158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
// RUN: %clang_cc1 -triple x86_64-unk-unk -emit-llvm -Os -o %t %s
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// RUN: FileCheck < %t %s
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struct s0 {
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unsigned int x[2] __attribute__((packed));
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};
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struct s1 {
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unsigned int x[2] __attribute__((packed));
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unsigned int y;
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unsigned int z __attribute__((packed));
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};
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struct s2 {
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unsigned int x[2] __attribute__((packed));
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unsigned int y __attribute__((packed));
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unsigned int z __attribute__((packed));
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};
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struct __attribute__((packed)) s3 {
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unsigned int x[2];
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unsigned int y;
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unsigned int z;
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};
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// CHECK: @align0 = local_unnamed_addr global i32 1
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int align0 = __alignof(struct s0);
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// CHECK: @align1 = local_unnamed_addr global i32 4
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int align1 = __alignof(struct s1);
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// CHECK: @align2 = local_unnamed_addr global i32 1
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int align2 = __alignof(struct s2);
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// CHECK: @align3 = local_unnamed_addr global i32 1
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int align3 = __alignof(struct s3);
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// CHECK: @align0_x = local_unnamed_addr global i32 1
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int align0_x = __alignof(((struct s0*) 0)->x);
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//
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// CHECK: @align1_x = local_unnamed_addr global i32 1
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int align1_x = __alignof(((struct s1*) 0)->x);
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// CHECK: @align2_x = local_unnamed_addr global i32 1
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int align2_x = __alignof(((struct s2*) 0)->x);
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// CHECK: @align3_x = local_unnamed_addr global i32 1
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int align3_x = __alignof(((struct s3*) 0)->x);
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// CHECK: @align0_x0 = local_unnamed_addr global i32 4
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int align0_x0 = __alignof(((struct s0*) 0)->x[0]);
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// CHECK: @align1_x0 = local_unnamed_addr global i32 4
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int align1_x0 = __alignof(((struct s1*) 0)->x[0]);
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// CHECK: @align2_x0 = local_unnamed_addr global i32 4
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int align2_x0 = __alignof(((struct s2*) 0)->x[0]);
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// CHECK: @align3_x0 = local_unnamed_addr global i32 4
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int align3_x0 = __alignof(((struct s3*) 0)->x[0]);
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// CHECK-LABEL: define i32 @f0_a
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// CHECK: load i32, i32* %{{.*}}, align 1
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// CHECK: }
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// CHECK-LABEL: define i32 @f0_b
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// CHECK: load i32, i32* %{{.*}}, align 4
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// CHECK: }
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int f0_a(struct s0 *a) {
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return a->x[1];
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}
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int f0_b(struct s0 *a) {
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return *(a->x + 1);
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}
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// Note that 'y' still causes struct s1 to be four-byte aligned.
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// Note that we are incompatible with GCC on this example.
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//
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// CHECK-LABEL: define i32 @f1_a
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// CHECK: load i32, i32* %{{.*}}, align 4
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// CHECK: }
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// CHECK-LABEL: define i32 @f1_b
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// CHECK: load i32, i32* %{{.*}}, align 4
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// CHECK: }
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// Note that we are incompatible with GCC on this example.
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//
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// CHECK-LABEL: define i32 @f1_c
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// CHECK: load i32, i32* %{{.*}}, align 4
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// CHECK: }
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// CHECK-LABEL: define i32 @f1_d
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// CHECK: load i32, i32* %{{.*}}, align 4
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// CHECK: }
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int f1_a(struct s1 *a) {
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return a->x[1];
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}
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int f1_b(struct s1 *a) {
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return *(a->x + 1);
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}
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int f1_c(struct s1 *a) {
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return a->y;
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}
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int f1_d(struct s1 *a) {
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return a->z;
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}
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// CHECK-LABEL: define i32 @f2_a
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// CHECK: load i32, i32* %{{.*}}, align 1
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// CHECK: }
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// CHECK-LABEL: define i32 @f2_b
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// CHECK: load i32, i32* %{{.*}}, align 4
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// CHECK: }
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// CHECK-LABEL: define i32 @f2_c
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// CHECK: load i32, i32* %{{.*}}, align 1
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// CHECK: }
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// CHECK-LABEL: define i32 @f2_d
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// CHECK: load i32, i32* %{{.*}}, align 1
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// CHECK: }
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int f2_a(struct s2 *a) {
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return a->x[1];
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}
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int f2_b(struct s2 *a) {
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return *(a->x + 1);
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}
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int f2_c(struct s2 *a) {
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return a->y;
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}
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int f2_d(struct s2 *a) {
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return a->z;
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}
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// CHECK-LABEL: define i32 @f3_a
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// CHECK: load i32, i32* %{{.*}}, align 1
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// CHECK: }
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// CHECK-LABEL: define i32 @f3_b
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// CHECK: load i32, i32* %{{.*}}, align 4
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// CHECK: }
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// CHECK-LABEL: define i32 @f3_c
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// CHECK: load i32, i32* %{{.*}}, align 1
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// CHECK: }
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// CHECK-LABEL: define i32 @f3_d
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// CHECK: load i32, i32* %{{.*}}, align 1
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// CHECK: }
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int f3_a(struct s3 *a) {
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return a->x[1];
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}
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int f3_b(struct s3 *a) {
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return *(a->x + 1);
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}
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int f3_c(struct s3 *a) {
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return a->y;
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}
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int f3_d(struct s3 *a) {
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return a->z;
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}
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// Verify we don't claim things are overaligned.
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//
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// CHECK-LABEL: define double @f4
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// CHECK: load double, double* {{.*}}, align 8
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// CHECK: }
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extern double g4[5] __attribute__((aligned(16)));
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double f4() {
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return g4[1];
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}
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