https://bugs.llvm.org/show_bug.cgi?id=39626
Bug ID: 39626
Summary: opt crashes with "-early-cse-memssa -early-cse-memssa"
for any input
Product: tools
Version: 6.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: opt
Assignee: unassignedb...@nondot.org
Reporter: csz...@163.com
CC: llvm-bugs@lists.llvm.org
opt crashed when the passes sequence contains the following four subsequences:
1. "-early-cse-memssa -lcssa-verification -early-cse-memssa"
2. "-early-cse-memssa -demanded-bits -early-cse-memssa"
3. "-early-cse-memssa -lcssa-verification -demanded-bits -early-cse-memssa"
4. "-early-cse-memssa -early-cse-memssa"
It has been tested using llvm 6.0 and the trunk version even for the "hello
world!" program.
"
#include<stdio.h>
int main()
{
printf("hello world!");
return 0;
}
“
For the debug version, the output of llvm 6.0 is:
Documents/llvm/llvm6.0/llvm-6.0.0.src/lib/IR/LegacyPassManager.cpp:529: void
llvm::PMTopLevelManager::setLastUser(llvm::ArrayRef<llvm::Pass*>, llvm::Pass*):
Assertion `AnalysisPass && "Expected analysis pass to exist."' failed.
and the output of trunk version is:
/Documents/llvm/llvm/lib/IR/LegacyPassManager.cpp:586: void
llvm::PMTopLevelManager::setLastUser(llvm::ArrayRef<llvm::Pass*>, llvm::Pass*):
Assertion `AnalysisPass && "Expected analysis pass to exist."' failed.
I have used bugpoint to narrow down the problem, and it shows that the primary
reason is the fourth subsequence "-early-cse-memssa -early-cse-memssa".
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