https://bugs.llvm.org/show_bug.cgi?id=49690
Bug ID: 49690
Summary: [RegAlloc: Subreg liveness] Bad machine code: Subrange
must not be empty
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: pauls...@linux.vnet.ibm.com
CC: llvm-bugs@lists.llvm.org
Created attachment 24684
--> https://bugs.llvm.org/attachment.cgi?id=24684&action=edit
reduced testcase
llc -mcpu=arch13 -O3 -disable-machine-dce -disable-cgp -systemz-subreg-liveness
-join-globalcopies=false -verify-misched tc_crash0_aftercreduce.ll
# Before machine scheduling.
********** INTERVALS **********
R2L [0B,16r:0)[176r,192r:1) 0@0B-phi 1@176r
R2H [0B,16r:0)[176r,192r:1) 0@0B-phi 1@176r
%0 [16r,144r:0)[160B,176r:0) 0@16r L0000000000000000 EMPTY LFFFFFFFFFFFFFFFF
[16r,144r:0)[160B,176r:0) 0@16r weight:0.000000e+00
%3 [48r,64r:0) 0@48r weight:0.000000e+00
RegMasks:
********** MACHINEINSTRS **********
# Machine code for function e: NoPHIs, TracksLiveness, TiedOpsRewritten
Function Live Ins: $r2d in %1
0B bb.0.bb:
successors: %bb.2(0x80000000), %bb.1(0x00000000); %bb.2(100.00%),
%bb.1(0.00%)
liveins: $r2d
16B %0:gr64bit = COPY $r2d
48B %3:grx32bit = LHIMux 0
64B CHIMux %3:grx32bit, 0, implicit-def $cc
80B BRC 14, 6, %bb.2, implicit killed $cc
96B J %bb.1
112B bb.1.bb1:
; predecessors: %bb.0
144B STGRL %0:gr64bit, @d :: (store 8 into @d)
160B bb.2.bb3:
; predecessors: %bb.0
176B $r2d = COPY %0:gr64bit
192B Return implicit $r2d
# End machine code for function e.
*** Bad machine code: Subrange must not be empty ***
- function: e
- liverange: EMPTY
- v. register: %0
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