clang/test/CodeGen/LoongArch/abi-lp64d-empty-structs.c

   1 // RUN: %clang_cc1 -triple loongarch64 -target-feature +f -target-feature +d -target-abi lp64d -emit-llvm %s -o - | \
   2 // RUN:   FileCheck --check-prefix=CHECK-C %s
   3 // RUN: %clang_cc1 -triple loongarch64 -target-feature +f -target-feature +d -target-abi lp64d -emit-llvm %s -o - -x c++ | \
   4 // RUN:   FileCheck --check-prefix=CHECK-CXX %s
   5
   6 // Fields containing empty structs are ignored when flattening
   7 // structs to examine whether the structs can be passed via FARs, even in C++.
   8 // But there is an exception that non-zero-length array of empty structures are
   9 // not ignored in C++. These rules are not documented in psABI <https://www.github.com/loongson/la-abi-specs>
  10 // but they match GCC behaviours.
  11
  12 #include <stdint.h>
  13
  14 struct empty { struct { struct { } e; }; };
  15 struct s1 { struct empty e; float f; };
  16
  17 // CHECK-C: define{{.*}} float @test_s1(float {{.*}})
  18 // CHECK-CXX: define{{.*}} float @_Z7test_s12s1(float {{.*}})
  19 struct s1 test_s1(struct s1 a) {
  20   return a;
  21 }
  22
  23 struct s2 { struct empty e; int32_t i; float f; };
  24
  25 // CHECK-C: define{{.*}} { i32, float } @test_s2(i32 {{.*}}, float {{.*}})
  26 // CHECK-CXX: define{{.*}} { i32, float } @_Z7test_s22s2(i32 {{.*}}, float {{.*}})
  27 struct s2 test_s2(struct s2 a) {
  28   return a;
  29 }
  30
  31 struct s3 { struct empty e; float f; float g; };
  32
  33 // CHECK-C: define{{.*}} { float, float } @test_s3(float {{.*}}, float {{.*}})
  34 // CHECK-CXX: define{{.*}} { float, float } @_Z7test_s32s3(float {{.*}}, float {{.*}})
  35 struct s3 test_s3(struct s3 a) {
  36   return a;
  37 }
  38
  39 struct s4 { struct empty e; float __complex__ c; };
  40
  41 // CHECK-C: define{{.*}} { float, float } @test_s4(float {{.*}}, float {{.*}})
  42 // CHECK-CXX: define{{.*}} { float, float } @_Z7test_s42s4(float {{.*}}, float {{.*}})
  43 struct s4 test_s4(struct s4 a) {
  44   return a;
  45 }
  46
  47 // An array of empty fields isn't ignored in C++ (this isn't explicit in the
  48 // psABI, but matches observed g++ behaviour).
  49
  50 struct s5 { struct empty e[1]; float f; };
  51
  52 // CHECK-C: define{{.*}} float @test_s5(float {{.*}})
  53 // CHECK-CXX: define{{.*}} i64 @_Z7test_s52s5(i64 {{.*}})
  54 struct s5 test_s5(struct s5 a) {
  55   return a;
  56 }
  57
  58 struct empty_arr { struct { struct { } e[1]; }; };
  59 struct s6 { struct empty_arr e; float f; };
  60
  61 // CHECK-C: define{{.*}} float @test_s6(float {{.*}})
  62 // CHECK-CXX: define{{.*}} i64 @_Z7test_s62s6(i64 {{.*}})
  63 struct s6 test_s6(struct s6 a) {
  64   return a;
  65 }
  66
  67 struct s7 { struct empty e[0]; float f; };
  68
  69 // CHECK-C: define{{.*}} float @test_s7(float {{.*}})
  70 // CHECK-CXX: define{{.*}} float @_Z7test_s72s7(float {{.*}})
  71 struct s7 test_s7(struct s7 a) {
  72   return a;
  73 }
  74
  75 struct empty_arr0 { struct { struct { } e[0]; }; };
  76 struct s8 { struct empty_arr0 e; float f; };
  77
  78 // CHECK-C: define{{.*}} float @test_s8(float {{.*}})
  79 // CHECK-CXX: define{{.*}} float @_Z7test_s82s8(float {{.*}})
  80 struct s8 test_s8(struct s8 a) {
  81   return a;
  82 }
  83
  84 /// Note: Below tests check how empty structs are passed while above tests check
  85 /// empty structs as fields of container struct are ignored when flattening
  86 /// structs to examine whether the container structs can be passed via FARs.
  87
  88 // CHECK-C: define{{.*}} void @test_s9()
  89 // CHECK-CXX: define{{.*}} i64 @_Z7test_s92s9(i64 {{.*}})
  90 struct s9 { struct empty e; };
  91 struct s9 test_s9(struct s9 a) {
  92   return a;
  93 }
  94
  95 // CHECK-C: define{{.*}} void @test_s10()
  96 // CHECK-CXX: define{{.*}} i64 @_Z8test_s103s10(i64 {{.*}})
  97 struct s10 { };
  98 struct s10 test_s10(struct s10 a) {
  99   return a;
 100 }
 101
 102 // CHECK-C: define{{.*}} void @test_s11()
 103 // CHECK-CXX: define{{.*}} i64 @_Z8test_s113s11(i64 {{.*}})
 104 struct s11 { struct { } s; };
 105 struct s11 test_s11(struct s11 a) {
 106   return a;
 107 }
 108
 109 // CHECK-C: define{{.*}} void @test_s12()
 110 // CHECK-CXX: define{{.*}} void @_Z8test_s123s12()
 111 struct s12 { int i[0]; };
 112 struct s12 test_s12(struct s12 a) {
 113   return a;
 114 }
 115
 116 // CHECK-C: define{{.*}} void @test_s13()
 117 // CHECK-CXX: define{{.*}} void @_Z8test_s133s13()
 118 struct s13 { struct { } s[0]; };
 119 struct s13 test_s13(struct s13 a) {
 120   return a;
 121 }
 122
 123 // CHECK-C: define{{.*}} void @test_s14()
 124 // CHECK-CXX: define{{.*}} i64 @_Z8test_s143s14(i64 {{.*}})
 125 struct s14 { struct { } s[1]; };
 126 struct s14 test_s14(struct s14 a) {
 127   return a;
 128 }
 129
 130 // CHECK-C: define{{.*}} void @test_s15()
 131 // CHECK-CXX: define{{.*}} i64 @_Z8test_s153s15(i64 {{.*}})
 132 struct s15 { int : 0; };
 133 struct s15 test_s15(struct s15 a) {
 134   return a;
 135 }
 136
 137 // CHECK-C: define{{.*}} i64 @test_s16(i64 {{.*}})
 138 // CHECK-CXX: define{{.*}} i64 @_Z8test_s163s16(i64 {{.*}})
 139 struct s16 { int : 1; };
 140 struct s16 test_s16(struct s16 a) {
 141   return a;
 142 }