix/Signals.inc:368:1
 #4 0x0000564dc3fc8884 (anonymous namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:0:7
 #5 0x0000564dc3fc8c42 CrashRecoverySignalHandler(int) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:391:1
 #6 0x00007fe04825af90 (/lib/x86_64-linux-gnu/libc.so.6+0x3bf90)
 #7 0x00007fe0482a9ccc __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
 #8 0x00007fe04825aef2 raise ./signal/../sysdeps/posix/raise.c:27:6
 #9 0x00007fe048245472 abort ./stdlib/abort.c:81:7
#10 0x00007fe048245395 _nl_load_domain ./intl/loadmsgcat.c:1177:9
#11 0x00007fe048253df2 (/lib/x86_64-linux-gnu/libc.so.6+0x34df2)
#12 0x0000564dc5bf00aa llvm::DAGTypeLegalizer::PromoteIntRes_INT_EXTEND(llvm::SDNode*) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp:781:5
#13 0x0000564dc5be599e llvm::DAGTypeLegalizer::PromoteIntegerResult(llvm::SDNode*, unsigned int) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp:147:32
#14 0x0000564dc5b33f6f llvm::DAGTypeLegalizer::run() /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp:263:17
#15 0x0000564dc5b38adb llvm::SelectionDAG::LegalizeTypes() /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp:1059:34
#16 0x0000564dc5a92684 llvm::SelectionDAGISel::CodeGenAndEmitDAG() /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:807:13
#17 0x0000564dc5a91fed llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, true, false, void>, false, true>, llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, true, false, void>, false, true>, bool&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:702:1
#18 0x0000564dc5a91a24 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1705:11
#19 0x0000564dc5a8ef4a llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:482:3
#20 0x0000564dc1d07eea (anonymous namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp:192:7
#21 0x0000564dc3081d75 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/CodeGen/MachineFunctionPass.cpp:91:8
#22 0x0000564dc38f163a llvm::FPPassManager::runOnFunction(llvm::Function&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1435:23
#23 0x0000564dc38f6482 llvm::FPPassManager::runOnModule(llvm::Module&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1481:16
#24 0x0000564dc38f1ef9 (anonymous namespace)::MPPassManager::runOnModule(llvm::Module&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1550:23
#25 0x0000564dc38f1a6d llvm::legacy::PassManagerImpl::run(llvm::Module&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:535:16
#26 0x0000564dc38f6761 llvm::legacy::PassManager::run(llvm::Module&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1677:3
#27 0x0000564dc443b33a (anonymous namespace)::EmitAssemblyHelper::RunCodegenPipeline(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>&, std::unique_ptr<llvm::ToolOutputFile, std::default_delete<llvm::ToolOutputFile>>&) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/CodeGen/BackendUtil.cpp:1101:3
#28 0x0000564dc4435772 (anonymous namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/CodeGen/BackendUtil.cpp:1124:7
#29 0x0000564dc4434c37 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/CodeGen/BackendUtil.cpp:1283:3
#30 0x0000564dc5c34965 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/CodeGen/CodeGenAction.cpp:386:7
#31 0x0000564dc81faa03 clang::ParseAST(clang::Sema&, bool, bool) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Parse/ParseAST.cpp:183:12
#32 0x0000564dc5119ebc clang::ASTFrontendAction::ExecuteAction() /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Frontend/FrontendAction.cpp:1172:1
#33 0x0000564dc5c2ff84 clang::CodeGenAction::ExecuteAction() /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/CodeGen/CodeGenAction.cpp:1171:5
