Test Failure: Transforms/CodeGenPrepare/NVPTX/bypass-slow-div-special-cases.ll

Test source: git

Log:

Source: <stdin>

----------------------------------------
define void @Test_no_bypassing(i32 %a, i64 %b, ptr %retptr) {
%0:
  %a.1 = zext i32 %a to i64
  %a.2 = sub i64 -1, %a.1
  %res = srem i64 %a.2, %b
  store i64 %res, ptr %retptr, align 8
  ret void
}
Transformation seems to be correct! (syntactically equal)


----------------------------------------
define void @Test_check_one_operand(i64 %a, i32 %b, ptr %retptr) {
%0:
  %b.1 = zext i32 %b to i64
  %res = sdiv i64 %a, %b.1
  store i64 %res, ptr %retptr, align 8
  ret void
}
=>
define void @Test_check_one_operand(i64 %a, i32 %b, ptr %retptr) {
%0:
  %b.1 = zext i32 %b to i64
  %4 = and i64 %a, -4294967296
  %5 = icmp eq i64 %4, 0
  br i1 %5, label %2, label %1

%1:
  %6 = sdiv i64 %a, %b.1
  br label %3

%2:
  %7 = trunc i64 %b.1 to i32
  %8 = trunc i64 %a to i32
  %9 = udiv i32 %8, %7
  %10 = zext i32 %9 to i64
  br label %3

%3:
  %11 = phi i64 [ %10, %2 ], [ %6, %1 ]
  store i64 %11, ptr %retptr, align 8
  ret void
}
Transformation doesn't verify! (unsound)
ERROR: Source is more defined than target

Example:
i64 %a = poison
i32 %b = #xffffffff (4294967295, -1)
ptr %retptr = pointer(non-local, block_id=1, offset=107)

Source:
i64 %b.1 = #x00000000ffffffff (4294967295)
i64 %res = poison

SOURCE MEMORY STATE
===================
NON-LOCAL BLOCKS:
Block 0 >	size: 0	align: 8	alloc type: 0	address: 0
Block 1 >	size: 128	align: 2	alloc type: 0	address: 5

Target:
i64 %b.1 = #x00000000ffffffff (4294967295)
i64 %4 = poison
i1 %5 = poison
UB triggered on br


Pass: 
Command line: '/home/nlopes/llvm/build/bin/opt' '-load=/home/nlopes/alive2/build/tv/tv.so' '-tv-exit-on-error' '-tv' '-S' '-codegenprepare' '-tv' '-tv-smt-to=20000' '-tv-report-dir=/home/nlopes/alive2/build/logs' '-tv-smt-stats'


------------------- SMT STATS -------------------
Num queries: 4
Num invalid: 0
Num skips:   0
Num trivial: 4 (50.0%)
Num timeout: 0 (0.0%)
Num errors:  0 (0.0%)
Num SAT:     4 (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 -codegenprepare
+ /bitbucket/nlopes/llvm/build/bin/FileCheck /bitbucket/nlopes/llvm/llvm/test/Transforms/CodeGenPrepare/NVPTX/bypass-slow-div-special-cases.ll

FileCheck error: '<stdin>' is empty.
FileCheck command line:  /bitbucket/nlopes/llvm/build/bin/FileCheck /bitbucket/nlopes/llvm/llvm/test/Transforms/CodeGenPrepare/NVPTX/bypass-slow-div-special-cases.ll

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