[cfe-dev] [OMP] Clang fails to handle parallel for + collapse

[Alexey Bataev via cfe-dev]

Hi,
Thanks for the report. Problem fixed in r261080

Best regards,
Alexey Bataev
=============
Software Engineer
Intel Compiler Team


16.02.2016 17:49, Samuel Pitoiset via cfe-dev пишет:
> Hi there,
>
> It seems like Clang fails to create a OMPParallelForDirective object 
> for the given GCC test sample: 
> https://github.com/gcc-mirror/gcc/blob/master/libgomp/testsuite/libgomp.c/loop-9.c
>
> I just tried to dump the AST with clang cc1 -ast-dump -fopenmp 
> loop-9.c, and the output is:
>
> TranslationUnitDecl 0x3a53eb0 <<invalid sloc>> <invalid sloc>
> |-TypedefDecl 0x3a543c8 <<invalid sloc>> <invalid sloc> implicit 
> __int128_t '__int128'
> | `-BuiltinType 0x3a54100 '__int128'
> |-TypedefDecl 0x3a54428 <<invalid sloc>> <invalid sloc> implicit 
> __uint128_t 'unsigned __int128'
> | `-BuiltinType 0x3a54120 'unsigned __int128'
> |-TypedefDecl 0x3a546e8 <<invalid sloc>> <invalid sloc> implicit 
> __NSConstantString 'struct __NSConstantString_tag'
> | `-RecordType 0x3a54500 'struct __NSConstantString_tag'
> |   `-Record 0x3a54478 '__NSConstantString_tag'
> |-TypedefDecl 0x3a54778 <<invalid sloc>> <invalid sloc> implicit 
> __builtin_ms_va_list 'char *'
> | `-PointerType 0x3a54740 'char *'
> |   `-BuiltinType 0x3a53f40 'char'
> |-TypedefDecl 0x3a54a28 <<invalid sloc>> <invalid sloc> implicit 
> __builtin_va_list 'struct __va_list_tag [1]'
> | `-ConstantArrayType 0x3a549d0 'struct __va_list_tag [1]' 1
> |   `-RecordType 0x3a54850 'struct __va_list_tag'
> |     `-Record 0x3a547c8 '__va_list_tag'
> |-FunctionDecl 0x3aa0780 <tests/gcc-testsuite/libgomp.c/loop-9.c:1:13> 
> col:13 implicit abort 'void (void) __attribute__((noreturn))' extern
> |-FunctionDecl 0x3aa0828 prev 0x3aa0780 <col:1, col:24> col:13 used 
> abort 'void (void) __attribute__((noreturn))' extern
> |-VarDecl 0x3aa0948 <line:3:1, col:15> col:6 used buf 'char [8]' cinit
> | `-StringLiteral 0x3aa0a28 <col:15> 'char [8]' lvalue "01234567"
> |-VarDecl 0x3aa0a98 <line:4:1, col:16> col:6 used buf2 'char [8]' cinit
> | `-StringLiteral 0x3aa0af8 <col:16> 'char [8]' lvalue "23456789"
> `-FunctionDecl 0x3aa0bf0 <line:6:1, line:18:1> line:7:1 main 'int (void)'
>   `-CompoundStmt 0x3aa4fe0 <line:8:1, line:18:1>
>     |-DeclStmt 0x3aa0dc0 <line:9:3, col:14>
>     | |-VarDecl 0x3aa0cd8 <col:3, col:9> col:9 used p 'char *'
>     | `-VarDecl 0x3aa0d48 <col:3, col:13> col:13 used q 'char *'
>     |-DeclStmt 0x3aa0e68 <line:10:3, col:14>
>     | `-VarDecl 0x3aa0de8 <col:3, col:13> col:7 used sum 'int' cinit
>     |   `-IntegerLiteral 0x3aa0e48 <col:13> 'int' 0
>     |-IfStmt 0x3aa4f78 <line:15:3, line:16:12>
>     | |-<<<NULL>>>
>     | |-BinaryOperator 0x3aa4e98 <line:15:7, col:47> 'int' '||'
>     | | |-BinaryOperator 0x3aa4de8 <col:7, col:35> 'int' '||'
>     | | | |-BinaryOperator 0x3aa4cd0 <col:7, col:18> 'int' '!='
>     | | | | |-ImplicitCastExpr 0x3aa4cb8 <col:7> 'char *' 
> <LValueToRValue>
>     | | | | | `-DeclRefExpr 0x3aa4be8 <col:7> 'char *' lvalue Var 
> 0x3aa0cd8 'p' 'char *'
>     | | | | `-UnaryOperator 0x3aa4c98 <col:12, col:18> 'char *' prefix 
> '&'
>     | | | |   `-ArraySubscriptExpr 0x3aa4c70 <col:13, col:18> 'char' 
> lvalue
>     | | | |     |-ImplicitCastExpr 0x3aa4c58 <col:13> 'char *' 
> <ArrayToPointerDecay>
>     | | | |     | `-DeclRefExpr 0x3aa4c10 <col:13> 'char [8]' lvalue 
> Var 0x3aa0948 'buf' 'char [8]'
>     | | | |     `-IntegerLiteral 0x3aa4c38 <col:17> 'int' 8
>     | | | `-BinaryOperator 0x3aa4dc0 <col:23, col:35> 'int' '!='
>     | | |   |-ImplicitCastExpr 0x3aa4da8 <col:23> 'char *' 
> <LValueToRValue>
>     | | |   | `-DeclRefExpr 0x3aa4cf8 <col:23> 'char *' lvalue Var 
> 0x3aa0d48 'q' 'char *'
>     | | |   `-BinaryOperator 0x3aa4d80 <col:28, col:35> 'char *' '+'
>     | | |     |-ImplicitCastExpr 0x3aa4d68 <col:28> 'char *' 
> <ArrayToPointerDecay>
>     | | |     | `-DeclRefExpr 0x3aa4d20 <col:28> 'char [8]' lvalue Var 
> 0x3aa0a98 'buf2' 'char [8]'
>     | | |     `-IntegerLiteral 0x3aa4d48 <col:35> 'int' 8
>     | | `-BinaryOperator 0x3aa4e70 <col:40, col:47> 'int' '!='
>     | |   |-ImplicitCastExpr 0x3aa4e58 <col:40> 'int' <LValueToRValue>
>     | |   | `-DeclRefExpr 0x3aa4e10 <col:40> 'int' lvalue Var 
> 0x3aa0de8 'sum' 'int'
>     | |   `-IntegerLiteral 0x3aa4e38 <col:47> 'int' 576
>     | |-CallExpr 0x3aa4f50 <line:16:5, col:12> 'void'
>     | | `-ImplicitCastExpr 0x3aa4f38 <col:5> 'void (*)(void) 
> __attribute__((noreturn))' <FunctionToPointerDecay>
>     | |   `-DeclRefExpr 0x3aa4ee0 <col:5> 'void (void) 
> __attribute__((noreturn))' Function 0x3aa0828 'abort' 'void (void) 
> __attribute__((noreturn))'
>     | `-<<<NULL>>>
>     `-ReturnStmt 0x3aa4fc8 <line:17:3, col:10>
>       `-IntegerLiteral 0x3aa4fa8 <col:10> 'int' 0
>
>
> As you can see, there is no OMPParallelForDirective.
>
> Is it a bug in Clang? Or maybe the OMPParallelForDirective is not 
> created because the loop doesn't respect the canonical form described 
> by the OpenMP spec? In this case, it should be much better to return 
> an error message like "for is not canonical" or something.
>
> This test can be compiled with GCC 5.3.
>
> Thanks!
>