| Issue |
134013
|
| Summary |
crash in slp vectorizer after "[SLP]Fix a check for the whole register use"
|
| Labels |
llvm:SLPVectorizer,
crash-on-valid
|
| Assignees |
alexey-bataev
|
| Reporter |
macurtis-amd
|
After applying [bfd8cc0a3e82](https://github.com/llvm/llvm-project/commit/bfd8cc0a3e82), I am seeing a crash in SLPVectorize.cpp.
Reproducer:
```
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define <2 x float> @foo() {
entry:
br label %do.body
do.body: ; preds = %do.body, %entry
%val.sroa.66.0 = phi float [ 0.000000e+00, %entry ], [ %val.sroa.66.1, %do.body ]
%val.sroa.60.0 = phi float [ 0.000000e+00, %entry ], [ %val.sroa.60.2, %do.body ]
%val.sroa.54.0 = phi float [ 0.000000e+00, %entry ], [ %val.sroa.54.2, %do.body ]
%val.sroa.48.0 = phi float [ 0.000000e+00, %entry ], [ %val.sroa.48.2, %do.body ]
%val.sroa.42.0 = phi float [ 0.000000e+00, %entry ], [ %val.sroa.42.2, %do.body ]
%val.sroa.36.0 = phi float [ 0.000000e+00, %entry ], [ %val.sroa.36.2, %do.body ]
%val.sroa.30.0 = phi float [ 0.000000e+00, %entry ], [ %val.sroa.30.2, %do.body ]
%val.sroa.24.0 = phi float [ 0.000000e+00, %entry ], [ %val.sroa.24.2, %do.body ]
%val.sroa.18.0 = phi float [ 0.000000e+00, %entry ], [ %val.sroa.18.2, %do.body ]
%val.sroa.12.0 = phi float [ 0.000000e+00, %entry ], [ %val.sroa.12.2, %do.body ]
%val.sroa.6.0 = phi float [ 0.000000e+00, %entry ], [ %val.sroa.6.2, %do.body ]
%val.sroa.0.0 = phi float [ 0.000000e+00, %entry ], [ %val.sroa.0.1, %do.body ]
%cmp119 = fcmp uge float 0.000000e+00, 0.000000e+00
%val.sroa.6.1 = select i1 %cmp119, float 0.000000e+00, float 0.000000e+00
%val.sroa.0.1 = select i1 %cmp119, float 0.000000e+00, float 0.000000e+00
%cmp119.1 = fcmp uge float %val.sroa.6.1, 0.000000e+00
%val.sroa.6.2 = select i1 %cmp119.1, float 0.000000e+00, float 0.000000e+00
%cmp119.2 = fcmp uge float 0.000000e+00, 0.000000e+00
%val.sroa.12.2 = select i1 %cmp119.2, float 0.000000e+00, float 0.000000e+00
%cmp119.3 = fcmp uge float 0.000000e+00, 0.000000e+00
%val.sroa.18.2 = select i1 %cmp119.3, float 0.000000e+00, float 0.000000e+00
%cmp119.4 = fcmp uge float 0.000000e+00, 0.000000e+00
%val.sroa.24.2 = select i1 %cmp119.4, float 0.000000e+00, float 0.000000e+00
%cmp119.5 = fcmp uge float 0.000000e+00, 0.000000e+00
%val.sroa.30.2 = select i1 %cmp119.5, float 0.000000e+00, float 0.000000e+00
%cmp119.6 = fcmp uge float 0.000000e+00, 0.000000e+00
%val.sroa.36.2 = select i1 %cmp119.6, float 0.000000e+00, float 0.000000e+00
%cmp119.7 = fcmp uge float 0.000000e+00, 0.000000e+00
%val.sroa.42.2 = select i1 %cmp119.7, float 0.000000e+00, float 0.000000e+00
%cmp119.8 = fcmp uge float 0.000000e+00, 0.000000e+00
%val.sroa.48.2 = select i1 %cmp119.8, float 0.000000e+00, float 0.000000e+00
%cmp119.9 = fcmp uge float 0.000000e+00, 0.000000e+00
%val.sroa.54.2 = select i1 %cmp119.9, float 0.000000e+00, float 0.000000e+00
%cmp119.10 = fcmp uge float 0.000000e+00, 0.000000e+00
%val.sroa.66.1 = select i1 %cmp119.10, float 0.000000e+00, float 0.000000e+00
%val.sroa.60.2 = select i1 %cmp119.10, float 0.000000e+00, float 0.000000e+00
br label %do.body
}
```
Crash is occurring on [SLPVectorizer.cpp:16251](https://github.com/llvm/llvm-project/blob/ad1ca5f4a2bc09f99fd82e5444f5da37c2985e97/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp#L16251).
At the time `VF:12` and `Scalars.size():16`.
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