clang/test/CodeGen/malign-double.cpp

   1 // RUN: %clang_cc1 -malign-double -triple i386-unknown-linux -emit-llvm %s -o - \
   2 // RUN:   | FileCheck --check-prefix=CHECK-ON --check-prefix=CHECK %s
   3
   4 // RUN: %clang_cc1 -triple i386-unknown-linux -emit-llvm %s -o - \
   5 // RUN:   | FileCheck --check-prefix=CHECK-OFF --check-prefix=CHECK %s
   6
   7 /* Structs S1, S2, S3, S4, and union U5 are taken from Intel, "IA-64
   8    Software Conventions and Runtime Architecture Guide", version of
   9    August 1999, Section 4.2, Figures 4-1 through 4-5.
  10    A Union containing a double was also thrown in for good measure. */
  11
  12 struct S1 {
  13   char c;
  14 };
  15
  16 unsigned S1_align = __alignof(struct S1);
  17 unsigned S1_size = sizeof(struct S1);
  18 // CHECK: @S1_align ={{.*}} global i32 1, align 4
  19 // CHECK: @S1_size ={{.*}} global i32 1, align 4
  20
  21 unsigned S1_c_offset = (unsigned) &((struct S1*) 0)->c;
  22 // CHECK: @S1_c_offset ={{.*}} global i32 0, align 4
  23
  24 struct S2{
  25   char c;
  26   char d;
  27   short s;
  28   int n;
  29 };
  30
  31 unsigned S2_align = __alignof(struct S2);
  32 unsigned S2_size = sizeof(struct S2);
  33 // CHECK: @S2_align ={{.*}} global i32 4, align 4
  34 // CHECK: @S2_size ={{.*}} global i32 8, align 4
  35
  36 unsigned S2_c_offset = (unsigned) &((struct S2*) 0)->c;
  37 unsigned S2_d_offset = (unsigned) &((struct S2*) 0)->d;
  38 unsigned S2_s_offset = (unsigned) &((struct S2*) 0)->s;
  39 unsigned S2_n_offset = (unsigned) &((struct S2*) 0)->n;
  40 // CHECK: @S2_c_offset ={{.*}} global i32 0, align 4
  41 // CHECK: @S2_d_offset ={{.*}} global i32 1, align 4
  42 // CHECK: @S2_s_offset ={{.*}} global i32 2, align 4
  43 // CHECK: @S2_n_offset ={{.*}} global i32 4, align 4
  44
  45 struct S3 {
  46   char c;
  47   short s;
  48 };
  49
  50 unsigned S3_align = __alignof(struct S3);
  51 unsigned S3_size = sizeof(struct S3);
  52 // CHECK: @S3_align ={{.*}} global i32 2, align 4
  53 // CHECK: @S3_size ={{.*}} global i32 4, align 4
  54
  55 unsigned S3_c_offset = (unsigned) &((struct S3*) 0)->c;
  56 unsigned S3_s_offset = (unsigned) &((struct S3*) 0)->s;
  57 // CHECK: @S3_c_offset ={{.*}} global i32 0, align 4
  58 // CHECK: @S3_s_offset ={{.*}} global i32 2, align 4
  59
  60 struct S4 {
  61   char c;
  62   double d;
  63   short s;
  64 };
  65
  66 unsigned S4_align = __alignof(struct S4);
  67 unsigned S4_size = sizeof(struct S4);
  68 // CHECK-ON: @S4_align ={{.*}} global i32 8, align 4
  69 // CHECK-ON: @S4_size ={{.*}} global i32 24, align 4
  70 // CHECK-OFF: @S4_align ={{.*}} global i32 4, align 4
  71 // CHECK-OFF: @S4_size ={{.*}} global i32 16, align 4
  72
  73 unsigned S4_c_offset = (unsigned) &((struct S4*) 0)->c;
  74 unsigned S4_d_offset = (unsigned) &((struct S4*) 0)->d;
  75 unsigned S4_s_offset = (unsigned) &((struct S4*) 0)->s;
  76 // CHECK: @S4_c_offset ={{.*}} global i32 0, align 4
  77 // CHECK-ON: @S4_d_offset ={{.*}} global i32 8, align 4
  78 // CHECK-ON: @S4_s_offset ={{.*}} global i32 16, align 4
  79 // CHECK-OFF: @S4_d_offset ={{.*}} global i32 4, align 4
  80 // CHECK-OFF: @S4_s_offset ={{.*}} global i32 12, align 4
  81
  82 union S5 {
  83   char c;
  84   short s;
  85   int j;
  86 };
  87
  88 unsigned S5_align = __alignof(union S5);
  89 unsigned S5_size = sizeof(union S5);
  90 // CHECK: @S5_align ={{.*}} global i32 4, align 4
  91 // CHECK: @S5_size ={{.*}} global i32 4, align 4
  92
  93 unsigned S5_c_offset = (unsigned) &((union S5*) 0)->c;
  94 unsigned S5_s_offset = (unsigned) &((union S5*) 0)->s;
  95 unsigned S5_j_offset = (unsigned) &((union S5*) 0)->j;
  96 // CHECK: @S5_c_offset ={{.*}} global i32 0, align 4
  97 // CHECK: @S5_s_offset ={{.*}} global i32 0, align 4
  98 // CHECK: @S5_j_offset ={{.*}} global i32 0, align 4
  99
 100 union S6 {
 101   char c;
 102   double d;
 103 };
 104
 105 unsigned S6_align = __alignof(union S6);
 106 unsigned S6_size = sizeof(union S6);
 107 // CHECK-ON: @S6_align ={{.*}} global i32 8, align 4
 108 // CHECK-ON: @S6_size ={{.*}} global i32 8, align 4
 109 // CHECK-OFF: @S6_align ={{.*}} global i32 4, align 4
 110 // CHECK-OFF: @S6_size ={{.*}} global i32 8, align 4
 111
 112 unsigned S6_c_offset = (unsigned) &((union S6*) 0)->c;
 113 unsigned S6_d_offset = (unsigned) &((union S6*) 0)->d;
 114 // CHECK: @S6_c_offset ={{.*}} global i32 0, align 4
 115 // CHECK: @S6_d_offset ={{.*}} global i32 0, align 4