<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/54165>54165</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
[MLIR][OpenMP] Incorrect LLVM lowering
</td>
</tr>
<tr>
<th>Labels</th>
<td>
new issue
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
wsmoses
</td>
</tr>
</table>
<pre>
```mlir
module attributes {dlti.dl_spec = #dlti.dl_spec<#dlti.dl_entry<"dlti.endianness", "little">, #dlti.dl_entry<i64, dense<64> : vector<2xi32>>, #dlti.dl_entry<f80, dense<128> : vector<2xi32>>, #dlti.dl_entry<i1, dense<8> : vector<2xi32>>, #dlti.dl_entry<i8, dense<8> : vector<2xi32>>, #dlti.dl_entry<i16, dense<16> : vector<2xi32>>, #dlti.dl_entry<i32, dense<32> : vector<2xi32>>, #dlti.dl_entry<f16, dense<16> : vector<2xi32>>, #dlti.dl_entry<f64, dense<64> : vector<2xi32>>, #dlti.dl_entry<f128, dense<128> : vector<2xi32>>>, llvm.data_layout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128", llvm.target_triple = "x86_64-unknown-linux-gnu"} {
llvm.func @printf(!llvm.ptr<i8>, ...) -> i32
llvm.mlir.global internal constant @str0("WG size of kernel = %d X %d\0A\00")
llvm.func @main(%arg0: i32, %arg1: !llvm.ptr<ptr<i8>>) -> i32 {
omp.parallel {
%0 = llvm.mlir.constant(1 : index) : i64
%1 = llvm.mlir.constant(10 : index) : i64
%2 = llvm.mlir.constant(0 : index) : i64
%4 = llvm.mlir.constant(0 : i32) : i32
%12 = llvm.alloca %0 x i64 : (i64) -> !llvm.ptr<i64>
omp.wsloop (%arg2) : i64 = (%2) to (%1) step (%0) {
omp.parallel {
omp.wsloop (%arg3) : i64 = (%2) to (%0) step (%0) {
llvm.store %2, %12 : !llvm.ptr<i64>
omp.yield
}
omp.terminator
}
%19 = llvm.load %12 : !llvm.ptr<i64>
%20 = llvm.trunc %19 : i64 to i32
%5 = llvm.mlir.addressof @str0 : !llvm.ptr<array<29 x i8>>
%6 = llvm.getelementptr %5[%4, %4] : (!llvm.ptr<array<29 x i8>>, i32, i32) -> !llvm.ptr<i8>
%21 = llvm.call @printf(%6, %20, %20) : (!llvm.ptr<i8>, i32, i32) -> i32
omp.yield
}
omp.terminator
}
%a4 = llvm.mlir.constant(0 : i32) : i32
llvm.return %a4 : i32
}
}
```
Running the code results in incorrectly nondeterministic behavior.
```
wmoses@beast:~/git/Polygeist/proj/rodinia/cuda/hotspot (makefix) $ ~/git/Polygeist/mlir-build/bin/mlir-translate guan.mlir --mlir-to-llvmir | clang -x ir - -o a.exe -fopenmp && ./a.exe
WG size of kernel = 0 X 0
WG size of kernel = 4 X 4
WG size of kernel = 28515200 X 28515200
WG size of kernel = 28443392 X 28443392
WG size of kernel = 0 X 0
WG size of kernel = 1173938096 X 1173938096
WG size of kernel = 0 X 0
WG size of kernel = 1190731568 X 1190731568
WG size of kernel = 0 X 0
WG size of kernel = 0 X 0
wmoses@beast:~/git/Polygeist/proj/rodinia/cuda/hotspot (makefix) $ ~/git/Polygeist/mlir-build/bin/mlir-translate guan.mlir --mlir-to-llvmir | clang -x ir - -o a.exe -fopenmp && ./a.exe
WG size of kernel = 0 X 0
WG size of kernel = 0 X 0
WG size of kernel = 0 X 0
WG size of kernel = 0 X 0
WG size of kernel = 29627776 X 29627776
WG size of kernel = 0 X 0
WG size of kernel = 0 X 0
WG size of kernel = 0 X 0
WG size of kernel = -1301137096 X -1301137096
WG size of kernel = 0 X 0
wmoses@beast:~/git/Polygeist/proj/rodinia/cuda/hotspot (makefix) $ ~/git/Polygeist/mlir-build/bin/mlir-translate guan.mlir --mlir-to-llvmir | clang -x ir - -o a.exe -fopenmp && ./a.exe
WG size of kernel = 0 X 0
WG size of kernel = 989831216 X 989831216
WG size of kernel = 973037744 X 973037744
WG size of kernel = 19319680 X 19319680
WG size of kernel = 1006624688 X 1006624688
WG size of kernel = 0 X 0
WG size of kernel = 19271808 X 19271808
WG size of kernel = 19223936 X 19223936
WG size of kernel = 0 X 0
WG size of kernel = 19247872 X 19247872
```
cc @ftynse
</pre>
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