test/CodeGenCXX/temp-order.cpp

   1 // Output file should have no calls to error() with folding.
   2 // RUN: %clang_cc1 -triple i386-unknown-unknown -O3 -emit-llvm -o %t %s
   3 // RUN: FileCheck %s < %t
   4
   5 static unsigned pow(unsigned Base, unsigned Power) {
   6   unsigned Val = 1;
   7   while (Power--)
   8     Val *= Base;
   9   return Val;
  10 }
  11
  12 struct TempTracker {
  13   unsigned Product, Index;
  14
  15   TempTracker() : Product(1), Index(0) {}
  16
  17 };
  18
  19 // FIXME: This can be used to check elision as well, if P = 0 hacks are removed.
  20 struct A {
  21   TempTracker &TT;
  22   mutable unsigned P;
  23   bool Truth;
  24
  25   A(TempTracker &_TT, unsigned _P, bool _Truth = true)
  26     : TT(_TT), P(_P), Truth(_Truth) {}
  27   A(const A &RHS) : TT(RHS.TT), P(RHS.P), Truth(RHS.Truth) { RHS.P = 0; }
  28   ~A() {
  29     if (P)
  30       TT.Product *= pow(P, ++TT.Index);
  31   }
  32
  33   A &operator=(const A &RHS) {
  34     TT = RHS.TT;
  35     P = RHS.P;
  36     Truth = RHS.Truth;
  37     RHS.P = 0;
  38     return *this;
  39   }
  40
  41   operator bool () { return Truth; }
  42 };
  43
  44 // 3, 7, 2
  45 static unsigned f0(bool val = false) {
  46   TempTracker tt;
  47   {
  48     A a(tt, 2);
  49     if ((A(tt, 3), val))
  50       A b(tt, 5);
  51     A c(tt, 7);
  52   }
  53   return tt.Product;
  54 }
  55
  56 // 3, 5, 7, 2
  57 static unsigned f1(bool val = true) {
  58   TempTracker tt;
  59   {
  60     A a(tt, 2);
  61     if ((A(tt, 3), val))
  62       A b(tt, 5);
  63     A c(tt, 7);
  64   }
  65   return tt.Product;
  66 }
  67
  68 // 5, 3, 7, 2
  69 static unsigned f2() {
  70   TempTracker tt;
  71   {
  72     A a(tt, 2);
  73     if (A b = A(tt, 3))
  74       A c(tt, 5);
  75     A d(tt, 7);
  76   }
  77   return tt.Product;
  78 }
  79
  80 // 7, 3, 11, 2
  81 static unsigned f3() {
  82   TempTracker tt;
  83   {
  84     A a(tt, 2);
  85     if (A b = A(tt, 3, false))
  86       A c(tt, 5);
  87     else
  88       A c(tt, 7);
  89     A d(tt, 11);
  90   }
  91   return tt.Product;
  92 }
  93
  94 // 3, 7, 2
  95 static unsigned f4() {
  96   TempTracker tt;
  97   {
  98     A a(tt, 2);
  99     while (A b = A(tt, 3, false))
 100       A c(tt, 5);
 101     A c(tt, 7);
 102   }
 103   return tt.Product;
 104 }
 105
 106 // 5, 3, 7, 2
 107 static unsigned f5() {
 108   TempTracker tt;
 109   {
 110     A a(tt, 2);
 111     while (A b = A(tt, 3, true)) {
 112       A c(tt, 5);
 113       break;
 114     }
 115     A c(tt, 7);
 116   }
 117   return tt.Product;
 118 }
 119
 120 // 3, 7, 11, 5, 13, 2
 121 static unsigned f6() {
 122   TempTracker tt;
 123   {
 124     A a(tt, 2);
 125     for (A b = (A(tt, 3), A(tt, 5)), c = (A(tt, 7), A(tt, 11));;)
 126       break;
 127     A c(tt, 13);
 128   }
 129   return tt.Product;
 130 }
 131
 132 // 5, 2
 133 static unsigned f7() {
 134   TempTracker tt;
 135   {
 136     (void)((A(tt, 2, false) && A(tt, 3, false)) || A(tt, 5, false));
 137   }
 138   return tt.Product;
 139 }
 140
 141 // 5, 2
 142 static unsigned f8() {
 143   TempTracker tt;
 144
 145   {
 146     (void)((A(tt, 2) || A(tt, 3)) && A(tt, 5));
 147   }
 148   return tt.Product;
 149 }
 150
 151 extern "C" void error();
 152 extern "C" void print(const char *Name, unsigned N);
 153
 154 #define ORDER2(a, b) (pow(a, 1) * pow(b, 2))
 155 #define ORDER3(a, b, c) (ORDER2(a, b) * pow(c, 3))
 156 #define ORDER4(a, b, c, d) (ORDER3(a, b, c) * pow(d, 4))
 157 #define ORDER5(a, b, c, d, e) (ORDER4(a, b, c, d) * pow(e, 5))
 158 #define ORDER6(a, b, c, d, e, f) (ORDER5(a, b, c, d, e) * pow(f, 6))
 159 void test() {
 160 // CHECK: call void @print(i8* {{.*}}, i32 1176)
 161   print("f0", f0());
 162   if (f0() != ORDER3(3, 7, 2))
 163     error();
 164
 165 // CHECK: call void @print(i8* {{.*}}, i32 411600)
 166   print("f1", f1());
 167   if (f1() != ORDER4(3, 5, 7, 2))
 168     error();
 169
 170 // CHECK: call void @print(i8* {{.*}}, i32 246960)
 171   print("f2", f2());
 172   if (f2() != ORDER4(5, 3, 7, 2))
 173     error();
 174
 175 // CHECK: call void @print(i8* {{.*}}, i32 1341648)
 176   print("f3", f3());
 177   if (f3() != ORDER4(7, 3, 11, 2))
 178     error();
 179
 180 // CHECK: call void @print(i8* {{.*}}, i32 1176)
 181   print("f4", f4());
 182   if (f4() != ORDER3(3, 7, 2))
 183     error();
 184
 185 // CHECK: call void @print(i8* {{.*}}, i32 246960)
 186   print("f5", f5());
 187   if (f5() != ORDER4(5, 3, 7, 2))
 188     error();
 189
 190 // CHECK: call void @print(i8* {{.*}}, i32 1251552576)
 191   print("f6", f6());
 192   if (f6() != ORDER6(3, 7, 11, 5, 13, 2))
 193     error();
 194
 195 //  CHECK: call void @print(i8* {{.*}}, i32 20)
 196   print("f7", f7());
 197   if (f7() != ORDER2(5, 2))
 198     error();
 199
 200 //  CHECK: call void @print(i8* {{.*}}, i32 20)
 201   print("f8", f8());
 202   if (f8() != ORDER2(5, 2))
 203     error();
 204 }
 205
 206
 207
 208 #ifdef HARNESS
 209
 210 #include <cstdlib>
 211 #include <cstdio>
 212
 213 extern "C" void error() {
 214   abort();
 215 }
 216
 217 extern "C" void print(const char *name, unsigned N) {
 218   printf("%s: %d\n", name, N);
 219 }
 220
 221 int main() {
 222   test();
 223   return 0;
 224 }
 225
 226 #endif