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List:       llvm-bugs
Subject:    [llvm-bugs] [Bug 63610] [Flang] Compilation of DATA statement for large COMPLEX arrays needs a lot o
From:       LLVM Bugs via llvm-bugs <llvm-bugs () lists ! llvm ! org>
Date:       2023-06-30 0:05:35
Message-ID: 20230630000535.a592ee4442109216 () email ! llvm ! org
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<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/63610>63610</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Flang] Compilation of DATA statement for large COMPLEX arrays needs a \
lot of memory  </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          yus3710-fj
      </td>
    </tr>
</table>

<pre>
    This is an issue from Fujitsu testsuite.

Flang-new terminates abnormally when compiling the following program.
When I checked with the `top` command, `%MEM` gradually increased to 100%.
It seems that a lot of memory was used.

There is no problem with gfortran compiling on the same machine.

The following are the test program, Flang-new and gfortran compilation result, and \
the stack trace of Flang-new.

```fortran
! test.f90
complex(kind=8),dimension(1000)     :: a8
complex(kind=8),dimension(1000,1000)  :: b8
complex(kind=16),dimension(1000)    :: a16
complex(kind=16),dimension(1000,1000) :: b16

data a8/1000*(0.0,0.0)/,a16/1000*(0.0,0.0)/
data b8/1000000*(0.0,0.0)/,b16/1000000*(0.0,0.0)/

end
```
```
$ flang-new -v test.f90
flang-new version 17.0.0 (https://github.com/llvm/llvm-project.git \
                93af6bdcaf4d499e9d4c1da5aa82f92f0acc1dbd)
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /path/to/install/bin
Found candidate GCC installation: /usr/lib/gcc/aarch64-redhat-linux/8
Selected GCC installation: /usr/lib/gcc/aarch64-redhat-linux/8
Candidate multilib: .;@m64
Selected multilib: .;@m64
 &quot;/path/to/install/bin/flang-new&quot; -fc1 -triple aarch64-unknown-linux-gnu \
-emit-obj -fcolor-diagnostics -mrelocation-model pic -pic-level 2 -pic-is-pie \
-target-cpu generic -target-feature +neon -target-feature +v8a -o /tmp/test-6a351b.o \
                -x f95-cpp-input test.f90
flang-new: error: unable to execute command: Killed
flang-new: error: flang frontend command failed due to signal (use -v to see \
invocation) flang-new version 17.0.0 (https://github.com/llvm/llvm-project.git \
                93af6bdcaf4d499e9d4c1da5aa82f92f0acc1dbd)
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /path/to/install/bin
flang-new: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
flang-new: note: diagnostic msg: /tmp/test-7d3e84
flang-new: note: diagnostic msg: /tmp/test-7d3e84.sh
flang-new: note: diagnostic msg: 

********************
```
```
$ gfortran -v test.f90
Driving: gfortran -v test.f90 -l gfortran -l m -shared-libgcc
Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/aarch64-redhat-linux/8/lto-wrapper
Target: aarch64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,lto \
--prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info \
--with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared \
--enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib \
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object \
--enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu \
--enable-plugin --enable-initfini-array --with-isl --disable-libmpx \
--enable-gnu-indirect-function --build=aarch64-redhat-linux Thread model: posix
gcc version 8.3.1 20190507 (Red Hat 8.3.1-4) (GCC) 
 :
$
```
```
#0 llvm::rotr&lt;unsigned long, void&gt; (V=2994594782533612773, R=44)
    at /path/to/llvm-project/llvm/include/llvm/ADT/bit.h:378
#1 0x00007ffff0406d07 in llvm::hashing::detail::hash_state::mix_32_bytes \
(s=0x555573085270 &quot;0\272eXUU&quot;,  a=@0x7fffffffa0a8: 2994594782533612773, \
b=@0x7fffffffa0b0: 2397334626997450193)  at \
/path/to/llvm-project/llvm/include/llvm/ADT/Hashing.h:295 #2 0x00007ffff0406ec3 in \
llvm::hashing::detail::hash_state::mix (this=0x7fffffffa090, s=0x555573085270 \
&quot;0\272eXUU&quot;)  at /path/to/llvm-project/llvm/include/llvm/ADT/Hashing.h:310
#3 0x00007ffff0406c30 in llvm::hashing::detail::hash_state::create (s=0x555573085270 \
&quot;0\272eXUU&quot;,  seed=18397679294719823053) at \
/path/to/llvm-project/llvm/include/llvm/ADT/Hashing.h:283 #4 0x00007ffff04a1366 in \
llvm::hashing::detail::hash_combine_range_impl&lt;llvm::Constant* const&gt; \
(first=0x555573085270,  last=0x5555730871b0) at \
/path/to/llvm-project/llvm/include/llvm/ADT/Hashing.h:468 #5 0x00007ffff049c677 in \
llvm::hash_combine_range&lt;llvm::Constant* const*&gt; (first=0x555573085270, \
last=0x5555730871b0)  at /path/to/llvm-project/llvm/include/llvm/ADT/Hashing.h:492
#6 0x00007ffff04a7c86 in \
llvm::ConstantAggrKeyType&lt;llvm::ConstantArray&gt;::getHash (this=0x7fffffffa1b8)  \
at /path/to/llvm-project/llvm/lib/IR/ConstantsContext.h:338 #7 0x00007ffff04a274b in \
llvm::ConstantUniqueMap&lt;llvm::ConstantArray&gt;::MapInfo::getHashValue (Val={...}) \
at /path/to/llvm-project/llvm/lib/IR/ConstantsContext.h:549 #8 0x00007ffff049d449 in \
llvm::ConstantUniqueMap&lt;llvm::ConstantArray&gt;::getOrCreate (this=0x5555555d8b70, \
Ty=0x555558681880, V=...) at /path/to/llvm-project/llvm/lib/IR/ConstantsContext.h:599 \
#9 0x00007ffff048abd7 in llvm::ConstantArray::get (Ty=0x555558681880, V=...)  at \
/path/to/llvm-project/llvm/lib/IR/Constants.cpp:1238 #10 0x00007ffff0467493 in \
llvm::ConstantFoldInsertValueInstruction (Agg=0x555a2c3138e0, Val=0x55555852ccd0, \
Idxs=...)  at /path/to/llvm-project/llvm/lib/IR/ConstantFold.cpp:802
#11 0x00007ffff062802a in llvm::ConstantFolder::FoldInsertValue (this=0x7fffffffba78, \
Agg=0x555a2c3138e0,  Val=0x55555852ccd0, IdxList=...) at \
/path/to/llvm-project/llvm/include/llvm/IR/ConstantFolder.h:145 #12 \
0x00007fffe1460a71 in llvm::IRBuilderBase::CreateInsertValue (this=0x7fffffffba00, \
Agg=0x555a2c3138e0,  Val=0x55555852ccd0, Idxs=..., Name=...) at \
/path/to/llvm-project/llvm/include/llvm/IR/IRBuilder.h:2436 #13 0x00007fffe1436283 in \