#34 0x0000564dc51198bc clang::FrontendAction::Execute() /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Frontend/FrontendAction.cpp:1064:7
#35 0x0000564dc5043918 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Frontend/CompilerInstance.cpp:1049:23
#36 0x0000564dc52e3207 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:264:8
#37 0x0000564dc1b71143 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) /usr/local/google/home/ayzhao/src/llvm-project/clang/tools/driver/cc1_main.cpp:249:13
#38 0x0000564dc1b5cb7a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) /usr/local/google/home/ayzhao/src/llvm-project/clang/tools/driver/driver.cpp:366:5
#39 0x0000564dc1b5e4ed clang_main(int, char**, llvm::ToolContext const&)::$_0::operator()(llvm::SmallVectorImpl<char const*>&) const /usr/local/google/home/ayzhao/src/llvm-project/clang/tools/driver/driver.cpp:506:7
#40 0x0000564dc1b5e4bd int llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::callback_fn<clang_main(int, char**, llvm::ToolContext const&)::$_0>(long, llvm::SmallVectorImpl<char const*>&) /usr/local/google/home/ayzhao/src/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:45:5
#41 0x0000564dc4ee78c9 llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::operator()(llvm::SmallVectorImpl<char const*>&) const /usr/local/google/home/ayzhao/src/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:68:5
#42 0x0000564dc4ee4028 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::$_1::operator()() const /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Driver/Job.cpp:439:34
#43 0x0000564dc4ee3ff5 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::$_1>(long) /usr/local/google/home/ayzhao/src/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:45:5
#44 0x0000564dc2da9399 llvm::function_ref<void ()>::operator()() const /usr/local/google/home/ayzhao/src/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:68:5
#45 0x0000564dc3fc869a llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) /usr/local/google/home/ayzhao/src/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:427:3
#46 0x0000564dc4ee3947 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Driver/Job.cpp:439:7
#47 0x0000564dc4e7e37f clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Driver/Compilation.cpp:199:15
#48 0x0000564dc4e7e587 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Driver/Compilation.cpp:253:13
#49 0x0000564dc4e98f18 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) /usr/local/google/home/ayzhao/src/llvm-project/clang/lib/Driver/Driver.cpp:1866:7
#50 0x0000564dc1b5c638 clang_main(int, char**, llvm::ToolContext const&) /usr/local/google/home/ayzhao/src/llvm-project/clang/tools/driver/driver.cpp:542:9
#51 0x0000564dc1b9493d main /usr/local/google/home/ayzhao/src/llvm-project/build/tools/clang/tools/driver/clang-driver.cpp:15:3
#52 0x00007fe04824618a __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#53 0x00007fe048246245 call_init ./csu/../csu/libc-start.c:128:20
#54 0x00007fe048246245 __libc_start_main ./csu/../csu/libc-start.c:368:5
#55 0x0000564dc1b5b2d1 _start (/usr/local/google/home/ayzhao/src/llvm-project/build/bin/clang+++0x1b242d1)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
clang version 17.0.0 ([e-mail]:llvm/llvm-project.git 6bf79fb09416b02b3f8589a4998610d70c185dae)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/google/home/ayzhao/src/llvm-project/build/bin
clang++: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: ../../tools/clang/crashreports/CodeViewDebug-8526b2.cpp
clang++: note: diagnostic msg: ../../tools/clang/crashreports/CodeViewDebug-8526b2.sh
clang++: note: diagnostic msg:

