[OPENMP]Add support for analysis of linear variables and step.

Summary:
Added support for basic analysis of the linear variables and linear step
expression. Linear loop iteration variables must be excluded from this
analysis, only non-loop iteration variables must be analyzed.

Reviewers: NoQ

Subscribers: guansong, cfe-commits, caomhin, kkwli0

Tags: #clang

Differential Revision: https://reviews.llvm.org/D65461

llvm-svn: 368295

1 files changed, 8 insertions, 0 deletions

diff --git a/clang/test/OpenMP/parallel_for_linear_messages.cpp b/clang/test/OpenMP/parallel_for_linear_messages.cpp
index b10557163b0..a6dc1fdde63 100644
--- a/clang/test/OpenMP/parallel_for_linear_messages.cpp
+++ b/clang/test/OpenMP/parallel_for_linear_messages.cpp
@@ -3,6 +3,14 @@
 // RUN: %clang_cc1 -verify -fopenmp-simd %s -Wuninitialized
 
 extern int omp_default_mem_alloc;
+
+void xxx(int argc) {
+  int i, lin, step; // expected-note {{initialize the variable 'lin' to silence this warning}} expected-note {{initialize the variable 'step' to silence this warning}}
+#pragma omp parallel for linear(lin : step) // expected-warning {{variable 'lin' is uninitialized when used here}} expected-warning {{variable 'step' is uninitialized when used here}}
+  for (i = 0; i < 10; ++i)
+    ;
+}
+
 namespace X {
 int x;
 };