[llvm-dev] LLVM ERROR: Cannot select adde

[Phil Tomson via llvm-dev]

We're getting this error from one of the LLVM testcases in 3.9 (also had it
in 3.6) for our target:

LLVM ERROR: Cannot select: t36: i64,glue = adde t8, t4, t35:1
  t8: i64,ch = CopyFromReg t0, Register:i64 %vreg3
    t7: i64 = Register %vreg3
  t4: i64,ch = CopyFromReg t0, Register:i64 %vreg1
    t3: i64 = Register %vreg1
  t35: i64,glue = addc t6, t2
    t6: i64,ch = CopyFromReg t0, Register:i64 %vreg2
      t5: i64 = Register %vreg2
    t2: i64,ch = CopyFromReg t0, Register:i64 %vreg0
      t1: i64 = Register %vreg0
In function: test_add


The testcase is test/CodeGen/Generic/i128-addsub.ll:
define void @test_add(i64 %AL, i64 %AH, i64 %BL, i64 %BH, i64* %RL, i64*
%RH) {
entry:
  %tmp1 = zext i64 %AL to i128    ; <i128> [#uses=1]
  %tmp23 = zext i64 %AH to i128   ; <i128> [#uses=1]
  %tmp4 = shl i128 %tmp23, 64   ; <i128> [#uses=1]
  %tmp5 = or i128 %tmp4, %tmp1    ; <i128> [#uses=1]
  %tmp67 = zext i64 %BL to i128   ; <i128> [#uses=1]
  %tmp89 = zext i64 %BH to i128   ; <i128> [#uses=1]
  %tmp11 = shl i128 %tmp89, 64    ; <i128> [#uses=1]
  %tmp12 = or i128 %tmp11, %tmp67   ; <i128> [#uses=1]
  %tmp15 = add i128 %tmp12, %tmp5   ; <i128> [#uses=2]
  %tmp1617 = trunc i128 %tmp15 to i64   ; <i64> [#uses=1]
  store i64 %tmp1617, i64* %RL
  %tmp21 = lshr i128 %tmp15, 64   ; <i128> [#uses=1]
  %tmp2122 = trunc i128 %tmp21 to i64   ; <i64> [#uses=1]
  store i64 %tmp2122, i64* %RH
  ret void
}


I've added the following to our Target's TargetISelLowering constructor:
  setOperationAction(ISD::ADDE,               MVT::i32, Expand);
  setOperationAction(ISD::ADDE,               MVT::i64, Expand);
  setOperationAction(ISD::ADDE,               MVT::i16, Expand);
  setOperationAction(ISD::ADDE,               MVT::i8, Expand);
  setOperationAction(ISD::ADDE,               MVT::f32, Expand);
  setOperationAction(ISD::ADDE,               MVT::f64, Expand);

... but it still gives the same error. I'm not sure how the adde node si
getting in there - any ideas?

Phil
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