Test Failure: Transforms/GVN/loadpre-missed-opportunity.ll

Test source: git

Log:

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

----------------------------------------
declare i32 @use(ptr) nofree memory(none)
declare void @somecall()
declare i1 @cond() nofree memory(none)

define i32 @loadpre_opportunity(ptr %arg, i1 %arg1, i1 %arg2, i1 %arg3) {
bb:
  %i = load ptr, ptr %arg, align 8
  br label %bb5

bb5:
  %i6 = call i32 @use(ptr %i) nofree memory(none)
  br label %bb11

bb11:
  %i12 = phi i32 [ %i6, %bb5 ], [ %i10, %bb7 ]
  br i1 %arg1, label %bb7, label %bb13

bb13:
  call void @somecall()
  br i1 %arg2, label %bb14, label %bb17

bb14:
  br label %bb15

bb15:
  br i1 %arg3, label %bb16, label %bb15

bb16:
  br label %bb17

bb17:
  %i18 = call i1 @cond() nofree memory(none)
  br i1 %i18, label %bb7, label %bb19

bb7:
  %i8 = load ptr, ptr %arg, align 8
  %i10 = call i32 @use(ptr %i8) nofree memory(none)
  br label %bb11

bb19:
  ret i32 %i12
}
Transformation seems to be correct! (syntactically equal)

-- 3. GVNPass

----------------------------------------
declare i32 @use(ptr) nofree memory(none)
declare void @somecall()
declare i1 @cond() nofree memory(none)

define i32 @loadpre_opportunity(ptr %arg, i1 %arg1, i1 %arg2, i1 %arg3) {
bb:
  %i = load ptr, ptr %arg, align 8
  br label %bb5

bb5:
  %i6 = call i32 @use(ptr %i) nofree memory(none)
  br label %bb11

bb11:
  %i12 = phi i32 [ %i6, %bb5 ], [ %i10, %bb7 ]
  br i1 %arg1, label %bb7, label %bb13

bb13:
  call void @somecall()
  br i1 %arg2, label %bb14, label %bb17

bb14:
  br label %bb15

bb15:
  br i1 %arg3, label %bb16, label %bb15

bb16:
  br label %bb17

bb17:
  %i18 = call i1 @cond() nofree memory(none)
  br i1 %i18, label %bb7, label %bb19

bb7:
  %i8 = load ptr, ptr %arg, align 8
  %i10 = call i32 @use(ptr %i8) nofree memory(none)
  br label %bb11

bb19:
  ret i32 %i12
}
=>
declare i32 @use(ptr) nofree memory(none)
declare void @somecall()
declare i1 @cond() nofree memory(none)

define i32 @loadpre_opportunity(ptr %arg, i1 %arg1, i1 %arg2, i1 %arg3) {
bb:
  %i = load ptr, ptr %arg, align 8
  %i6 = call i32 @use(ptr %i) nofree memory(none)
  br label %bb11

bb11:
  %i81 = phi ptr [ %i, %bb ], [ %i8, %bb7 ]
  %i12 = phi i32 [ %i6, %bb ], [ %i10, %bb7 ]
  br i1 %arg1, label %bb7, label %bb13

bb13:
  call void @somecall()
  br i1 %arg2, label %bb14, label %bb17

bb14:
  br label %bb15

bb15:
  br i1 %arg3, label %bb16, label %bb15

bb16:
  br label %bb17

bb17:
  %i18 = call i1 @cond() nofree memory(none)
  br i1 %i18, label %bb17.bb7_crit_edge, label %bb19

bb17.bb7_crit_edge:
  %i8.pre = load ptr, ptr %arg, align 8
  br label %bb7

bb7:
  %i8 = phi ptr [ %i8.pre, %bb17.bb7_crit_edge ], [ %i81, %bb11 ]
  %i10 = call i32 @use(ptr %i8) nofree memory(none)
  br label %bb11

bb19:
  ret i32 %i12
}
Transformation doesn't verify! (unsound)
ERROR: Source is more defined than target

Example:
ptr %arg = pointer(non-local, block_id=1, offset=0)
i1 %arg1 = #x0 (0)
i1 %arg2 = #x0 (0)
i1 %arg3 = #x0 (0)

Source:
ptr %i = pointer(non-local, block_id=2, offset=1)
  >> Jump to %bb5
i32 %i6 = #x00000000 (0)
  >> Jump to %bb11
i32 %i12 = #x00000000 (0)
  >> Jump to %bb13
Function @somecall returned
  >> Jump to %bb17
i1 %i18 = #x1 (1)
  >> Jump to %bb7
ptr %i8 = pointer(non-local, block_id=2, offset=64)
i32 %i10 = function did not return!

SOURCE MEMORY STATE
===================
NON-LOCAL BLOCKS:
Block 0 >	size: 0	align: 8	alloc type: 0	alive: false	address: 0
Block 1 >	size: 8	align: 2	alloc type: 0	alive: true	address: 8
Contents:
*: pointer(non-local, block_id=2, offset=1), byte offset=0

Block 2 >	size: 1	align: 8	alloc type: 2	alive: false	address: 16
Contents:
*: pointer(non-local, block_id=2, offset=1), byte offset=0

Block 3 >	size: 2	align: 8	alloc type: 2	alive: true
Contents:
*: pointer(non-local, block_id=2, offset=1), byte offset=0


Target:
ptr %i = pointer(non-local, block_id=2, offset=1)
i32 %i6 = #x00000000 (0)
UB triggered on br


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' '-gvn-max-block-speculations=1' '-S' '-tv-smt-to=20000' '-tv-report-dir=/home/nlopes/alive2/build/logs' '-tv-smt-stats'
Wrote bitcode to: "/home/nlopes/alive2/build/logs/in_96DTvIsy_4epc.bc"


------------------- SMT STATS -------------------
Num queries: 48
Num invalid: 0
Num skips:   0
Num trivial: 11 (18.6%)
Num timeout: 0 (0.0%)
Num errors:  0 (0.0%)
Num SAT:     34 (70.8%)
Num UNSAT:   14 (29.2%)
Alive2: Transform doesn't verify; aborting!

stderr:

RUN: at line 2: /home/nlopes/alive2/build/opt-alive.sh < /bitbucket/nlopes/llvm/llvm/test/Transforms/GVN/loadpre-missed-opportunity.ll -passes=gvn -gvn-max-block-speculations=1 -S | /bitbucket/nlopes/llvm/build/bin/FileCheck -check-prefix=PRE /bitbucket/nlopes/llvm/llvm/test/Transforms/GVN/loadpre-missed-opportunity.ll
+ /bitbucket/nlopes/llvm/build/bin/FileCheck -check-prefix=PRE /bitbucket/nlopes/llvm/llvm/test/Transforms/GVN/loadpre-missed-opportunity.ll
+ /home/nlopes/alive2/build/opt-alive.sh -passes=gvn -gvn-max-block-speculations=1 -S

FileCheck error: '<stdin>' is empty.
FileCheck command line:  /bitbucket/nlopes/llvm/build/bin/FileCheck -check-prefix=PRE /bitbucket/nlopes/llvm/llvm/test/Transforms/GVN/loadpre-missed-opportunity.ll

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