clang/test/CodeGen/parameter-passing.c

   1 // Check the various ways in which the three classes of values
   2 // (scalar, complex, aggregate) interact with parameter passing
   3 // (function entry, function return, call argument, call result).
   4 //
   5 // We also check _Bool and empty structures, as these can have annoying
   6 // corner cases.
   7
   8 // RUN: %clang_cc1 %s -triple i386-unknown-unknown -O3 -emit-llvm -o - | FileCheck %s
   9 // RUN: %clang_cc1 %s -triple x86_64-unknown-unknown -O3 -emit-llvm -o - | FileCheck %s
  10 // RUN: %clang_cc1 %s -triple powerpc-unknown-unknown -O3 -emit-llvm -o - | FileCheck %s
  11 // CHECK-NOT: @g0
  12
  13 typedef _Bool BoolTy;
  14 typedef int ScalarTy;
  15 typedef _Complex int ComplexTy;
  16 typedef struct { int a, b, c; } AggrTy;
  17 typedef struct { int a[0]; } EmptyTy;
  18
  19 static int result;
  20
  21 static BoolTy bool_id(BoolTy a) { return a; }
  22 static AggrTy aggr_id(AggrTy a) { return a; }
  23 static EmptyTy empty_id(EmptyTy a) { return a; }
  24 static ScalarTy scalar_id(ScalarTy a) { return a; }
  25 static ComplexTy complex_id(ComplexTy a) { return a; }
  26
  27 static void bool_mul(BoolTy a) { result *= a; }
  28
  29 static void aggr_mul(AggrTy a) { result *= a.a * a.b * a.c; }
  30
  31 static void empty_mul(EmptyTy a) { result *= 53; }
  32
  33 static void scalar_mul(ScalarTy a) { result *= a; }
  34
  35 static void complex_mul(ComplexTy a) { result *= __real a * __imag a; }
  36
  37 extern void g0(void);
  38
  39 void f0(void) {
  40   result = 1;
  41
  42   bool_mul(bool_id(1));
  43   aggr_mul(aggr_id((AggrTy) { 2, 3, 5}));
  44   empty_mul(empty_id((EmptyTy) {}));
  45   scalar_mul(scalar_id(7));
  46   complex_mul(complex_id(11 + 13i));
  47
  48   // This call should be eliminated.
  49   if (result != 2 * 3 * 5 * 7 * 11 * 13 * 53)
  50     g0();
  51 }
  52