[llvm-bugs] [Bug 36425] New: Bad machine code: Live segment doesn't end at a valid instruction

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36425

            Bug ID: 36425
           Summary: Bad machine code: Live segment doesn't end at a valid
                    instruction
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Register Allocator
          Assignee: unassignedbugs at nondot.org
          Reporter: paulsson at linux.vnet.ibm.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 19890
  --> https://bugs.llvm.org/attachment.cgi?id=19890&action=edit
reduced testcase

bin/llc -mtriple=s390x-linux-gnu -mcpu=z13 -O3 tc_liveseg.ll -o out.s
-disable-machine-dce -verify-machineinstrs

# After Simple Register Coalescing
********** INTERVALS **********
%0 [320r,320d:0)  0 at 320r weight:0.000000e+00
%1 [176r,224d:0)  0 at 176r weight:0.000000e+00
%3 [96r,176r:0)  0 at 96r weight:0.000000e+00
%12 [16r,32r:0)  0 at 16r weight:0.000000e+00
RegMasks:
********** MACHINEINSTRS **********
# Machine code for function main: NoPHIs, TracksLiveness

0B      bb.0 (%ir-block.0):
          successors: %bb.1(0x40000000), %bb.2(0x40000000); %bb.1(50.00%),
%bb.2(50.00%)

16B       %12:grx32bit = LHIMux 0
32B       CHIMux %12, 0, implicit-def $cc
48B       BRC 14, 6, %bb.2, implicit killed $cc
64B       J %bb.1

80B     bb.1 (%ir-block.3):
        ; predecessors: %bb.0

96B       %3:gr64bit = LGRL @g_47; mem:LD8[bitcast (<{ i8, i8, i8, i8, i8, i8,
i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, i64 }>* @g_47 to
i152*)](noalias=!2)(dereferenceable)
176B      %1:gr64bit = SRLG %3, $noreg, 8
320B      dead %0:gr64bit = LGHI 0

336B    bb.2 (%ir-block.5):
        ; predecessors: %bb.0


# End machine code for function main.

*** Bad machine code: Live segment doesn't end at a valid instruction ***
- function:    main
- basic block: %bb.1  (0x52de358) [80B;336B)
- liverange:   [176r,224d:0)  0 at 176r
- v. register: %1
- segment:     [176r,224d:0)
LLVM ERROR: Found 1 machine code errors.

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