http://llvm.org/bugs/show_bug.cgi?id=19737
Bug ID: 19737
Summary: Assertion failure about type casting BinaryOperator
when reordering shuffle and binary operation
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
This bug is related to 19717 and 19730.
The CreateBinOpAsGiven() assumes that CreateBinOp will return a BinaryOperator
type. But when two operands are Constant, it may optimize the result and just
return a Constant. As a result, there is a type cast assertion failure.
To reproduce with following case test.ll:
---------------------------------------------------------------------------------
define i32 @test(<4 x i32> %in0) {
entry:
%shuffle.i = shufflevector <4 x i32> zeroinitializer, <4 x i32> %in0, <4 x
i32> <i32 0, i32 4, i32 2, i32 6>
%neg.i = xor <4 x i32> %shuffle.i, <i32 -1, i32 -1, i32 -1, i32 -1>
%and.i = and <4 x i32> %in0, %neg.i
%0 = extractelement <4 x i32> %and.i, i32 0
ret i32 %0
}
---------------------------------------------------------------------------------
To run as following:
$ opt -S -instcombine test.ll
opt: llvm/include/llvm/Support/Casting.h:237: typename llvm::cast_retty<X,
Y*>::ret_type llvm::cast(Y*) [with X = llvm::BinaryOperator; Y = llvm::Value;
typename llvm::cast_retty<X, Y*>::ret_type = llvm::BinaryOperator*]: Assertion
`isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
Note that not only XOR, creating other binary operation may also result into
Constant type instead of a BinaryOperator.
Thanks,
-Hao
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