https://bugs.llvm.org/show_bug.cgi?id=41066
Bug ID: 41066
Summary: X86 ISel gets stuck in infinite loop
Product: libraries
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Created attachment 21595
--> https://bugs.llvm.org/attachment.cgi?id=21595&action=edit
IR that triggers bug
Using SVN revision 356146 (from 2019/03/14), llc gets stuck in a loop on the
attached input, when run with the command-line:
llc llvm-lock2.ll -mcpu=skylake-avx512
Using llc from the LLVM 6.0 release does not get stuck in a loop.
Running it with e.g. -mcpu=skylake also does not get stuck in a loop. Based on
this, I've assumed this is an X86/AVX512 target specific bug.
Passing -debug prints the following in a loop:
Combining: t13: v2i64 = or t1518, t2
Combining: t1518: v2i64 = vselect t1517, t11, t10
Creating new node: t1519: v2i1 = xor t1517, t24
Creating new node: t1520: v2i64 = vselect t1519, t10, t11
... into: t1520: v2i64 = vselect t1519, t10, t11
Combining: t13: v2i64 = or t1520, t2
Combining: t1520: v2i64 = vselect t1519, t10, t11
Creating new node: t1521: v2i1 = xor t1519, t24
Creating new node: t1522: v2i64 = vselect t1521, t11, t10
... into: t1522: v2i64 = vselect t1521, t11, t10
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