http://llvm.org/bugs/show_bug.cgi?id=19730
Bug ID: 19730
Summary: Assertion failure when replacing shuffle vectors in
Instruction Combine
Product: new-bugs
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
This is introduced by r208488 related to 19717
http://llvm.org/bugs/show_bug.cgi?id=19717.
When two shuffles have different types, an assertion failure may happen. To
reproduce with following case simple.ll:
---------------------------------------------------------------------------------
define <8 x i8> @test(<16 x i8> %in0) {
entry:
%shuffle = shufflevector <16 x i8> %in0, <16 x i8> undef, <8 x i32> <i32 7,
i32 6, i32 5, i32 4, i32 3, i32 2, i32 1, i32 0>
%shuffle1 = shufflevector <8 x i8> %shuffle, <8 x i8> undef, <8 x i32> <i32
7, i32 6, i32 5, i32 4, i32 3, i32 2, i32 1, i32 0>
ret <8 x i8> %shuffle1
}
---------------------------------------------------------------------------------
To run as following:
$opt -S -instcombine simple.ll
opt: llvm/lib/IR/Value.cpp:309: void
llvm::Value::replaceAllUsesWith(llvm::Value*): Assertion `New->getType() ==
getType() && "replaceAllUses of value with new value of different type!"'
failed.
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