Test Failure: Transforms/CorrelatedValuePropagation/cond-at-use.ll

Test source: git

Log:

Source: <stdin>
-- 1. ModuleToFunctionPassAdaptor
-- 1. PassManager<Function> : Skipping NOP
-- 2. CorrelatedValuePropagationPass

----------------------------------------
define i16 @sel_true_cond(i16 %x) {
%0:
  %sub = usub_sat i16 %x, 10
  %cmp = icmp uge i16 %x, 10
  %sel = select i1 %cmp, i16 %sub, i16 42
  ret i16 %sel
}
Transformation seems to be correct! (syntactically equal)

-- 3. CorrelatedValuePropagationPass

----------------------------------------
define i16 @sel_true_cond(i16 %x) {
%0:
  %sub = usub_sat i16 %x, 10
  %cmp = icmp uge i16 %x, 10
  %sel = select i1 %cmp, i16 %sub, i16 42
  ret i16 %sel
}
=>
define i16 @sel_true_cond(i16 %x) {
%0:
  %sub1 = sub nuw i16 %x, 10
  %cmp = icmp uge i16 %x, 10
  %sel = select i1 %cmp, i16 %sub1, i16 42
  ret i16 %sel
}
Transformation doesn't verify! (unsound)
ERROR: Target is more poisonous than source

Example:
i16 %x = undef

Source:
i16 %sub = #x0000 (0)	[based on undef value]
i1 %cmp = #x0 (0)	[based on undef value]
i16 %sel = #x002a (42)

Target:
i16 %sub1 = poison
i1 %cmp = #x1 (1)
i16 %sel = poison
Source value: #x002a (42)
Target value: poison

Pass: CorrelatedValuePropagationPass
Command line: '/home/nlopes/llvm/build/bin/opt' '-load=/home/nlopes/alive2/build/tv/tv.so' '-load-pass-plugin=/home/nlopes/alive2/build/tv/tv.so' '-tv-exit-on-error' '-S' '-passes=correlated-propagation' '-tv-smt-to=20000' '-tv-report-dir=/home/nlopes/alive2/build/logs' '-tv-smt-stats'
Wrote bitcode to: "/home/nlopes/alive2/build/logs/in_XykVXMm1_BpQz.bc"


------------------- SMT STATS -------------------
Num queries: 4
Num invalid: 0
Num skips:   0
Num trivial: 8 (66.7%)
Num timeout: 0 (0.0%)
Num errors:  0 (0.0%)
Num SAT:     4 (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 -S -passes=correlated-propagation
+ /bitbucket/nlopes/llvm/build/bin/FileCheck /bitbucket/nlopes/llvm/llvm/test/Transforms/CorrelatedValuePropagation/cond-at-use.ll

FileCheck error: '<stdin>' is empty.
FileCheck command line:  /bitbucket/nlopes/llvm/build/bin/FileCheck /bitbucket/nlopes/llvm/llvm/test/Transforms/CorrelatedValuePropagation/cond-at-use.ll

NOTE: This test would pass if undef didn't exist!

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