https://bugs.llvm.org/show_bug.cgi?id=38517
Bug ID: 38517
Summary: opt hangs in LoadStoreVectorizer
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: jesper.antons...@ericsson.com
CC: llvm-bugs@lists.llvm.org
Created attachment 20672
--> https://bugs.llvm.org/attachment.cgi?id=20672&action=edit
reproducer with nested load
Running
opt -load-store-vectorizer -o tmp.opt.ll tmp.ll
with the attached reproducer, the LoadStoreVectorizer hangs in an endless loop.
The originating src program consists of a nested load, where the inner load's
result is used for indexing the outer load.
A somewhat shallow analysis by me indicates that the areConsecutivePointers()
function do some SCEV magic to find that the pointers for these loads are
consecutive, but it doesn't seem to me that they are. Then when vectorization
has been performed, the IR references has a loop, and when the reorder()
function is applied to it, it follows that loop endlessly.
This is the original c-program for reference:
#include <stdint.h>
uint32_t a = 0;
uint32_t b[1][3] = { { 0, 0, 0 } };
const uint16_t c = 1;
int main() {
b[(2u & b[a % 1][2u % 3]) % 1][c % 3];
}
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