https://bugs.llvm.org/show_bug.cgi?id=43414
Bug ID: 43414
Summary: DAGCombiner never finishes
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangbugs at nondot.org
Reporter: trass3r at gmail.com
CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
richard-llvm at metafoo.co.uk
Created attachment 22549
--> https://bugs.llvm.org/attachment.cgi?id=22549&action=edit
test files
$ clang++ -O2 -fno-exceptions -fno-rtti -c test.cpp -ftime-trace
seems to be stuck in DAGCombiner, even after 20 minutes.
test.smaller.cpp finishes after 2 minutes and spends its time in InstCombine
mainly. The generated code is really bad, tens of thousands of mov dword ptr
[rsp + i], x
It's possible to force it to do the right thing with an explicit constexpr but
that shouldn't be necessary.
$ clang++ -v
clang version 10.0.0 (https://github.com/llvm/llvm-project.git
a1d86857fff28f37e186f0bf99ede37d18dd2448)
Target: x86_64-pc-windows-msvc
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