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Can someone explain to me why lli on instruction "%broadcast.splatinsert.i = insertelement <4 x i32> undef, i32 %reverse.idx.i, i32 0"
prints "Instruction not interpretable yet! ?

lli ver 3.3 full source https://www.sendspace.com/file/e9kgng

block of code:

vector.body.i:                                    ; preds = %vector.body.i, %for.body.lr.ph.i
  %index.i = phi i64 [ %index.next.i, %vector.body.i ], [ 0, %for.body.lr.ph.i ]
  %vec.phi.i = phi <4 x i32> [ %86, %vector.body.i ], [ <i32 1, i32 1, i32 1, i32 1>, %for.body.lr.ph.i ]
  %vec.phi11.i = phi <4 x i32> [ %87, %vector.body.i ], [ <i32 1, i32 1, i32 1, i32 1>, %for.body.lr.ph.i ]
  %resize.norm.idx.i = trunc i64 %index.i to i32
  %reverse.idx.i = sub i32 %.x.i113, %resize.norm.idx.i
  %broadcast.splatinsert.i = insertelement <4 x i32> undef, i32 %reverse.idx.i, i32 0
  %broadcast.splat.i = shufflevector <4 x i32> %broadcast.splatinsert.i, <4 x i32> undef, <4 x i32> zeroinitializer
  %induction.i = add <4 x i32> %broadcast.splat.i, <i32 0, i32 -1, i32 -2, i32 -3>
  %84 = load i64* %main_HideLocalConstant_variable_14
  %main_hide_const_value83 = xor i64 %84, 8
  %induction12.i = add <4 x i32> %broadcast.splat.i, <i32 -4, i32 -5, i32 -6, i32 -7>
  %85 = load i64* %main_HideLocalConstant_variable_4
  %main_hide_const_value21 = xor i64 %85, %main_hide_const_value83
  %86 = mul <4 x i32> %vec.phi.i, %induction.i
  %87 = mul <4 x i32> %vec.phi11.i, %induction12.i
  %index.next.i = add i64 %index.i, %main_hide_const_value21
  %88 = icmp eq i64 %index.next.i, %n.vec.i
  br i1 %88, label %middle.block.i, label %vector.body.i
llvmuser12
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1 Answers1

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there is an "undef" operand as you see, and hence instruction can not be interpreted. if this bitcode is output of LoopVectorize pass in llvm 3.3, then I would see it might be a bug which perhaps has been fixed in the newer versions.

hadi sadeghi
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