https://bugs.llvm.org/show_bug.cgi?id=41780
Bug ID: 41780
Summary: [SystemZ] Assertion "Invalid truncate node, src <
dst!" failed
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: SystemZ
Assignee: unassignedb...@nondot.org
Reporter: pauls...@linux.vnet.ibm.com
CC: llvm-bugs@lists.llvm.org
Created attachment 21901
--> https://bugs.llvm.org/attachment.cgi?id=21901&action=edit
reduced test case
llc -mcpu=z13 -O3 -o out.s ./tc_invalidtrunc.ll
SystemZTargetLowering::combineExtract() tries to truncate from i16 to i32.
I am a bit confused about all the implications of extracting a vector element
from a BUILD_VECTOR using possibly another vector type (VecVT) (?), so I have
not attempted a patch yet.
The comment "We're extracting the low part of one operand of the
BUILD_VECTOR.": does this mean we are expecting at this point to truncate the
value always? Or could we make an extension in the integer case, per the
comment:
/// EXTRACT_VECTOR_ELT(VECTOR, IDX) - Returns a single element from VECTOR
/// identified by the (potentially variable) element number IDX. If the
/// return type is an integer type larger than the element type of the
/// vector, the result is extended to the width of the return type. In
/// that case, the high bits are undefined.
If we could do an ANY_EXTEND, this test case would be handled here (although I
am not sure if thats beneficial or not), or if not, I guess it should just
"break" (return without doing anything).
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