Test Failure: Transforms/LoopStrengthReduce/variable_stride.ll

Test source: git

Log:

Source: <stdin>

----------------------------------------
declare i1 @pred(i32)

define void @test(ptr %P, i32 %STRIDE) {
#0:
  br label %Loop

Loop:
  %INDVAR = phi i32 [ 0, %#0 ], [ %INDVAR2, %Loop ]
  %Idx = mul i32 %INDVAR, %STRIDE
  %cond = call i1 @pred(i32 %Idx)
  %INDVAR2 = add i32 %INDVAR, 1
  br i1 %cond, label %Loop, label %Out

Out:
  ret void
}
=>
declare i1 @pred(i32)

define void @test(ptr %P, i32 %STRIDE) {
#0:
  %#1 = sub i32 0, %STRIDE
  br label %Loop

Loop:
  %lsr.iv = phi i32 [ %lsr.iv.next, %Loop ], [ %#1, %#0 ]
  %lsr.iv.next = add i32 %lsr.iv, %STRIDE
  %cond = call i1 @pred(i32 %lsr.iv.next)
  br i1 %cond, label %Loop, label %Out

Out:
  ret void
}
Transformation doesn't verify! (unsound)
ERROR: Source is more defined than target

Example:
ptr %P = poison
i32 %STRIDE = undef

Source:
  >> Jump to %Loop
i32 %INDVAR = #x00000000 (0)
i32 %Idx = #x00000000 (0)
i1 %cond = function did not return!

SOURCE MEMORY STATE
===================
NON-LOCAL BLOCKS:
Block 0 >	size: 0	align: 1	alloc type: 0	alive: false	address: #x0
Block 1 >	size: 0	align: 1	alloc type: 0	alive: true	address: #x1
Block 2 >	size: 0	align: 8	alloc type: 0	alive: true	address: #x8

Target:
i32 %#1 = #xffffffff (4294967295, -1)
  >> Jump to %Loop
i32 %lsr.iv = #xffffffff (4294967295, -1)
i32 %lsr.iv.next = #xffffffff (4294967295, -1)
i1 %cond = function did not return!

TARGET MEMORY STATE
===================
NON-LOCAL BLOCKS:
Block 0 >	size: 0	align: 1	alloc type: 0	alive: false	address: #x0
Block 1 >	size: 0	align: 1	alloc type: 0	alive: true	address: #x1
Block 2 >	size: 0	align: 8	alloc type: 0	alive: true	address: #x8


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


------------------- SMT STATS -------------------
Num queries: 23
Num invalid: 0
Num skips:   0
Num trivial: 6 (20.7%)
Num timeout: 0 (0.0%)
Num errors:  0 (0.0%)
Num SAT:     21 (91.3%)
Num UNSAT:   2 (8.7%)
Alive2: Transform doesn't verify; aborting!

stderr:

Transforms/LoopStrengthReduce/variable_stride.ll' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/home/nlopes/alive2/build/opt-alive.sh < /bitbucket/nlopes/llvm/llvm/test/Transforms/LoopStrengthReduce/variable_stride.ll -loop-reduce -S | /bitbucket/nlopes/llvm/build/bin/not grep mul
# executed command: /home/nlopes/alive2/build/opt-alive.sh -loop-reduce -S
# .---command stderr------------
# `-----------------------------
# error: command failed with exit status: 1
# executed command: /bitbucket/nlopes/llvm/build/bin/not grep mul

--

NOTE: This test would pass if undef didn't exist!

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