https://bugs.llvm.org/show_bug.cgi?id=40394
Bug ID: 40394
Summary: [DAGCombiner] crash when forming shuffle from build
vector
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: spatel+l...@rotateright.com
CC: llvm-bugs@lists.llvm.org
This will crash using llc built from trunk r351752:
target triple = "aarch64-unknown-linux-gnu"
define <4 x i32> @truncating_build_vector_crash(<4 x i16> %t0) {
%t1 = extractelement <4 x i16> %t0, i32 2
%vgetq_lane = zext i16 %t1 to i32
%t2 = insertelement <4 x i32> undef, i32 %vgetq_lane, i64 0
ret <4 x i32> %t2
}
--------------------------------------------------------------------------
The bug was introduced with:
https://reviews.llvm.org/D56281 / https://reviews.llvm.org/rL351198
I committed a fix that limits the transform to avoid the crash here:
https://reviews.llvm.org/rL351753
I think we should pull that commit into the 8.0 release to avoid the crash.
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