Test Failure: Transforms/GVN/pr24397.ll

Test source: git

Comments: LLVM bug: introduces load type punning

Log:

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

----------------------------------------
define i64 @foo(ptr %arrayidx) {
entry:
  %p = load ptr, ptr %arrayidx, align 8
  %cmpnull = icmp eq ptr %p, null
  br label %BB2

entry2:
  br label %BB2

BB2:
  %load = load i64, ptr %arrayidx, align 8
  ret i64 %load
}
Transformation seems to be correct! (syntactically equal)

-- 3. GVNPass

----------------------------------------
define i64 @foo(ptr %arrayidx) {
entry:
  %p = load ptr, ptr %arrayidx, align 8
  br label %BB2

BB2:
  %load = load i64, ptr %arrayidx, align 8
  ret i64 %load
}
=>
define i64 @foo(ptr %arrayidx) {
entry:
  %p = load ptr, ptr %arrayidx, align 8
  %#0 = ptrtoint ptr %p to i64
  br label %BB2

BB2:
  ret i64 %#0
}
Transformation doesn't verify! (unsound)
ERROR: Target is more poisonous than source

Example:
ptr %arrayidx = pointer(non-local, block_id=1, offset=0) / Address=#x0000000000000008

Source:
ptr %p = poison
  >> Jump to %BB2
i64 %load = #x0800000000000000 (576460752303423488)

SOURCE MEMORY STATE
===================
NON-LOCAL BLOCKS:
Block 0 >	size: 0	align: 8	alloc type: 0	alive: false	address: 0
Block 1 >	size: 8	align: 8	alloc type: 0	alive: true	address: 8
Contents:
*: #x0800000000000000

Block 2 >	size: 7	align: 1	alloc type: 0	alive: true	address: 1
Contents:
*: #x0800000000000000


Target:
ptr %p = poison
i64 %#0 = poison
  >> Jump to %BB2
Source value: #x0800000000000000 (576460752303423488)
Target value: poison

Pass: GVNPass
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' '-passes=gvn' '-disable-output' '-tv-smt-to=20000' '-tv-report-dir=/home/nlopes/alive2/build/logs' '-tv-smt-stats'
Wrote bitcode to: "/home/nlopes/alive2/build/logs/in_CwtfiOs7_7iN5.bc"


------------------- SMT STATS -------------------
Num queries: 29
Num invalid: 0
Num skips:   0
Num trivial: 5 (14.7%)
Num timeout: 0 (0.0%)
Num errors:  0 (0.0%)
Num SAT:     19 (65.5%)
Num UNSAT:   10 (34.5%)
Alive2: Transform doesn't verify; aborting!

stderr:

RUN: at line 1: /home/nlopes/alive2/build/opt-alive.sh -passes=gvn -disable-output < /bitbucket/nlopes/llvm/llvm/test/Transforms/GVN/pr24397.ll
+ /home/nlopes/alive2/build/opt-alive.sh -passes=gvn -disable-output

<-- Back