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

Test source: git

Comments: LLVM bug: load widening of i8 -> i16

Log:

Source: <stdin>

----------------------------------------
define i32 @cmp2(ptr nocapture nowrite %x, ptr nocapture nowrite %y) {
%0:
  %call = memcmp ptr nocapture nowrite %x, ptr nocapture nowrite %y, i64 2
  ret i32 %call
}
=>
define i32 @cmp2(ptr nocapture nowrite %x, ptr nocapture nowrite %y) {
%0:
  %1 = load i16, ptr nocapture nowrite %x, align 1
  %2 = load i16, ptr nocapture nowrite %y, align 1
  %3 = bswap i16 %1
  %4 = bswap i16 %2
  %5 = zext i16 %3 to i32
  %6 = zext i16 %4 to i32
  %7 = sub i32 %5, %6
  ret i32 %7
}
Transformation doesn't verify! (unsound)
ERROR: Target is more poisonous than source

Example:
ptr nocapture nowrite %x = pointer(non-local, block_id=1, offset=0, attrs=3)
ptr nocapture nowrite %y = pointer(non-local, block_id=1, offset=0, attrs=3)

Source:
i32 %call = #x00000000 (0)

SOURCE MEMORY STATE
===================
NON-LOCAL BLOCKS:
Block 0 >	size: 0	align: 1	alloc type: 0	address: 0
Block 1 >	size: 8	align: 2	alloc type: 0	address: 4
Block 2 >	size: 0	align: 2	alloc type: 0	address: 12

Target:
i16 %1 = poison
i16 %2 = poison
i16 %3 = poison
i16 %4 = poison
i32 %5 = poison
i32 %6 = poison
i32 %7 = poison
Source value: #x00000000 (0)
Target value: poison

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: 5
Num invalid: 0
Num skips:   0
Num trivial: 5 (50.0%)
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 -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/memcmp.ll --check-prefix=X64 --check-prefix=X64_1LD

FileCheck error: '<stdin>' is empty.
FileCheck command line:  /bitbucket/nlopes/llvm/build/bin/FileCheck /bitbucket/nlopes/llvm/llvm/test/Transforms/ExpandMemCmp/X86/memcmp.ll --check-prefix=X64 --check-prefix=X64_1LD

<-- Back