Test Failure: Transforms/LoopVectorize/runtime-check.ll

Test source: git

Comments: Bug in IR semantics or optimization: escapes noescape pointer

Log:

Source: <stdin>
ERROR: Unsupported attribute: noalias

----------------------------------------
define i32 @foo(ptr nocapture %a, ptr nocapture %b, i32 %n) {
%entry:
  %cmp6 = icmp sgt i32 %n, 0
  br i1 %cmp6, label %for.body, label %for.end

%for.body:
  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
  %arrayidx = gep inbounds ptr nocapture %b, 4 x i64 %indvars.iv
  %0 = load float, ptr %arrayidx, align 4
  %mul = fmul float %0, 3.000000, exceptions=ignore
  %arrayidx2 = gep inbounds ptr nocapture %a, 4 x i64 %indvars.iv
  store float %mul, ptr %arrayidx2, align 4
  %indvars.iv.next = add i64 %indvars.iv, 1
  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
  %exitcond = icmp eq i32 %lftr.wideiv, %n
  br i1 %exitcond, label %for.end, label %for.body

%for.end:
  ret i32 undef
}
=>
define i32 @foo(ptr nocapture %a, ptr nocapture %b, i32 %n) {
%entry:
  %b2 = ptrtoint ptr nocapture %b to i64
  %a1 = ptrtoint ptr nocapture %a to i64
  %cmp6 = icmp sgt i32 %n, 0
  br i1 %cmp6, label %for.body.preheader, label %for.end

%for.body.preheader:
  %0 = add i32 %n, 4294967295
  %1 = zext i32 %0 to i64
  %2 = add nsw nuw i64 %1, 1
  %min.iters.check = icmp ult i32 %0, 3
  br i1 %min.iters.check, label %scalar.ph, label %vector.memcheck

%vector.memcheck:
  %3 = sub i64 %a1, %b2
  %diff.check = icmp ult i64 %3, 16
  br i1 %diff.check, label %scalar.ph, label %vector.ph

%vector.ph:
  %n.vec = and i64 %2, 8589934588
  br label %vector.body

%vector.body:
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %4 = gep inbounds ptr nocapture %b, 4 x i64 %index
  %5 = bitcast ptr %4 to ptr
  %wide.load = load <4 x float>, ptr %5, align 4
  %6 = fmul <4 x float> %wide.load, { 3.000000, 3.000000, 3.000000, 3.000000 }, exceptions=ignore
  %7 = gep inbounds ptr nocapture %a, 4 x i64 %index
  %8 = bitcast ptr %7 to ptr
  store <4 x float> %6, ptr %8, align 4
  %index.next = add nuw i64 %index, 4
  %9 = icmp eq i64 %index.next, %n.vec
  br i1 %9, label %middle.block, label %vector.body

%middle.block:
  %cmp.n = icmp eq i64 %2, %n.vec
  br i1 %cmp.n, label %for.end.loopexit, label %scalar.ph

%scalar.ph:
  %bc.resume.val = phi i64 [ %n.vec, %middle.block ], [ 0, %for.body.preheader ], [ 0, %vector.memcheck ]
  br label %for.body

%for.body:
  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ %bc.resume.val, %scalar.ph ]
  %arrayidx = gep inbounds ptr nocapture %b, 4 x i64 %indvars.iv
  %10 = load float, ptr %arrayidx, align 4
  %mul = fmul float %10, 3.000000, exceptions=ignore
  %arrayidx2 = gep inbounds ptr nocapture %a, 4 x i64 %indvars.iv
  store float %mul, ptr %arrayidx2, align 4
  %indvars.iv.next = add i64 %indvars.iv, 1
  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
  %exitcond = icmp eq i32 %lftr.wideiv, %n
  br i1 %exitcond, label %for.end.loopexit, label %for.body

%for.end.loopexit:
  br label %for.end

%for.end:
  ret i32 undef
}
Transformation doesn't verify!
ERROR: Source is more defined than target

Example:
ptr nocapture %a = poison
ptr nocapture %b = poison
i32 %n = #x00000000 (0)

Source:
i1 %cmp6 = #x0 (0)
  >> Jump to %for.end

SOURCE MEMORY STATE
===================
NON-LOCAL BLOCKS:
Block 0 >	size: 0	align: 4	alloc type: 0	address: 0
Block 1 >	size: 4761645935508795537	align: 2	alloc type: 0	address: 2459392455888344144
Block 2 >	size: 2468361101429969970	align: 2	alloc type: 0	address: 13849751140618928160

Target:
i64 %b2 = UB triggered!



------------------- SMT STATS -------------------
Num queries: 6
Num invalid: 0
Num skips:   0
Num trivial: 2 (25.0%)
Num timeout: 0 (0.0%)
Num errors:  0 (0.0%)
Num SAT:     6 (100.0%)
Num UNSAT:   0 (0.0%)
Alive2: Transform doesn't verify; aborting!

stderr:

+ : 'RUN: at line 2'
+ /home/nlopes/alive2/build/opt-alive.sh -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -dce -instcombine -S
+ /tmp/nlopes/llvm/build/bin/FileCheck /tmp/nlopes/llvm/llvm/test/Transforms/LoopVectorize/runtime-check.ll

FileCheck error: '<stdin>' is empty.
FileCheck command line:  /tmp/nlopes/llvm/build/bin/FileCheck /tmp/nlopes/llvm/llvm/test/Transforms/LoopVectorize/runtime-check.ll

 

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