convertOperationImpl (opInst=..., builder=..., moduleTranslation=...)  at \
/path/to/install/tools/mlir/include/mlir/Dialect/LLVMIR/LLVMConversions.inc:207 #14 \
0x00007fffe144f82d in (anonymous \
namespace)::LLVMDialectLLVMIRTranslationInterface::convertOperation (  \
this=0x5555555ee360, op=0x555563908280, builder=..., moduleTranslation=...)  at \
/path/to/llvm-project/mlir/lib/Target/LLVMIR/Dialect/LLVMIR/LLVMToLLVMIRTranslation.cpp:384
 #15 0x00007fffe550ed13 in mlir::LLVM::ModuleTranslation::convertOperation \
(this=0x7fffffffbcc0, op=..., builder=...)  at \
/path/to/llvm-project/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp:612 #16 \
0x00007fffe550fb60 in mlir::LLVM::ModuleTranslation::convertGlobals \
(this=0x7fffffffbcc0)  at \
/path/to/llvm-project/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp:760 #17 \
0x00007fffe551435a in mlir::translateModuleToLLVMIR (module=0x5555584d0a10, \
llvmContext=..., name=...)  at \
/path/to/llvm-project/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp:1403 #18 \
0x00007ffff6c74542 in Fortran::frontend::CodeGenAction::generateLLVMIR \
(this=0x5555555a1080)  at \
/path/to/llvm-project/flang/lib/Frontend/FrontendActions.cpp:721 #19 \
0x00007ffff6c75b4a in Fortran::frontend::CodeGenAction::executeAction \
(this=0x5555555a1080)  at \
/path/to/llvm-project/flang/lib/Frontend/FrontendActions.cpp:965 #20 \
0x00007ffff6c6d1d8 in Fortran::frontend::FrontendAction::execute \
(this=0x5555555a1080)  at \
/path/to/llvm-project/flang/lib/Frontend/FrontendAction.cpp:112 #21 \
0x00007ffff6c46f01 in Fortran::frontend::CompilerInstance::executeAction \
(this=0x55555558e630, act=...)  at \
/path/to/llvm-project/flang/lib/Frontend/CompilerInstance.cpp:167 #22 \
0x00007ffff7566a35 in Fortran::frontend::executeCompilerInvocation \
(flang=0x55555558e630)  at \
/path/to/llvm-project/flang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:174 #23 \
0x00005555555631a0 in fc1_main (argv=...,  argv0=0x7fffffffe30f \
&quot;/path/to/install/bin/flang-new&quot;)  at \
/path/to/llvm-project/flang/tools/flang-driver/fc1_main.cpp:67 #24 0x0000555555558031 \
in executeFC1Tool (argV=...)  at \
/path/to/llvm-project/flang/tools/flang-driver/driver.cpp:68 #25 0x0000555555558506 \
in main (argc=22, argv=0x7fffffffdfe8)  at \
/path/to/llvm-project/flang/tools/flang-driver/driver.cpp:111 ```

The following is a similar program but an array size is smaller.

```fortran
! small_test.f90
complex :: a(100)
data a/100*(0.0,0.0)/
end
```

That can be compiled normally, but Flang generates large MLIR with LLVM dialect.
I suspect this is the cause of the abnormal termination.

```
$ flang-new -Xflang -save-temps small_test.f90
$ cat small_test-llvmir.mlir
module attributes {dlti.dl_spec = #dlti.dl_spec&lt;#dlti.dl_entry&lt;i16, \
dense&lt;[16, 32]&gt; : vector&lt;2xi32&gt;&gt;, #dlti.dl_entry&lt;i64, \
dense&lt;64&gt; : vector&lt;2xi32&gt;&gt;, #dlti.dl_entry&lt;i128, dense&lt;128&gt; : \
