Test Failure: Transforms/InstCombine/invert-variable-mask-in-masked-merge-scalar.ll

Test source: git

Log:

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

----------------------------------------
define i4 @scalar(i4 %x, i4 %y, i4 %m) {
%0:
  %im = xor i4 %m, 15
  %n0 = xor i4 %x, %y
  %n1 = and i4 %n0, %im
  %r = xor i4 %n1, %y
  ret i4 %r
}
Transformation seems to be correct! (syntactically equal)

-- 3. InstCombinePass

----------------------------------------
define i4 @scalar(i4 %x, i4 %y, i4 %m) {
%0:
  %im = xor i4 %m, 15
  %n0 = xor i4 %x, %y
  %n1 = and i4 %n0, %im
  %r = xor i4 %n1, %y
  ret i4 %r
}
=>
define i4 @scalar(i4 %x, i4 %y, i4 %m) {
%0:
  %n0 = xor i4 %x, %y
  %1 = and i4 %n0, %m
  %r = xor i4 %1, %x
  ret i4 %r
}
Transformation doesn't verify! (unsound)
ERROR: Target's return value is more undefined

Example:
i4 %x = undef
i4 %y = #x4 (4)
i4 %m = #xf (15, -1)

Source:
i4 %im = #x0 (0)
i4 %n0 = #x4 (4)	[based on undef value]
i4 %n1 = #x0 (0)
i4 %r = #x4 (4)

Target:
i4 %n0 = #xc (12, -4)
i4 %1 = #xc (12, -4)
i4 %r = #x8 (8, -8)
Source value: #x4 (4)
Target value: #x8 (8, -8)

Pass: InstCombinePass
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' '-passes=instcombine' '-S' '-tv-smt-to=20000' '-tv-report-dir=/home/nlopes/alive2/build/logs' '-tv-smt-stats'


------------------- SMT STATS -------------------
Num queries: 5
Num invalid: 0
Num skips:   0
Num trivial: 14 (73.7%)
Num timeout: 0 (0.0%)
Num errors:  0 (0.0%)
Num SAT:     4 (80.0%)
Num UNSAT:   1 (20.0%)
Alive2: Transform doesn't verify; aborting!

stderr:

+ : 'RUN: at line 2'
+ /home/nlopes/alive2/build/opt-alive.sh -passes=instcombine -S
+ /bitbucket/nlopes/llvm/build/bin/FileCheck /bitbucket/nlopes/llvm/llvm/test/Transforms/InstCombine/invert-variable-mask-in-masked-merge-scalar.ll

FileCheck error: '<stdin>' is empty.
FileCheck command line:  /bitbucket/nlopes/llvm/build/bin/FileCheck /bitbucket/nlopes/llvm/llvm/test/Transforms/InstCombine/invert-variable-mask-in-masked-merge-scalar.ll

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

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