********************

CodeViewDebug-8526b2.cpp5 MBDownload

CodeViewDebug-8526b2.sh13 KBDownload

It looks like an ISD::SIGN_EXTEND is being created somewhere with an error ValueType operand that it shouldn't have. That looks like an existing bug that my patch happened to catch.

llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp

case ISD::CONCAT_VECTORS:
                          Res = PromoteIntRes_CONCAT_VECTORS(N); break;
 
   case ISD::ANY_EXTEND_VECTOR_INREG:
   case ISD::SIGN_EXTEND_VECTOR_INREG:
   case ISD::ZERO_EXTEND_VECTOR_INREG:
                          Res = PromoteIntRes_EXTEND_VECTOR_INREG(N); break;
 
   case ISD::SIGN_EXTEND:
+  case ISD::VP_SIGN_EXTEND:
   case ISD::ZERO_EXTEND:
+  case ISD::VP_ZERO_EXTEND:
   case ISD::ANY_EXTEND:  Res = PromoteIntRes_INT_EXTEND(N); break;
 
   case ISD::VP_FP_TO_SINT:
   case ISD::VP_FP_TO_UINT:
   case ISD::STRICT_FP_TO_SINT:
   case ISD::STRICT_FP_TO_UINT:
   case ISD::FP_TO_SINT:
   case ISD::FP_TO_UINT:  Res = PromoteIntRes_FP_TO_XINT(N); break;
SDValue DAGTypeLegalizer::PromoteIntRes_INT_EXTEND(SDNode *N) {
   SDLoc dl(N);
 
   if (getTypeAction(N->getOperand(0).getValueType())
       == TargetLowering::TypePromoteInteger) {
     SDValue Res = GetPromotedInteger(N->getOperand(0));
     assert(Res.getValueType().bitsLE(NVT) && "Extension doesn't make sense!");
 
     // If the result and operand types are the same after promotion, simplify
-    // to an in-register extension.
-    if (NVT == Res.getValueType()) {
+    // to an in-register extension. Unless this is a VP_*_EXTEND.
+    if (NVT == Res.getValueType() && N->getNumOperands() == 1) {
       // The high bits are not guaranteed to be anything.  Insert an extend.
       if (N->getOpcode() == ISD::SIGN_EXTEND)
         return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, NVT, Res,
                            DAG.getValueType(N->getOperand(0).getValueType()));
       if (N->getOpcode() == ISD::ZERO_EXTEND)
         return DAG.getZeroExtendInReg(Res, dl, N->getOperand(0).getValueType());
       assert(N->getOpcode() == ISD::ANY_EXTEND && "Unknown integer extension!");
       return Res;
     }
   }
 
   // Otherwise, just extend the original operand all the way to the larger type.
+  if (N->getNumOperands() != 1) {
+    assert(N->getNumOperands() == 3 && "Unexpected number of operands!");
+    assert(N->isVPOpcode() && "Expected VP opcode");
+    return DAG.getNode(N->getOpcode(), dl, NVT, N->getOperand(0),
+                       N->getOperand(1), N->getOperand(2));
+  }
   return DAG.getNode(N->getOpcode(), dl, NVT, N->getOperand(0));
 }
 
 SDValue DAGTypeLegalizer::PromoteIntRes_LOAD(LoadSDNode *N) {
   assert(ISD::isUNINDEXEDLoad(N) && "Indexed load during type legalization!");
   EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
   ISD::LoadExtType ExtType =
     ISD::isNON_EXTLoad(N) ? ISD::EXTLOAD : N->getExtensionType();
case ISD::SCALAR_TO_VECTOR:
     Res = PromoteIntOp_ScalarOp(N);
     break;
   case ISD::VSELECT:
   case ISD::SELECT:       Res = PromoteIntOp_SELECT(N, OpNo); break;
   case ISD::SELECT_CC:    Res = PromoteIntOp_SELECT_CC(N, OpNo); break;
   case ISD::VP_SETCC:
   case ISD::SETCC:        Res = PromoteIntOp_SETCC(N, OpNo); break;
   case ISD::SIGN_EXTEND:  Res = PromoteIntOp_SIGN_EXTEND(N); break;
+  case ISD::VP_SIGN_EXTEND: Res = PromoteIntOp_VP_SIGN_EXTEND(N); break;
   case ISD::VP_SINT_TO_FP:
   case ISD::SINT_TO_FP:   Res = PromoteIntOp_SINT_TO_FP(N); break;
   case ISD::STRICT_SINT_TO_FP: Res = PromoteIntOp_STRICT_SINT_TO_FP(N); break;
   case ISD::STORE:        Res = PromoteIntOp_STORE(cast<StoreSDNode>(N),
                                                    OpNo); break;
   case ISD::MSTORE:       Res = PromoteIntOp_MSTORE(cast<MaskedStoreSDNode>(N),
                                                     OpNo); break;
   case ISD::MLOAD:        Res = PromoteIntOp_MLOAD(cast<MaskedLoadSDNode>(N),
                                                     OpNo); break;
   case ISD::MGATHER:  Res = PromoteIntOp_MGATHER(cast<MaskedGatherSDNode>(N),
                                                  OpNo); break;
   case ISD::MSCATTER: Res = PromoteIntOp_MSCATTER(cast<MaskedScatterSDNode>(N),
                                                   OpNo); break;
   case ISD::VP_TRUNCATE:
   case ISD::TRUNCATE:     Res = PromoteIntOp_TRUNCATE(N); break;
   case ISD::BF16_TO_FP:
   case ISD::FP16_TO_FP:
   case ISD::VP_UINT_TO_FP:
   case ISD::UINT_TO_FP:   Res = PromoteIntOp_UINT_TO_FP(N); break;
   case ISD::STRICT_UINT_TO_FP:  Res = PromoteIntOp_STRICT_UINT_TO_FP(N); break;
   case ISD::ZERO_EXTEND:  Res = PromoteIntOp_ZERO_EXTEND(N); break;
+  case ISD::VP_ZERO_EXTEND: Res = PromoteIntOp_VP_ZERO_EXTEND(N); break;
   case ISD::EXTRACT_SUBVECTOR: Res = PromoteIntOp_EXTRACT_SUBVECTOR(N); break;
   case ISD::INSERT_SUBVECTOR: Res = PromoteIntOp_INSERT_SUBVECTOR(N); break;
 