vector&lt;2xi32&gt;&gt;, #dlti.dl_entry&lt;!llvm.ptr, dense&lt;64&gt; : \
vector&lt;4xi32&gt;&gt;, #dlti.dl_entry&lt;i1, dense&lt;8&gt; : \
vector&lt;2xi32&gt;&gt;, #dlti.dl_entry&lt;f16, dense&lt;16&gt; : \
vector&lt;2xi32&gt;&gt;, #dlti.dl_entry&lt;i32, dense&lt;32&gt; : \
vector&lt;2xi32&gt;&gt;, #dlti.dl_entry&lt;f64, dense&lt;64&gt; : \
vector&lt;2xi32&gt;&gt;, #dlti.dl_entry&lt;i8, dense&lt;[8, 32]&gt; : \
vector&lt;2xi32&gt;&gt;, #dlti.dl_entry&lt;f128, dense&lt;128&gt; : \
vector&lt;2xi32&gt;&gt;, #dlti.dl_entry&lt;&quot;dlti.stack_alignment&quot;, 128 : \
i32&gt;, #dlti.dl_entry&lt;&quot;dlti.endianness&quot;, &quot;little&quot;&gt;&gt;, \
fir.defaultkind = &quot;a1c4d8i4l4r4&quot;, fir.kindmap = &quot;&quot;, \
llvm.data_layout = &quot;e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128&quot;, \
llvm.target_triple = &quot;aarch64-unknown-linux-gnu&quot;} {  llvm.func @_QQmain() {
 llvm.return
  }
  llvm.mlir.global internal @_QFEa() {addr_space = 0 : i32} : !llvm.array&lt;100 x \
struct&lt;(f32, f32)&gt;&gt; {  %0 = llvm.mlir.constant(0.000000e+00 : f32) : f32
    %1 = llvm.mlir.undef : !llvm.array&lt;100 x struct&lt;(f32, f32)&gt;&gt;
    %2 = llvm.mlir.undef : !llvm.struct&lt;(f32, f32)&gt;
    %3 = llvm.insertvalue %0, %2[0] : !llvm.struct&lt;(f32, f32)&gt; 
    %4 = llvm.insertvalue %0, %3[1] : !llvm.struct&lt;(f32, f32)&gt; 
    %5 = llvm.insertvalue %4, %1[0] : !llvm.array&lt;100 x struct&lt;(f32, \
f32)&gt;&gt;   %6 = llvm.insertvalue %4, %5[1] : !llvm.array&lt;100 x struct&lt;(f32, \
f32)&gt;&gt;   %7 = llvm.insertvalue %4, %6[2] : !llvm.array&lt;100 x struct&lt;(f32, \
f32)&gt;&gt;   %8 = llvm.insertvalue %4, %7[3] : !llvm.array&lt;100 x struct&lt;(f32, \
f32)&gt;&gt;   %9 = llvm.insertvalue %4, %8[4] : !llvm.array&lt;100 x struct&lt;(f32, \
f32)&gt;&gt;   %10 = llvm.insertvalue %4, %9[5] : !llvm.array&lt;100 x \
struct&lt;(f32, f32)&gt;&gt;   %11 = llvm.insertvalue %4, %10[6] : !llvm.array&lt;100 \
x struct&lt;(f32, f32)&gt;&gt;   :
    %103 = llvm.insertvalue %4, %102[98] : !llvm.array&lt;100 x struct&lt;(f32, \
f32)&gt;&gt;   %104 = llvm.insertvalue %4, %103[99] : !llvm.array&lt;100 x \
struct&lt;(f32, f32)&gt;&gt;   llvm.return %104 : !llvm.array&lt;100 x \
struct&lt;(f32, f32)&gt;&gt;  }
  llvm.mlir.global external constant @_QQEnvironmentDefaults() {addr_space = 0 : i32} \
: !llvm.ptr&lt;struct&lt;(i32, ptr&lt;array&lt;0 x struct&lt;(ptr&lt;i8&gt;, \
ptr&lt;i8&gt;)&gt;&gt;&gt;)&gt;&gt; {  %0 = llvm.mlir.null : \
!llvm.ptr&lt;struct&lt;(i32, ptr&lt;array&lt;0 x struct&lt;(ptr&lt;i8&gt;, \
ptr&lt;i8&gt;)&gt;&gt;&gt;)&gt;&gt;  llvm.return %0 : !llvm.ptr&lt;struct&lt;(i32, \
ptr&lt;array&lt;0 x struct&lt;(ptr&lt;i8&gt;, ptr&lt;i8&gt;)&gt;&gt;&gt;)&gt;&gt;  }
  llvm.func @llvm.stacksave() -&gt; !llvm.ptr&lt;i8&gt; attributes {sym_visibility = \
&quot;private&quot;}  llvm.func @llvm.stackrestore(!llvm.ptr&lt;i8&gt;) attributes \
{sym_visibility = &quot;private&quot;} }
```

</pre>
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