clang/test/CodeGen/loop-unroll.c

   1 // RUN: %clang_cc1 -triple x86_64 -target-cpu x86-64 -O1 -funroll-loops -emit-llvm -o - %s | FileCheck %s -check-prefix=CHECK-ENABLE-UNROLL
   2 // RUN: %clang_cc1 -triple x86_64 -target-cpu x86-64 -O1 -fno-unroll-loops -emit-llvm -o - %s | FileCheck %s -check-prefix=CHECK-DISABLE-UNROLL
   3 // REQUIRES: x86-registered-target
   4
   5 // CHECK-ENABLE-UNROLL-LABEL: @for_test()
   6 // CHECK-ENABLE-UNROLL: br label %[[FORBODY:[a-z0-9_\.]+]]
   7 // CHECK-ENABLE-UNROLL: [[FORBODY]]:
   8 // CHECK-ENABLE-UNROLL: store
   9 // CHECK-ENABLE-UNROLL: store
  10 // CHECK-ENABLE-UNROLL: br i1 %[[EXITCOND:[a-z0-9_\.]+]], label %[[FORBODY5:[a-z0-9_\.]+]], label %[[FORBODY]]
  11 // CHECK-ENABLE-UNROLL: [[FORBODY5]]:
  12 // CHECK-ENABLE-UNROLL: fmul
  13 // CHECK-ENABLE-UNROLL: fadd
  14 // CHECK-ENABLE-UNROLL: store
  15 // CHECK-ENABLE-UNROLL: fmul
  16 // CHECK-ENABLE-UNROLL: fadd
  17 // CHECK-ENABLE-UNROLL: store
  18 // CHECK-ENABLE-UNROLL: fmul
  19 // CHECK-ENABLE-UNROLL: fadd
  20 // CHECK-ENABLE-UNROLL: store
  21
  22 // CHECK-DISABLE-UNROLL-LABEL: @for_test()
  23 // CHECK-DISABLE-UNROLL: br label %[[FORBODY:[a-z0-9_\.]+]]
  24 // CHECK-DISABLE-UNROLL: [[FORBODY]]:
  25 // CHECK-DISABLE-UNROLL: store
  26 // CHECK-DISABLE-UNROLL-NOT: store
  27 // CHECK-DISABLE-UNROLL: br i1 %[[EXITCOND:[a-z0-9_\.]+]], label %[[FORBODY5:[a-z0-9_\.]+]], label %[[FORBODY]]
  28 // CHECK-DISABLE-UNROLL: [[FORBODY5]]:
  29 // CHECK-DISABLE-UNROLL: fmul
  30 // CHECK-DISABLE-UNROLL: fadd
  31 // CHECK-DISABLE-UNROLL: store
  32 // CHECK-DISABLE-UNROLL: fmul
  33 // CHECK-DISABLE-UNROLL: fadd
  34 // CHECK-DISABLE-UNROLL: store
  35 // CHECK-DISABLE-UNROLL-NOT: fmul
  36 // CHECK-DISABLE-UNROLL-NOT: fadd
  37 // CHECK-DISABLE-UNROLL-NOT: store
  38 // Limit scope of checking so this does not match "fadd" within git version string
  39 // CHECK-DISABLE-UNROLL: !0 =
  40
  41 int printf(const char * restrict format, ...);
  42
  43 void for_test(void) {
  44   double A[1000], B[1000];
  45   int L = 500;
  46   for (int i = 0; i < L; i++) {
  47     A[i] = i;
  48   }
  49   for (int i = 0; i < L; i++) {
  50     B[i] = A[i]*5;
  51     B[i]++;
  52     A[i] *= 7;
  53     A[i]++;
  54   }
  55   printf("%lf %lf\n", A[0], B[0]);
  56 }