   case ISD::SHL:
   case ISD::SRA:
   case ISD::SRL:
   case ISD::ROTL:
   case ISD::ROTR: Res = PromoteIntOp_Shift(N); break;

 SDValue DAGTypeLegalizer::PromoteIntOp_SIGN_EXTEND(SDNode *N) {
   SDValue Op = GetPromotedInteger(N->getOperand(0));
   SDLoc dl(N);
   Op = DAG.getNode(ISD::ANY_EXTEND, dl, N->getValueType(0), Op);
   return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, Op.getValueType(),
                      Op, DAG.getValueType(N->getOperand(0).getValueType()));
 }
 
+SDValue DAGTypeLegalizer::PromoteIntOp_VP_SIGN_EXTEND(SDNode *N) {
+  SDLoc dl(N);
+  EVT VT = N->getValueType(0);
+  SDValue Op = GetPromotedInteger(N->getOperand(0));
+  // FIXME: There is no VP_ANY_EXTEND yet.
+  Op = DAG.getNode(ISD::VP_ZERO_EXTEND, dl, VT, Op, N->getOperand(1),
+                   N->getOperand(2));
+  unsigned Diff =
+      VT.getScalarSizeInBits() - N->getOperand(0).getScalarValueSizeInBits();
+  SDValue ShAmt = DAG.getShiftAmountConstant(Diff, VT, dl);
+  // FIXME: There is no VP_SIGN_EXTEND_INREG so use a pair of shifts.
+  SDValue Shl = DAG.getNode(ISD::VP_SHL, dl, VT, Op, ShAmt, N->getOperand(1),
+                            N->getOperand(2));
+  return DAG.getNode(ISD::VP_ASHR, dl, VT, Shl, ShAmt, N->getOperand(1),
+                     N->getOperand(2));
+}
+
 SDValue DAGTypeLegalizer::PromoteIntOp_SINT_TO_FP(SDNode *N) {
   if (N->getOpcode() == ISD::VP_SINT_TO_FP)
     return SDValue(DAG.UpdateNodeOperands(N,
                                           SExtPromotedInteger(N->getOperand(0)),
                                           N->getOperand(1), N->getOperand(2)),
                    0);
   return SDValue(DAG.UpdateNodeOperands(N,
                                 SExtPromotedInteger(N->getOperand(0))), 0);

