This patch adds a helper class (CGLoopInfo) for marking memory instructions with llvm.mem.parallel_loop_access metadata.

It also adds a simple initial version of codegen for pragma omp simd (it will change in the future to support all the clauses).

Differential revision: http://reviews.llvm.org/D3644

llvm-svn: 209411

1 files changed, 52 insertions, 0 deletions

diff --git a/clang/test/OpenMP/simd_metadata.c b/clang/test/OpenMP/simd_metadata.c
new file mode 100644
index 00000000000..427461dc340
--- /dev/null
+++ b/clang/test/OpenMP/simd_metadata.c
@@ -0,0 +1,52 @@
+// RUN: %clang_cc1 -fopenmp=libiomp5 -emit-llvm %s -o - | FileCheck %s
+
+void h1(float *c, float *a, float *b, int size)
+{
+// CHECK-LABEL: define void @h1
+  int t = 0;
+#pragma omp simd safelen(16) linear(t)
+  for (int i = 0; i < size; ++i) {
+    c[i] = a[i] * a[i] + b[i] * b[t];
+    ++t;
+// do not emit parallel_loop_access metadata due to usage of safelen clause.
+// CHECK-NOT: store float {{.+}}, float* {{.+}}, align {{.+}}, !llvm.mem.parallel_loop_access {{![0-9]+}}
+  }
+}
+
+void h2(float *c, float *a, float *b, int size)
+{
+// CHECK-LABEL: define void @h2
+  int t = 0;
+#pragma omp simd linear(t)
+  for (int i = 0; i < size; ++i) {
+    c[i] = a[i] * a[i] + b[i] * b[t];
+    ++t;
+// CHECK: store float {{.+}}, float* {{.+}}, align {{.+}}, !llvm.mem.parallel_loop_access [[LOOP_H2_HEADER:![0-9]+]]
+  }
+}
+
+void h3(float *c, float *a, float *b, int size)
+{
+// CHECK-LABEL: define void @h3
+#pragma omp simd
+  for (int i = 0; i < size; ++i) {
+    for (int j = 0; j < size; ++j) {
+      c[j*i] = a[i] * b[j];
+    }
+  }
+// do not emit parallel_loop_access for nested loop.
+// CHECK-NOT: store float {{.+}}, float* {{.+}}, align {{.+}}, !llvm.mem.parallel_loop_access {{![0-9]+}}
+}
+
+// Metadata for h1:
+// CHECK: [[LOOP_H1_HEADER:![0-9]+]] = metadata !{metadata [[LOOP_H1_HEADER]], metadata [[LOOP_WIDTH_16:![0-9]+]], metadata [[LOOP_VEC_ENABLE:![0-9]+]]}
+// CHECK: [[LOOP_WIDTH_16]] = metadata !{metadata !"llvm.vectorizer.width", i32 16}
+// CHECK: [[LOOP_VEC_ENABLE]] = metadata !{metadata !"llvm.vectorizer.enable", i1 true}
+//
+// Metadata for h2:
+// CHECK: [[LOOP_H2_HEADER]] = metadata !{metadata [[LOOP_H2_HEADER]], metadata [[LOOP_VEC_ENABLE]]}
+//
+// Metadata for h3:
+// CHECK: [[LOOP_H3_HEADER:![0-9]+]] = metadata !{metadata [[LOOP_H3_HEADER]], metadata [[LOOP_VEC_ENABLE]]}
+//
+