[OPENMP] -fopenmp enables OpenMP support (fix for http://llvm.org/PR23492)

-fopenmp turns on OpenMP support and links libiomp5 as OpenMP library. Also there is -fopenmp={libiomp5|libgomp} option tha

[OPENMP] -fopenmp enables OpenMP support (fix for http://llvm.org/PR23492)

-fopenmp turns on OpenMP support and links libiomp5 as OpenMP library. Also there is -fopenmp={libiomp5|libgomp} option that allows to override effect of -fopenmp and link libgomp library (if -fopenmp=libgomp is specified).
Differential Revision: http://reviews.llvm.org/D9736

llvm-svn: 237769

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[OPENMP] Codegen for 'atomic capture'.

Adds codegen for 'atomic capture' constructs with the following forms of expressions/statements:

v = x binop= expr;
v = x++;
v = ++x;
v = x--;
v = --x;
v = x

[OPENMP] Codegen for 'atomic capture'.

Adds codegen for 'atomic capture' constructs with the following forms of expressions/statements:

v = x binop= expr;
v = x++;
v = ++x;
v = x--;
v = --x;
v = x = x binop expr;
v = x = expr binop x;
{v = x; x = binop= expr;}
{v = x; x++;}
{v = x; ++x;}
{v = x; x--;}
{v = x; --x;}
{x = x binop expr; v = x;}
{x binop= expr; v = x;}
{x++; v = x;}
{++x; v = x;}
{x--; v = x;}
{--x; v = x;}
{x = x binop expr; v = x;}
{x = expr binop x; v = x;}
{v = x; x = expr;}
If x and expr are integer and binop is associative or x is a LHS in a RHS of the assignment expression, and atomics are allowed for type of x on the target platform atomicrmw instruction is emitted.
Otherwise compare-and-swap sequence is emitted.
Update of 'v' is not required to be be atomic with respect to the read or write of the 'x'.

bb:
...
atomic load <x>
cont:
<expected> = phi [ <x>, label %bb ], [ <new_failed>, %cont ]
<desired> = <expected> binop <expr>
<res> = cmpxchg atomic &<x>, desired, expected
<new_failed> = <res>.field1;
br <res>field2, label %exit, label %cont
exit:
atomic store <old/new x>, <v>
...
Differential Revision: http://reviews.llvm.org/D9049

llvm-svn: 235573

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[OPENMP] Sema analysis for 'atomic capture' construct.

Added sema checks for forms of expressions/statements allowed under control of 'atomic capture' directive + generation of helper objects for fu

[OPENMP] Sema analysis for 'atomic capture' construct.

Added sema checks for forms of expressions/statements allowed under control of 'atomic capture' directive + generation of helper objects for future codegen.

llvm-svn: 233785

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[OPENMP] Additional sema analysis for 'omp atomic[ update]'.
Adds additional semantic analysis + generation of helper expressions for proper codegen.

llvm-svn: 232164

[OPENMP] Additional processing of 'omp atomic write' directive.
According to OpenMP standard, Section 2.12.6, atomic Construct, '#pragma omp atomic write' is allowed to be used only for expression st

[OPENMP] Additional processing of 'omp atomic write' directive.
According to OpenMP standard, Section 2.12.6, atomic Construct, '#pragma omp atomic write' is allowed to be used only for expression statements of form 'x = expr;', where x is a lvalue expression and expr is an expression with scalar type. Patch adds checks for it.

llvm-svn: 222913

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[OPENMP] Additional processing of 'omp atomic read' directive.
According to OpenMP standard, Section 2.12.6, atomic Construct, '#pragma omp atomic read' is allowed to be used only for expression stat

[OPENMP] Additional processing of 'omp atomic read' directive.
According to OpenMP standard, Section 2.12.6, atomic Construct, '#pragma omp atomic read' is allowed to be used only for expression statements of form 'v = x;', where x and v (as applicable) are both l-value expressions with scalar type. Patch adds checks for it.

llvm-svn: 222231

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[OPENMP] Initial parsing and sema analysis for clause 'seq_cst' of 'atomic' directive.

llvm-svn: 213846

[OPENMP] Initial parsing and sema analysis for clause 'capture' in 'atomic' directive.

llvm-svn: 213842

[OPENMP] Initial parsing and sema analysis for 'update' clause of 'atomic' directive.

llvm-svn: 213735

[OPENMP] Initial parsing an sema analysis for 'write' clause of 'atomic' directive.

llvm-svn: 213728

[OPENMP] Initial parsing and sema analysis for 'read' clause in 'atomic' directive.

llvm-svn: 213717

[OPENMP] Initial parsing and sema analysis for 'atomic' directive.

llvm-svn: 213639