[llvm-bugs] [Bug 36320] New: [Hexagon] crash: CANNOT select: t16: v32i1 = HexagonISD::QFALSE
via llvm-bugs
llvm-bugs at lists.llvm.org
Fri Feb 9 10:17:06 PST 2018
https://bugs.llvm.org/show_bug.cgi?id=36320
Bug ID: 36320
Summary: [Hexagon] crash: CANNOT select: t16: v32i1 =
HexagonISD::QFALSE
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: Hexagon
Assignee: unassignedbugs at nondot.org
Reporter: spatel+llvm at rotateright.com
CC: llvm-bugs at lists.llvm.org
The following is a slight modification of an existing Hexagon regression test
at:
test/CodeGen/Hexagon/autohvx/isel-setcc-pair.ll
The only difference is that I have replaced an 'undef' operand of the vector
'and' instruction with a zero operand.
As noted in bug 36305, our handling of undef operands in the DAG is wrong. In
this particular case, I think the difference is caused because currently in the
DAG for vectors we have:
and x, undef --> undef
But this is wrong. It should be:
and x, undef --> 0
-----------------------------------------------------------------------------
; RUN: llc -march=hexagon < %s | FileCheck %s
; Check that a setcc of a vector pair is handled (without crashing).
; CHECK: vcmp
target datalayout =
"e-m:e-p:32:32:32-a:0-n16:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048"
target triple = "hexagon"
; Function Attrs: nounwind
define hidden fastcc void @fred(i32 %a0) #0 {
b1:
%v2 = insertelement <32 x i32> undef, i32 %a0, i32 0
%v3 = shufflevector <32 x i32> %v2, <32 x i32> undef, <32 x i32>
zeroinitializer
%v4 = icmp eq <32 x i32> %v3, undef
%v5 = and <32 x i1> zeroinitializer, %v4
br label %b6
b6: ; preds = %b1
%v7 = extractelement <32 x i1> %v5, i32 22
br i1 %v7, label %b8, label %b9
b8: ; preds = %b6
unreachable
b9: ; preds = %b6
unreachable
}
attributes #0 = { nounwind "target-cpu"="hexagonv60"
"target-features"="+hvx,+hvx-length64b" }
--
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20180209/72733c7f/attachment.html>
More information about the llvm-bugs
mailing list