Test Failure: Transforms/MergeICmps/X86/no-gep-other-work.ll

Test source: git

Comments: LLVM PR51845

Log:

Source: <stdin>
-- 1. ModuleToFunctionPassAdaptor
-- 1. PassManager<Function> : Skipping NOP
-- 2. MergeICmpsPass

----------------------------------------
declare void @other_work()

define i1 @test(ptr dereferenceable(2) %arg, ptr dereferenceable(2) %arg1) {
entry:
  call void @other_work()
  %arg.off = gep inbounds ptr dereferenceable(2) %arg, 1 x i64 1
  %arg1.off = gep inbounds ptr dereferenceable(2) %arg1, 1 x i64 1
  %arg.off.val = load i8, ptr %arg.off, align 1
  %arg1.off.val = load i8, ptr %arg1.off, align 1
  %cmp.off = icmp eq i8 %arg.off.val, %arg1.off.val
  br i1 %cmp.off, label %if, label %join

if:
  %arg.val = load i8, ptr dereferenceable(2) %arg, align 1
  %arg1.val = load i8, ptr dereferenceable(2) %arg1, align 1
  %cmp = icmp eq i8 %arg.val, %arg1.val
  br label %join

join:
  %phi = phi i1 [ 0, %entry ], [ %cmp, %if ]
  ret i1 %phi
}
Transformation seems to be correct! (syntactically equal)

-- 3. MergeICmpsPass

----------------------------------------
declare void @other_work()

define i1 @test(ptr dereferenceable(2) %arg, ptr dereferenceable(2) %arg1) {
entry:
  call void @other_work()
  %arg.off = gep inbounds ptr dereferenceable(2) %arg, 1 x i64 1
  %arg1.off = gep inbounds ptr dereferenceable(2) %arg1, 1 x i64 1
  %arg.off.val = load i8, ptr %arg.off, align 1
  %arg1.off.val = load i8, ptr %arg1.off, align 1
  %cmp.off = icmp eq i8 %arg.off.val, %arg1.off.val
  br i1 %cmp.off, label %if, label %join

if:
  %arg.val = load i8, ptr dereferenceable(2) %arg, align 1
  %arg1.val = load i8, ptr dereferenceable(2) %arg1, align 1
  %cmp = icmp eq i8 %arg.val, %arg1.val
  br label %join

join:
  %phi = phi i1 [ 0, %entry ], [ %cmp, %if ]
  ret i1 %phi
}
=>
declare void @other_work()
declare i32 @memcmp(nocapture ptr, nocapture ptr, i64) nofree willreturn memory(argmem: read)

define i1 @test(ptr dereferenceable(2) %arg, ptr dereferenceable(2) %arg1) {
if+entry:
  call void @other_work()
  %memcmp = memcmp ptr dereferenceable(2) %arg, ptr dereferenceable(2) %arg1, i64 2
  %#0 = icmp eq i32 %memcmp, 0
  br label %join

join:
  ret i1 %#0
}
Transformation doesn't verify! (unsound)
ERROR: Target is more poisonous than source

Example:
ptr dereferenceable(2) %arg = pointer(non-local, block_id=1, offset=2)
ptr dereferenceable(2) %arg1 = pointer(non-local, block_id=2, offset=2)

Source:
Function @other_work returned
ptr %arg.off = pointer(non-local, block_id=1, offset=3)
ptr %arg1.off = pointer(non-local, block_id=2, offset=3)
i8 %arg.off.val = #x01 (1)
i8 %arg1.off.val = #x00 (0)
i1 %cmp.off = #x0 (0)
  >> Jump to %join
i1 %phi = #x0 (0)

SOURCE MEMORY STATE
===================
NON-LOCAL BLOCKS:
Block 0 >	size: 0	align: 1	alloc type: 0	alive: false	address: 0
Block 1 >	size: 8	align: 1	alloc type: 0	alive: true	address: 7
Block 2 >	size: 4	align: 1	alloc type: 0	alive: true	address: 2
Block 3 >	size: 1	align: 1	alloc type: 0	alive: true	address: 7

Target:
Function @other_work returned
i32 %memcmp = poison
i1 %#0 = poison
  >> Jump to %join
Source value: #x0 (0)
Target value: poison

Pass: MergeICmpsPass
Command line: '/home/nlopes/llvm/build/bin/opt' '-load=/home/nlopes/alive2/build/tv/tv.so' '-load-pass-plugin=/home/nlopes/alive2/build/tv/tv.so' '-tv-exit-on-error' '-S' '-passes=mergeicmps' '-tv-smt-to=20000' '-tv-report-dir=/home/nlopes/alive2/build/logs' '-tv-smt-stats'
Wrote bitcode to: "/home/nlopes/alive2/build/logs/in_q2Bfzmtf_31l8.bc"


------------------- SMT STATS -------------------
Num queries: 31
Num invalid: 0
Num skips:   0
Num trivial: 9 (22.5%)
Num timeout: 0 (0.0%)
Num errors:  0 (0.0%)
Num SAT:     19 (61.3%)
Num UNSAT:   12 (38.7%)
Alive2: Transform doesn't verify; aborting!

stderr:

RUN: at line 2: /home/nlopes/alive2/build/opt-alive.sh -S -passes=mergeicmps < /bitbucket/nlopes/llvm/llvm/test/Transforms/MergeICmps/X86/no-gep-other-work.ll | /bitbucket/nlopes/llvm/build/bin/FileCheck /bitbucket/nlopes/llvm/llvm/test/Transforms/MergeICmps/X86/no-gep-other-work.ll
+ /home/nlopes/alive2/build/opt-alive.sh -S -passes=mergeicmps
+ /bitbucket/nlopes/llvm/build/bin/FileCheck /bitbucket/nlopes/llvm/llvm/test/Transforms/MergeICmps/X86/no-gep-other-work.ll

FileCheck error: '<stdin>' is empty.
FileCheck command line:  /bitbucket/nlopes/llvm/build/bin/FileCheck /bitbucket/nlopes/llvm/llvm/test/Transforms/MergeICmps/X86/no-gep-other-work.ll

<-- Back