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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SROA calls PromoteMemToReg on something it can't handle"
href="http://llvm.org/bugs/show_bug.cgi?id=16867">16867</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>SROA calls PromoteMemToReg on something it can't handle
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nlewycky@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>chandlerc@gmail.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Testcase module:
target datalayout =
"e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32-S128"
target triple = "i386-unknown-linux-gnu"
%type = type { i8* }
define void @test() {
bb:
%tmp = alloca i8*, align 4
unreachable
bb51:
%tmp52 = bitcast i8** %tmp to %type*
%tmp53 = bitcast %type* %tmp52 to i8**
%tmp54 = load i8** %tmp53, align 4
unreachable
}
Triggers this crash:
$ opt -sroa c.ll
opt: /usr/local/google/home/nlewycky/llvm/include/llvm/Support/Casting.h:239:
typename llvm::cast_retty<X, Y*>::ret_type llvm::cast(Y*) [with X =
llvm::StoreInst, Y = llvm::Instruction, typename llvm::cast_retty<X,
Y*>::ret_type = llvm::StoreInst*]: Assertion `isa<X>(Val) && "cast<Ty>()
argument of incompatible type!"' failed.
0 opt 0x000000000199a05f llvm::sys::PrintStackTrace(_IO_FILE*) +
38
1 opt 0x000000000199a2e6
2 opt 0x0000000001999d2a
3 libpthread.so.0 0x00007f5afe5e4cb0
4 libc.so.6 0x00007f5afd60f425 gsignal + 53
5 libc.so.6 0x00007f5afd612b8b abort + 379
6 libc.so.6 0x00007f5afd6080ee
7 libc.so.6 0x00007f5afd608192
8 opt 0x00000000012bffd0 llvm::cast_retty<llvm::StoreInst,
llvm::Instruction*>::ret_type llvm::cast<llvm::StoreInst,
llvm::Instruction>(llvm::Instruction*) + 62
9 opt 0x0000000001568994
10 opt 0x0000000001568ea3
11 opt 0x000000000156b3a2
llvm::PromoteMemToReg(llvm::ArrayRef<llvm::AllocaInst*>, llvm::DominatorTree&,
llvm::DataLayout const*, llvm::AliasSetTracker*) + 154
12 opt 0x0000000001432369
13 opt 0x0000000001432c9e
14 opt 0x000000000191f6dc
llvm::FPPassManager::runOnFunction(llvm::Function&) + 390
15 opt 0x000000000191f8d7
llvm::FPPassManager::runOnModule(llvm::Module&) + 89
16 opt 0x000000000191fc4f
llvm::MPPassManager::runOnModule(llvm::Module&) + 573
17 opt 0x0000000001920264 llvm::PassManagerImpl::run(llvm::Module&)
+ 254
18 opt 0x0000000001920477 llvm::PassManager::run(llvm::Module&) +
39
19 opt 0x000000000095bf45 main + 5778
20 libc.so.6 0x00007f5afd5fa76d __libc_start_main + 237
21 opt 0x000000000094dd79
Stack dump:
0. Program arguments: llvm/Debug+Asserts/bin/opt -sroa c.ll
1. Running pass 'Function Pass Manager' on module 'c.ll'.
2. Running pass 'SROA' on function '@test'
Aborted (core dumped)
>From GDB:
#5 0x0000000001568994 in promoteSingleBlockAlloca (AI=0x29e2068, Info=...,
LBI=..., AST=0x0) at PromoteMemoryToRegister.cpp:564
564 StoreInst *SI = cast<StoreInst>(AI->use_back());
(gdb) call AI->use_empty()
$1 = false
(gdb) call AI->use_back()
$2 = (llvm::Instruction *) 0x29e18b8
(gdb) call AI->use_back()->dump()
%tmp52 = bitcast i8** %tmp to %type*</pre>
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