 
 SDValue DAGTypeLegalizer::PromoteIntOp_ZERO_EXTEND(SDNode *N) {
   SDLoc dl(N);
   SDValue Op = GetPromotedInteger(N->getOperand(0));
   Op = DAG.getNode(ISD::ANY_EXTEND, dl, N->getValueType(0), Op);
   return DAG.getZeroExtendInReg(Op, dl, N->getOperand(0).getValueType());
 }
 
+SDValue DAGTypeLegalizer::PromoteIntOp_VP_ZERO_EXTEND(SDNode *N) {
+  SDLoc dl(N);
+  EVT VT = N->getValueType(0);
+  SDValue Op = GetPromotedInteger(N->getOperand(0));
+  // FIXME: There is no VP_ANY_EXTEND yet.
+  Op = DAG.getNode(ISD::VP_ZERO_EXTEND, dl, VT, Op, N->getOperand(1),
+                   N->getOperand(2));
+  APInt Imm = APInt::getLowBitsSet(VT.getScalarSizeInBits(),
+                                   N->getOperand(0).getScalarValueSizeInBits());
+  return DAG.getNode(ISD::VP_AND, dl, VT, Op, DAG.getConstant(Imm, dl, VT),
+                     N->getOperand(1), N->getOperand(2));
+}
+
 SDValue DAGTypeLegalizer::PromoteIntOp_ADDSUBO_CARRY(SDNode *N, unsigned OpNo) {
   assert(OpNo == 2 && "Don't know how to promote this operand!");
 
   SDValue LHS = N->getOperand(0);
   SDValue RHS = N->getOperand(1);
   SDValue Carry = N->getOperand(2);
   SDLoc DL(N);
 

llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h

private:
   SDValue PromoteIntOp_CONCAT_VECTORS(SDNode *N);
   SDValue PromoteIntOp_ScalarOp(SDNode *N);
   SDValue PromoteIntOp_SELECT(SDNode *N, unsigned OpNo);
   SDValue PromoteIntOp_SELECT_CC(SDNode *N, unsigned OpNo);
   SDValue PromoteIntOp_SETCC(SDNode *N, unsigned OpNo);
   SDValue PromoteIntOp_Shift(SDNode *N);
   SDValue PromoteIntOp_FunnelShift(SDNode *N);
   SDValue PromoteIntOp_SIGN_EXTEND(SDNode *N);
+  SDValue PromoteIntOp_VP_SIGN_EXTEND(SDNode *N);
   SDValue PromoteIntOp_SINT_TO_FP(SDNode *N);
   SDValue PromoteIntOp_STRICT_SINT_TO_FP(SDNode *N);
   SDValue PromoteIntOp_STORE(StoreSDNode *N, unsigned OpNo);
   SDValue PromoteIntOp_TRUNCATE(SDNode *N);
   SDValue PromoteIntOp_UINT_TO_FP(SDNode *N);
   SDValue PromoteIntOp_STRICT_UINT_TO_FP(SDNode *N);
   SDValue PromoteIntOp_ZERO_EXTEND(SDNode *N);
+  SDValue PromoteIntOp_VP_ZERO_EXTEND(SDNode *N);
   SDValue PromoteIntOp_MSTORE(MaskedStoreSDNode *N, unsigned OpNo);
   SDValue PromoteIntOp_MLOAD(MaskedLoadSDNode *N, unsigned OpNo);
   SDValue PromoteIntOp_MSCATTER(MaskedScatterSDNode *N, unsigned OpNo);
   SDValue PromoteIntOp_MGATHER(MaskedGatherSDNode *N, unsigned OpNo);
   SDValue PromoteIntOp_ADDSUBO_CARRY(SDNode *N, unsigned OpNo);
   SDValue PromoteIntOp_FRAMERETURNADDR(SDNode *N);
   SDValue PromoteIntOp_PREFETCH(SDNode *N, unsigned OpNo);
   SDValue PromoteIntOp_FIX(SDNode *N);

