https://bugs.llvm.org/show_bug.cgi?id=43784
Bug ID: 43784
Summary: [LoopDataPrefetch] Assertion `L->getLoopPreheader()
&& "Can't expand add recurrences without a loop
preheader!"' failed
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: pauls...@linux.vnet.ibm.com
CC: llvm-bugs@lists.llvm.org
Created attachment 22713
--> https://bugs.llvm.org/attachment.cgi?id=22713&action=edit
reduced testcase
I tried to compile the calculix benchmark with -min-prefetch-stride=1 and ran
into an assertion:
llc -O3 -mcpu=z14 ./tc_prefstride1.ll -o - -min-prefetch-stride=1
ScalarEvolutionExpander.cpp:1264: llvm::PHINode*
llvm::SCEVExpander::getAddRecExprPHILiterally(const llvm::SCEVAddRecExpr*
, const llvm::Loop*, llvm::Type*, llvm::Type*, llvm::Type*&, bool&): Assertion
`L->getLoopPreheader() && "Can't expand add recurrences without a loop
preheader!"' failed.
...
#24 0x000000000261e346 llvm::SCEVExpander::expandCodeFor(llvm::SCEV const*,
llvm::Type*)
#25 0x0000000002e4d5be (anonymous namespace)::LoopDataPrefetch::run()
...
It seems there currently is no check for isLoopSimplifyForm() or even if the
loop has a preheader in LoopDataPrefetch, and I wonder why that is...
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