| Issue |
179671
|
| Summary |
[LV] `replicateByVF` attempts to remove recipes that still have users
|
| Labels |
vectorizers
|
| Assignees |
|
| Reporter |
MacDue
|
The following IR:
```llvm
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128-Fn32"
target triple = "aarch64-unknown-linux-gnu"
; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.objectsize.i64.p0(ptr, i1 immarg, i1 immarg, i1 immarg) #0
; Function Attrs: nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none)
declare { i32, i1 } @llvm.sadd.with.overflow.i32(i32, i32) #1
define void @_ZN8kdu_core18kdu_cplex_analysis21allocate_record_blockEv(ptr align 8 dereferenceable(120) %0, i1 %1) {
br label %3
3: ; preds = %17, %2
%.0 = phi ptr [ null, %2 ], [ %6, %17 ]
br i1 %1, label %5, label %4
4: ; preds = %3
ret void
5: ; preds = %3
%6 = getelementptr i8, ptr %.0, i64 128
%7 = getelementptr i8, ptr %0, i64 24
%8 = load ptr, ptr %7, align 8
store ptr %8, ptr %.0, align 8
%9 = call i64 @llvm.objectsize.i64.p0(ptr %0, i1 false, i1 false, i1 false)
%.not = icmp eq i64 %9, 0
br i1 %.not, label %10, label %11
10: ; preds = %5
store volatile i32 0, ptr null, align 4
unreachable
11: ; preds = %5
store ptr %.0, ptr %7, align 8
%12 = getelementptr i8, ptr %0, i64 40
%13 = load i32, ptr %12, align 8
%14 = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %13, i32 1)
%15 = extractvalue { i32, i1 } %14, 1
br i1 %15, label %16, label %17
16: ; preds = %11
store volatile i32 0, ptr null, align 4
unreachable
17: ; preds = %11
%18 = extractvalue { i32, i1 } %14, 0
store i32 %18, ptr %12, align 8
br label %3
}
attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #1 = { nocallback nocreateundeforpoison nofree nosync nounwind speculatable willreturn memory(none) }
```
When compiled with clang `-O2 --target=aarch64-unknown-linux-gnu -c -o /dev/null` leads to: `trying to delete a VPRecipeValue with remaining users` in `replicateByVF`.
See: https://godbolt.org/z/qbv5P9zv4
Reported by @joanahalili: https://github.com/llvm/llvm-project/pull/174835#issuecomment-3844233831
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