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

case ISD::INSERT_SUBVECTOR: {
     break;
   }
   case ISD::BITCAST:
     // Fold bit_convert nodes from a type to themselves.
     if (N1.getValueType() == VT)
       return N1;
     break;
   case ISD::VP_TRUNCATE:
-    // Don't create noop vp_truncate.
+  case ISD::VP_SIGN_EXTEND:
+  case ISD::VP_ZERO_EXTEND:
+    // Don't create noop casts.
     if (N1.getValueType() == VT)
       return N1;
     break;
   }
 
   // Memoize node if it doesn't produce a flag.
   SDNode *N;
   SDVTList VTs = getVTList(VT);

llvm/test/CodeGen/RISCV/rvv/fixed-vectors-sext-vp.ll

 ; CHECK-NEXT:  .LBB13_2:
 ; CHECK-NEXT:    vsetvli zero, a0, e64, m8, ta, ma
 ; CHECK-NEXT:    vsext.vf2 v24, v8
 ; CHECK-NEXT:    vmv.v.v v8, v24
 ; CHECK-NEXT:    ret
   %v = call <32 x i64> @llvm.vp.sext.v32i64.v32i32(<32 x i32> %va, <32 x i1> shufflevector (<32 x i1> insertelement (<32 x i1> undef, i1 true, i32 0), <32 x i1> undef, <32 x i32> zeroinitializer), i32 %evl)
   ret <32 x i64> %v
 }
+
+declare <4 x i16> @llvm.vp.sext.v4i16.v4i7(<4 x i7>, <4 x i1>, i32)
+
+define <4 x i16> @vsext_v4i16_v4i7(<4 x i7> %va, <4 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vsext_v4i16_v4i7:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, mf2, ta, ma
+; CHECK-NEXT:    vzext.vf2 v9, v8, v0.t
+; CHECK-NEXT:    vsll.vi v8, v9, 9, v0.t
+; CHECK-NEXT:    vsra.vi v8, v8, 9, v0.t
+; CHECK-NEXT:    ret
+  %v = call <4 x i16> @llvm.vp.sext.v4i16.v4i7(<4 x i7> %va, <4 x i1> %m, i32 %evl)
+  ret <4 x i16> %v
+}
+
+declare <4 x i8> @llvm.vp.sext.v4i8.v4i7(<4 x i7>, <4 x i1>, i32)
+
+define <4 x i8> @vsext_v4i8_v4i7(<4 x i7> %va, <4 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vsext_v4i8_v4i7:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e8, mf4, ta, ma
+; CHECK-NEXT:    vsll.vi v8, v8, 1, v0.t
+; CHECK-NEXT:    vsra.vi v8, v8, 1, v0.t
+; CHECK-NEXT:    ret
+  %v = call <4 x i8> @llvm.vp.sext.v4i8.v4i7(<4 x i7> %va, <4 x i1> %m, i32 %evl)
+  ret <4 x i8> %v
+}
+
+declare <4 x i15> @llvm.vp.sext.v4i15.v4i8(<4 x i8>, <4 x i1>, i32)
+
+define <4 x i15> @vsext_v4i15_v4i8(<4 x i8> %va, <4 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vsext_v4i15_v4i8:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, mf2, ta, ma
+; CHECK-NEXT:    vsext.vf2 v9, v8, v0.t
+; CHECK-NEXT:    vmv1r.v v8, v9
+; CHECK-NEXT:    ret
+  %v = call <4 x i15> @llvm.vp.sext.v4i15.v4i8(<4 x i8> %va, <4 x i1> %m, i32 %evl)
+  ret <4 x i15> %v
+}
+
+declare <4 x i15> @llvm.vp.sext.v4i15.v4i9(<4 x i9>, <4 x i1>, i32)
+
+define <4 x i15> @vsext_v4i15_v4i9(<4 x i9> %va, <4 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vsext_v4i15_v4i9:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, mf2, ta, ma
+; CHECK-NEXT:    vsll.vi v8, v8, 7, v0.t
+; CHECK-NEXT:    vsra.vi v8, v8, 7, v0.t
+; CHECK-NEXT:    ret
+  %v = call <4 x i15> @llvm.vp.sext.v4i15.v4i9(<4 x i9> %va, <4 x i1> %m, i32 %evl)
+  ret <4 x i15> %v
+}

