Test source: git
Comments: LLVM bug: load widening of i8 -> i16
Source: <stdin>
----------------------------------------
define i32 @cmp2(ptr nocapture nowrite %x, ptr nocapture nowrite %y) {
%0:
%call = memcmp ptr nocapture nowrite %x, ptr nocapture nowrite %y, i32 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' '-mtriple=i686-unknown-unknown' '-data-layout=e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-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!
+ : 'RUN: at line 2' + /home/nlopes/alive2/build/opt-alive.sh -S -expandmemcmp -mtriple=i686-unknown-unknown -data-layout=e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128 + /bitbucket/nlopes/llvm/build/bin/FileCheck /bitbucket/nlopes/llvm/llvm/test/Transforms/ExpandMemCmp/X86/memcmp-x32.ll --check-prefix=X32 FileCheck error: '<stdin>' is empty. FileCheck command line: /bitbucket/nlopes/llvm/build/bin/FileCheck /bitbucket/nlopes/llvm/llvm/test/Transforms/ExpandMemCmp/X86/memcmp-x32.ll --check-prefix=X32