clang/test/CodeGenCXX/pragma-loop-safety-imperfectly_nested.cpp

   1 // RUN: %clang_cc1 -triple x86_64-apple-darwin -std=c++11 -emit-llvm -o - %s | FileCheck %s
   2
   3 // Verify that the outer loop has the llvm.access.group property for the
   4 // accesses outside and inside the inner loop, even when the inner loop
   5 // is not perfectly nested.
   6 void vectorize_imperfectly_nested_test(int *List, int Length) {
   7 #pragma clang loop vectorize(assume_safety) interleave(disable) unroll(disable)
   8   for (int i = 0; i < Length; ++i) {
   9     List[i * Length] = 42;
  10 #pragma clang loop vectorize(assume_safety) interleave(disable) unroll(disable)
  11     for (int j = 1; j < Length - 1; ++j)
  12       List[i * Length + j] = (i + j) * 2;
  13     List[(i + 1) * Length - 1] = 21;
  14   }
  15 }
  16
  17
  18 // CHECK: load i32, ptr %Length.addr, align 4, !llvm.access.group ![[ACCESS_GROUP_2:[0-9]+]]
  19
  20 // CHECK: %[[MUL:.+]] = mul nsw i32 %add, 2
  21 // CHECK: store i32 %[[MUL]], ptr %{{.+}}, !llvm.access.group ![[ACCESS_GROUP_3:[0-9]+]]
  22 // CHECK: br label %{{.+}}, !llvm.loop ![[INNER_LOOPID:[0-9]+]]
  23 // CHECK: store i32 21, ptr %{{.+}}, !llvm.access.group ![[ACCESS_GROUP_2]]
  24 // CHECK: br label %{{.+}}, !llvm.loop ![[OUTER_LOOPID:[0-9]+]]
  25
  26 // CHECK: ![[ACCESS_GROUP_2]] = distinct !{}
  27 // CHECK: ![[ACCESS_GROUP_LIST_3:[0-9]+]]  = !{![[ACCESS_GROUP_2]], ![[ACCESS_GROUP_4:[0-9]+]]}
  28 // CHECK: ![[ACCESS_GROUP_4]] = distinct !{}
  29 // CHECK: ![[INNER_LOOPID]] = distinct !{![[INNER_LOOPID]], [[MP:![0-9]+]], ![[PARALLEL_ACCESSES_8:[0-9]+]]
  30 // CHECK: [[MP]] = !{!"llvm.loop.mustprogress"}
  31 // CHECK: ![[PARALLEL_ACCESSES_8]] = !{!"llvm.loop.parallel_accesses", ![[ACCESS_GROUP_4]]}
  32 // CHECK: ![[OUTER_LOOPID]] = distinct !{![[OUTER_LOOPID]], [[MP]], ![[PARALLEL_ACCESSES_10:[0-9]+]]
  33 // CHECK: ![[PARALLEL_ACCESSES_10]] = !{!"llvm.loop.parallel_accesses", ![[ACCESS_GROUP_2]]}