Test Failure: Transforms/InstCombine/max_known_bits.ll

Test source: git

Log:

Source: <stdin>

----------------------------------------
define i16 @foo(i16 %x) {
%0:
  %t1 = and i16 %x, 255
  %t2 = zext i16 %t1 to i32
  %t3 = icmp ult i32 %t2, 255
  %t4 = select i1 %t3, i32 %t2, i32 255
  %t5 = trunc i32 %t4 to i16
  %t6 = and i16 %t5, 255
  ret i16 %t6
}
=>
define i16 @foo(i16 %x) {
%0:
  %t1 = and i16 %x, 255
  ret i16 %t1
}
Transformation seems to be correct!


----------------------------------------
define i16 @min_max_clamp(i16 %x) {
%0:
  %a = icmp sgt i16 %x, 63488
  %b = select i1 %a, i16 %x, i16 63488
  %c = icmp slt i16 %b, 2047
  %d = select i1 %c, i16 %b, i16 2047
  %e = add i16 %d, 1
  ret i16 %e
}
=>
define i16 @min_max_clamp(i16 %x) {
%0:
  %a = icmp sgt i16 %x, 63488
  %b = select i1 %a, i16 %x, i16 63488
  %c = icmp slt i16 %b, 2047
  %d = select i1 %c, i16 %b, i16 2047
  %e = add nsw i16 %d, 1
  ret i16 %e
}
Transformation doesn't verify!
ERROR: Target is more poisonous than source

Example:
i16 %x = undef

Source:
i1 %a = any
i16 %b = any
i1 %c = any
i16 %d = any
i16 %e = any

Target:
i1 %a = #x1 (1)
i16 %b = #x0000 (0)
i1 %c = #x1 (1)
i16 %d = #x7fff (32767)
i16 %e = poison
Source value: any
Target value: poison


------------------- SMT STATS -------------------
Num queries: 12
Num invalid: 0
Num skips:   0
Num trivial: 5 (29.4%)
Num timeout: 0 (0.0%)
Num errors:  0 (0.0%)
Num SAT:     3 (25.0%)
Num UNSAT:   9 (75.0%)

stderr:

+ : 'RUN: at line 2'
+ /home/nlopes/alive2/build/opt-alive.sh -S -instcombine
+ /home/nlopes/llvm/build/bin/FileCheck --allow-unused-prefixes=false /home/nlopes/llvm/llvm/test/Transforms/InstCombine/max_known_bits.ll

Alive2: Transform doesn't verify; aborting!
FileCheck error: '<stdin>' is empty.
FileCheck command line:  /home/nlopes/llvm/build/bin/FileCheck --allow-unused-prefixes=false /home/nlopes/llvm/llvm/test/Transforms/InstCombine/max_known_bits.ll

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

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