1 // RUN: %clang_cc1 -triple s390x-linux-gnu -emit-llvm %s -o - | FileCheck %s 2 3 // SystemZ prefers to align all global variables to two bytes. 4 5 struct test { 6 signed char a; 7 }; 8 9 char c; 10 // CHECK-DAG: @c ={{.*}} global i8 0, align 2 11 12 struct test s; 13 // CHECK-DAG: @s ={{.*}} global %struct.test zeroinitializer, align 2 14 15 extern char ec; 16 // CHECK-DAG: @ec = external global i8, align 2 17 18 extern struct test es; 19 // CHECK-DAG: @es = external global %struct.test, align 2 20 21 // Dummy function to make sure external symbols are used. func(void)22void func (void) 23 { 24 c = ec; 25 s = es; 26 } 27 28 // Test that a global variable with an incomplete type gets the minimum 29 // alignment of 2 per the ABI if no alignment was specified by user. 30 // 31 // CHECK-DAG: @VarNoAl {{.*}} align 2 32 // CHECK-DAG: @VarExplAl1 {{.*}} align 1 33 // CHECK-DAG: @VarExplAl4 {{.*}} align 4 34 struct incomplete_ty; 35 extern struct incomplete_ty VarNoAl; 36 extern struct incomplete_ty __attribute__((aligned(1))) VarExplAl1; 37 extern struct incomplete_ty __attribute__((aligned(4))) VarExplAl4; fun0(void)38struct incomplete_ty *fun0 (void) { return &VarNoAl; } fun1(void)39struct incomplete_ty *fun1 (void) { return &VarExplAl1; } fun2(void)40struct incomplete_ty *fun2 (void) { return &VarExplAl4; } 41 42 // The SystemZ ABI aligns __int128_t to only eight bytes. 43 44 struct S_int128 { __int128_t B; } Obj_I128; 45 __int128_t GlobI128; 46 // CHECK: @Obj_I128 = global %struct.S_int128 zeroinitializer, align 8 47 // CHECK: @GlobI128 = global i128 0, align 8 48 49 50 // Alignment should be respected for coerced argument loads 51 52 struct arg { long y __attribute__((packed, aligned(4))); }; 53 54 extern struct arg x; 55 void f(struct arg); 56 test(void)57void test (void) 58 { 59 f(x); 60 } 61 62 // CHECK-LABEL: @test 63 // CHECK: load i64, ptr @x, align 4 64