[llvm-bugs] [Bug 25719] New: clang front-end crashes trying to codegen an fma when the mul has multiple uses
via llvm-bugs
llvm-bugs at lists.llvm.org
Wed Dec 2 11:25:37 PST 2015
https://llvm.org/bugs/show_bug.cgi?id=25719
Bug ID: 25719
Summary: clang front-end crashes trying to codegen an fma when
the mul has multiple uses
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangbugs at nondot.org
Reporter: spatel+llvm at rotateright.com
CC: llvm-bugs at lists.llvm.org
Classification: Unclassified
$ cat fpcontract.c
#pragma STDC FP_CONTRACT ON
float foo(float U, float base, float cell) {
return (U = 2 * base) - cell;
}
$ ./clang -ffp-contract=on fpcontract.c
Assertion failed: (LHSBinOp->getNumUses() == 0 && "Operations with multiple
uses shouldn't be contracted."), function tryEmitFMulAdd, file
/Users/spatel/myllvm/llvm/tools/clang/lib/CodeGen/CGExprScalar.cpp, line 2570.
0 clang-3.8 0x00000001123ac4ae
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 46
1 clang-3.8 0x00000001123ac8f9
PrintStackTraceSignalHandler(void*) + 25
2 clang-3.8 0x00000001123a9099 llvm::sys::RunSignalHandlers() +
425
3 clang-3.8 0x00000001123acc59 SignalHandler(int) + 345
4 libsystem_platform.dylib 0x00007fff9cfac52a _sigtramp + 26
5 clang-3.8 0x000000011619c88d guard variable for
shouldAddRequirement(clang::Module*, llvm::StringRef, bool&)::IOKitAVC + 109101
6 clang-3.8 0x00000001123ac91b raise + 27
7 clang-3.8 0x00000001123ac9d2 abort + 18
8 clang-3.8 0x00000001123ac9b1 __assert_rtn + 129
9 clang-3.8 0x0000000112826ba9 tryEmitFMulAdd((anonymous
namespace)::BinOpInfo const&, clang::CodeGen::CodeGenFunction const&,
clang::CodeGen::CGBuilderTy&, bool) + 377
10 clang-3.8 0x000000011281153a (anonymous
namespace)::ScalarExprEmitter::EmitSub((anonymous namespace)::BinOpInfo const&)
+ 714
11 clang-3.8 0x0000000112814b75 (anonymous
namespace)::ScalarExprEmitter::VisitBinSub(clang::BinaryOperator const*) + 53
12 clang-3.8 0x0000000112812ef2
clang::StmtVisitorBase<clang::make_ptr, (anonymous
namespace)::ScalarExprEmitter, llvm::Value*>::Visit(clang::Stmt*) + 290
13 clang-3.8 0x000000011280d029 (anonymous
namespace)::ScalarExprEmitter::Visit(clang::Expr*) + 73
14 clang-3.8 0x000000011280cf90
clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool) + 192
15 clang-3.8 0x00000001128e9b5f
clang::CodeGen::CodeGenFunction::EmitReturnStmt(clang::ReturnStmt const&) + 927
16 clang-3.8 0x00000001128e7771
clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*) + 993
17 clang-3.8 0x00000001128f4785
clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt
const&, bool, clang::CodeGen::AggValueSlot) + 133
18 clang-3.8 0x00000001129443a4
clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::CodeGen::FunctionArgList&,
clang::Stmt const*) + 116
19 clang-3.8 0x0000000112944c4c
clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl,
llvm::Function*, clang::CodeGen::CGFunctionInfo const&) + 1900
20 clang-3.8 0x00000001129624a1
clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl,
llvm::GlobalValue*) + 577
21 clang-3.8 0x000000011295c30d
clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl,
llvm::GlobalValue*) + 733
22 clang-3.8 0x000000011296116c
clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) + 1116
23 clang-3.8 0x0000000112964804
clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) + 292
24 clang-3.8 0x0000000112accddd (anonymous
namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) + 157
25 clang-3.8 0x0000000112937d74
clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) + 196
26 clang-3.8 0x0000000113d3b5e6 clang::ParseAST(clang::Sema&,
bool, bool) + 966
27 clang-3.8 0x0000000112e814bf
clang::ASTFrontendAction::ExecuteAction() + 511
28 clang-3.8 0x00000001129366b7
clang::CodeGenAction::ExecuteAction() + 5991
29 clang-3.8 0x0000000112e80a20 clang::FrontendAction::Execute()
+ 112
30 clang-3.8 0x0000000112dd4a91
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 1873
31 clang-3.8 0x0000000112f0fc4a
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 4410
32 clang-3.8 0x000000010ff9261e cc1_main(llvm::ArrayRef<char
const*>, char const*, void*) + 4926
33 clang-3.8 0x000000010ff8219f
ExecuteCC1Tool(llvm::ArrayRef<char const*>, llvm::StringRef) + 479
34 clang-3.8 0x000000010ff7fcfd main + 3245
35 libdyld.dylib 0x00007fff88c5f5ad start + 1
36 libdyld.dylib 0x0000000000000030 start + 2000292484
Stack dump:
0. Program arguments: /Users/spatel/myllvm/build2/bin/clang-3.8 -cc1 -triple
x86_64-apple-macosx10.11.0 -Wdeprecated-objc-isa-usage
-Werror=deprecated-objc-isa-usage -emit-obj -mrelax-all -disable-free
-main-file-name fpcontract.c -mrelocation-model pic -pic-level 2 -mthread-model
posix -mdisable-fp-elim -ffp-contract=on -masm-verbose -munwind-tables
-target-cpu core2 -target-linker-version 253.6 -dwarf-column-info -resource-dir
/Users/spatel/myllvm/build2/bin/../lib/clang/3.8.0
-I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/usr/include/
-fdebug-compilation-dir /Users/spatel/myllvm/build2/bin -ferror-limit 19
-fmessage-length 197 -stack-protector 1 -fblocks -fobjc-runtime=macosx-10.11.0
-fencode-extended-block-signature -fmax-type-align=16 -fdiagnostics-show-option
-fcolor-diagnostics -o
/var/folders/wd/6v6_1gq16p1fbth_yn1pr41m0000gn/T/fpcontract-66e2d2.o -x c
fpcontract.c
1. <eof> parser at end of file
2. fpcontract.c:2:7: LLVM IR generation of declaration 'foo'
3. fpcontract.c:2:7: Generating code for declaration 'foo'
clang-3.8: error: unable to execute command: Illegal instruction: 4
clang-3.8: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.8.0 (trunk 254421)
Target: x86_64-apple-darwin15.0.0
Thread model: posix
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