Test Failure: Transforms/SimpleLoopUnswitch/nontrivial-unswitch-cost.ll

Test source: git

Log:

Source: <stdin>

----------------------------------------
define void @test_no_unswitch(* %ptr, i1 %cond) {
%entry:
  br label %loop_begin

%loop_begin:
  call void @x()
  call void @x()
  call void @x()
  call void @x()
  br i1 %cond, label %loop_a, label %loop_b

%loop_a:
  call void @a()
  br label %loop_latch

%loop_b:
  call void @b()
  br label %loop_latch

%loop_latch:
  %v = load i1, * %ptr, align 1
  br i1 %v, label %loop_begin, label %loop_exit

%loop_exit:
  ret void
}
=>
define void @test_no_unswitch(* %ptr, i1 %cond) {
%entry:
  br label %loop_begin

%loop_begin:
  call void @x()
  call void @x()
  call void @x()
  call void @x()
  br i1 %cond, label %loop_a, label %loop_b

%loop_a:
  call void @a()
  br label %loop_latch

%loop_b:
  call void @b()
  br label %loop_latch

%loop_latch:
  %v = load i1, * %ptr, align 1
  br i1 %v, label %loop_begin, label %loop_exit

%loop_exit:
  ret void
}
Transformation seems to be correct! (syntactically equal)


----------------------------------------
define void @test_unswitch(* %ptr, i1 %cond) {
%entry:
  br label %loop_begin

%loop_begin:
  call void @x()
  br i1 %cond, label %loop_a, label %loop_b

%loop_a:
  call void @a()
  br label %loop_latch

%loop_b:
  call void @b()
  br label %loop_latch

%loop_latch:
  %v = load i1, * %ptr, align 1
  br i1 %v, label %loop_begin, label %loop_exit

%loop_exit:
  ret void
}
=>
define void @test_unswitch(* %ptr, i1 %cond) {
%entry:
  br i1 %cond, label %entry.split.us, label %entry.split

%entry.split:
  br label %loop_begin

%loop_begin:
  call void @x()
  br label %loop_b

%loop_b:
  call void @b()
  br label %loop_latch

%loop_latch:
  %v = load i1, * %ptr, align 1
  br i1 %v, label %loop_begin, label %loop_exit.split

%loop_exit.split:
  br label %loop_exit

%entry.split.us:
  br label %loop_begin.us

%loop_begin.us:
  call void @x()
  br label %loop_a.us

%loop_a.us:
  call void @a()
  br label %loop_latch.us

%loop_latch.us:
  %v.us = load i1, * %ptr, align 1
  br i1 %v.us, label %loop_begin.us, label %loop_exit.split.us

%loop_exit.split.us:
  br label %loop_exit

%loop_exit:
  ret void
}
Transformation doesn't verify!
ERROR: Source is more defined than target

Example:
* %ptr = poison
i1 %cond = poison

Source:
  >> Jump to %loop_begin
void = UB triggered!

SOURCE MEMORY STATE
===================
NON-LOCAL BLOCKS:
Block 0 >	size: 0	align: 1	alloc type: 0
Block 1 >	align: 8	alloc type: 2
Block 2 >	align: 1	alloc type: 2

Target:
UB triggered on br



------------------- SMT STATS -------------------
Num queries: 5
Num invalid: 0
Num skips:   0
Num trivial: 0 (0.0%)
Num timeout: 0 (0.0%)
Num errors:  0 (0.0%)
Num SAT:     5 (100.0%)
Num UNSAT:   0 (0.0%)
Alive2: Transform doesn't verify; aborting!

stderr:

+ : 'RUN: at line 3'
+ /home/nuno/llvm/build/bin/FileCheck /home/nuno/llvm/llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-cost.ll
+ /home/nuno/alive2/build/opt-alive.sh '-passes=loop(simple-loop-unswitch<nontrivial>),verify<loops>' -unswitch-threshold=5 -S

FileCheck error: '<stdin>' is empty.
FileCheck command line:  /home/nuno/llvm/build/bin/FileCheck /home/nuno/llvm/llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-cost.ll

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