Test Failure: Transforms/ExpandMemCmp/X86/bcmp.ll

Test source: git

Comments: LLVM bug: load widening of i8 -> i64

Log:

Source: <stdin>

----------------------------------------
define i32 @bcmp8(ptr nocapture nowrite %x, ptr nocapture nowrite %y) {
%0:
  %call = call i32 @bcmp(nocapture ptr nocapture nowrite %x, nocapture ptr nocapture nowrite %y, i64 8)
  ret i32 %call
}
=>
define i32 @bcmp8(ptr nocapture nowrite %x, ptr nocapture nowrite %y) {
%0:
  %1 = load i64, ptr nocapture nowrite %x, align 1
  %2 = load i64, ptr nocapture nowrite %y, align 1
  %3 = icmp ne i64 %1, %2
  %4 = zext i1 %3 to i32
  ret i32 %4
}
Transformation doesn't verify! (unsound)
ERROR: Source is more defined than target

Example:
ptr nocapture nowrite %x = poison
ptr nocapture nowrite %y = poison

Source:
i32 %call = UB triggered!

SOURCE MEMORY STATE
===================
NON-LOCAL BLOCKS:
Block 0 >	size: 0	align: 1	alloc type: 0
Block 1 >	align: 2	alloc type: 0
Block 2 >	align: 65536	alloc type: 0
Block 3 >	align: 2	alloc type: 0

Target:
i64 %1 = UB triggered!


Pass: 
Command line: '/home/nlopes/llvm/build/bin/opt' '-load=/home/nlopes/alive2/build/tv/tv.so' '-tv-exit-on-error' '-tv' '-S' '-expandmemcmp' '-memcmp-num-loads-per-block=1' '-mtriple=x86_64-unknown-unknown' '-data-layout=e-m:o-i64:64-f80:128-n8:16:32:64-S128' '-tv' '-tv-smt-to=20000' '-tv-report-dir=/home/nlopes/alive2/build/logs' '-tv-smt-stats'


------------------- SMT STATS -------------------
Num queries: 6
Num invalid: 0
Num skips:   0
Num trivial: 0 (0.0%)
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 -S -expandmemcmp -memcmp-num-loads-per-block=1 -mtriple=x86_64-unknown-unknown -data-layout=e-m:o-i64:64-f80:128-n8:16:32:64-S128
+ /bitbucket/nlopes/llvm/build/bin/FileCheck /bitbucket/nlopes/llvm/llvm/test/Transforms/ExpandMemCmp/X86/bcmp.ll --check-prefix=X64

FileCheck error: '<stdin>' is empty.
FileCheck command line:  /bitbucket/nlopes/llvm/build/bin/FileCheck /bitbucket/nlopes/llvm/llvm/test/Transforms/ExpandMemCmp/X86/bcmp.ll --check-prefix=X64

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