llvm/test/CodeGen/RISCV/rvv/fixed-vectors-zext-vp.ll

 ; CHECK-NEXT:  .LBB13_2:
 ; CHECK-NEXT:    vsetvli zero, a0, e64, m8, ta, ma
 ; CHECK-NEXT:    vzext.vf2 v24, v8
 ; CHECK-NEXT:    vmv.v.v v8, v24
 ; CHECK-NEXT:    ret
   %v = call <32 x i64> @llvm.vp.zext.v32i64.v32i32(<32 x i32> %va, <32 x i1> shufflevector (<32 x i1> insertelement (<32 x i1> undef, i1 true, i32 0), <32 x i1> undef, <32 x i32> zeroinitializer), i32 %evl)
   ret <32 x i64> %v
 }
+
+declare <4 x i16> @llvm.vp.zext.v4i16.v4i7(<4 x i7>, <4 x i1>, i32)
+
+define <4 x i16> @vzext_v4i16_v4i7(<4 x i7> %va, <4 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vzext_v4i16_v4i7:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, mf2, ta, ma
+; CHECK-NEXT:    vzext.vf2 v9, v8, v0.t
+; CHECK-NEXT:    li a0, 127
+; CHECK-NEXT:    vand.vx v8, v9, a0, v0.t
+; CHECK-NEXT:    ret
+  %v = call <4 x i16> @llvm.vp.zext.v4i16.v4i7(<4 x i7> %va, <4 x i1> %m, i32 %evl)
+  ret <4 x i16> %v
+}
+
+declare <4 x i8> @llvm.vp.zext.v4i8.v4i7(<4 x i7>, <4 x i1>, i32)
+
+define <4 x i8> @vzext_v4i8_v4i7(<4 x i7> %va, <4 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vzext_v4i8_v4i7:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    li a1, 127
+; CHECK-NEXT:    vsetvli zero, a0, e8, mf4, ta, ma
+; CHECK-NEXT:    vand.vx v8, v8, a1, v0.t
+; CHECK-NEXT:    ret
+  %v = call <4 x i8> @llvm.vp.zext.v4i8.v4i7(<4 x i7> %va, <4 x i1> %m, i32 %evl)
+  ret <4 x i8> %v
+}
+
+declare <4 x i15> @llvm.vp.zext.v4i15.v4i8(<4 x i8>, <4 x i1>, i32)
+
+define <4 x i15> @vzext_v4i15_v4i8(<4 x i8> %va, <4 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vzext_v4i15_v4i8:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e16, mf2, ta, ma
+; CHECK-NEXT:    vzext.vf2 v9, v8, v0.t
+; CHECK-NEXT:    vmv1r.v v8, v9
+; CHECK-NEXT:    ret
+  %v = call <4 x i15> @llvm.vp.zext.v4i15.v4i8(<4 x i8> %va, <4 x i1> %m, i32 %evl)
+  ret <4 x i15> %v
+}
+
+declare <4 x i15> @llvm.vp.zext.v4i15.v4i9(<4 x i9>, <4 x i1>, i32)
+
+define <4 x i15> @vzext_v4i15_v4i9(<4 x i9> %va, <4 x i1> %m, i32 zeroext %evl) {
+; CHECK-LABEL: vzext_v4i15_v4i9:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    li a1, 511
+; CHECK-NEXT:    vsetvli zero, a0, e16, mf2, ta, ma
+; CHECK-NEXT:    vand.vx v8, v8, a1, v0.t
+; CHECK-NEXT:    ret
+  %v = call <4 x i15> @llvm.vp.zext.v4i15.v4i9(<4 x i9> %va, <4 x i1> %m, i32 %evl)
+  ret <4 x i15> %v
+}