https://bugs.llvm.org/show_bug.cgi?id=37551
Bug ID: 37551
Summary: crash at conditional operator with builtins returning
void
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: eugvelesev...@gmail.com
CC: llvm-bugs@lists.llvm.org
Created attachment 20329
--> https://bugs.llvm.org/attachment.cgi?id=20329&action=edit
run test
Originally clang crashed at inputmethod package from tizen(inputmethod.cpp)
But I reduced it to:
void get(void* g) {
g ? __builtin_prefetch(g, 0, 1) : __builtin_prefetch(g, 0, 1);
}
and found a reason.
In ScalarExprEmitter::VisitAbstractConditionalOperator from CGExprScalar.cpp
phi instruction with void type is created. In case not-builtin function call
LHS or RHS are null and the instruction isn't created. But in case of builtin
functions the LHS is a void type llvm::Value created in
CodeGenFunction::EmitBuiltinExpr from CGBuiltin.cpp.
I think it's necessary to check builtins with void return type and replace
return expressions with null in CodeGenFunction::EmitBuiltinExpr.
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