[llvm-bugs] [Bug 32275] New: llvm-stress causes type legalizer to crash

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Mar 15 00:19:34 PDT 2017


            Bug ID: 32275
           Summary: llvm-stress causes type legalizer to crash
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: paulsson at linux.vnet.ibm.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 18094
  --> https://bugs.llvm.org/attachment.cgi?id=18094&action=edit
test case

Optimized lowered selection DAG: BB#4 'autogen_SD29574:CF34'
electionDAG has 46 nodes:
  t0: ch = EntryToken
    t17: v16i8,ch = CopyFromReg t0, Register:v16i8 %vreg13
  t18: v4i8 = extract_subvector t17, Constant:i32<0>
  t36: v2i64,ch = CopyFromReg t0, Register:v2i64 %vreg5
  t38: v2i64,ch = CopyFromReg t36:1, Register:v2i64 %vreg6
  t40: v2i64,ch = CopyFromReg t38:1, Register:v2i64 %vreg7
  t42: v2i64,ch = CopyFromReg t40:1, Register:v2i64 %vreg8
  t44: v2i64,ch = CopyFromReg t42:1, Register:v2i64 %vreg9
  t46: v2i64,ch = CopyFromReg t44:1, Register:v2i64 %vreg10
  t48: v2i64,ch = CopyFromReg t46:1, Register:v2i64 %vreg11
          t2: v8i16 = BUILD_VECTOR Constant:i16<0>, Constant:i16<0>,
Constant:i16<0>, Constant:i16<0>, Constant:i16<0>, Constant:i16<0>, Constant:i
16<0>, Constant:i16<0>
        t5: ch = CopyToReg t0, Register:v8i16 %vreg16, t2
          t59: v4i32 = any_extend t18
        t22: ch = CopyToReg t0, Register:v4i32 %vreg17, t59
            t50: v2i64,ch = CopyFromReg t48:1, Register:v2i64 %vreg12
          t51: v16i64 = concat_vectors t36, t38, t40, t42, t44, t46, t48, t50
          t31: i64,ch = CopyFromReg t0, Register:i64 %vreg4
        t52: ch = store<ST128[%Sl9]> t0, t51, t31, undef:i64
      t55: ch = TokenFactor t5, t22, t52
          t19: v4i1 = truncate t18
            t26: v4i32,ch = CopyFromReg t0, Register:v4i32 %vreg14
          t27: v4i1 = truncate t26
        t29: v4i1 = setcc t19, t27, setlt:ch
      t53: i1 = extract_vector_elt t29, Constant:i32<3>
    t56: ch = brcond t55, t53, BasicBlock:ch<CF34 0x55692e8>
  t58: ch = br t56, BasicBlock:ch<CF36 0x5569398>

DAGTypeLegalizer::PromoteIntRes_TRUNCATE(t19) crashes, as it should be widened
on SystemZ, and this method won't do that.

Why does this end up here? 

bin/llc -mtriple=s390x-linux-gnu -mcpu=z13

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