clang/test/CodeGen/hexagon-brev-store-elm.c

   1 // REQUIRES: hexagon-registered-target
   2 // RUN: %clang_cc1 -emit-llvm -O2 -o - -triple hexagon-unknown-elf -target-cpu hexagonv60 %s | FileCheck %s
   3 // This unit test validates that the store to "dst" variable needs to be eliminated.
   4
   5 // CHECK: @brev_store_elimination_test1
   6 // CHECK: llvm.hexagon.L2.loadri.pbr
   7 // CHECK-NOT: store
   8
   9 int *brev_store_elimination_test1(int *ptr, int mod) {
  10   int dst = 100;
  11   return __builtin_brev_ldw(ptr, &dst, mod);
  12 }
  13
  14 // CHECK: @brev_store_elimination_test2
  15 // CHECK: llvm.hexagon.L2.loadri.pbr
  16 // CHECK-NOT: store
  17 extern int add(int a);
  18 int brev_store_elimination_test2(int *ptr, int mod) {
  19   int dst = 100;
  20   __builtin_brev_ldw(ptr, &dst, mod);
  21   return add(dst);
  22 }
  23
  24 // CHECK: @brev_store_elimination_test3
  25 // CHECK: llvm.hexagon.L2.loadri.pbr
  26 // CHECK-NOT: store
  27 int brev_store_elimination_test3(int *ptr, int mod, int inc) {
  28   int dst = 100;
  29   for (int i = 0; i < inc; ++i) {
  30     __builtin_brev_ldw(ptr, &dst, mod);
  31     dst = add(dst);
  32   }
  33   return dst;
  34 }
  35
  36 // brev_store_elimination_test4 validates the fact that we are not deleting the
  37 // stores if the value is passed by reference later.
  38 // CHECK: @brev_store_elimination_test4
  39 // CHECK: llvm.hexagon.L2.loadri.pbr
  40 // CHECK: store
  41 extern int sub(int *a);
  42 int brev_store_elimination_test4(int *ptr, int mod) {
  43   int dst = 100;
  44   __builtin_brev_ldw(ptr, &dst, mod);
  45   return sub(&dst);
  46 }