e6cb4b659a
Summary: The construction of constants for structs/unions was conflicting the expected memory layout for over-sized bit-fields. When building the necessary bits for those fields, clang was ignoring the size information computed for the struct/union memory layout and using the original data from the AST's FieldDecl information. This caused an issue in big-endian targets, where the field's contant was incorrectly misplaced due to endian calculations. This patch aims to separate the constant value from the necessary padding bits, using the proper size information for each one of them. With this, the layout of constants for over-sized bit-fields matches the ABI requirements. Reviewers: rsmith, eli.friedman, efriedma Reviewed By: efriedma Subscribers: efriedma, cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D77048
87 lines
1.6 KiB
C++
87 lines
1.6 KiB
C++
// RUN: %clang_cc1 %s -triple=x86_64-apple-darwin10 -emit-llvm -o - -O3 | FileCheck -check-prefix=CHECK-LP64 -check-prefix=CHECK %s
|
|
// RUN: %clang_cc1 %s -triple=i386-apple-darwin10 -emit-llvm -o - -O3 | FileCheck -check-prefix CHECK-LP32 -check-prefix=CHECK %s
|
|
// RUN: %clang_cc1 %s -triple=aarch64_be-none-eabi -emit-llvm -o - -O3 | FileCheck -check-prefix CHECK-A64BE -check-prefix=CHECK %s
|
|
// RUN: %clang_cc1 %s -triple=thumbv7_be-none-eabi -emit-llvm -o - -O3 | FileCheck -check-prefix CHECK-A32BE -check-prefix=CHECK %s
|
|
|
|
// CHECK-LP64: %union.Test1 = type { i32, [4 x i8] }
|
|
union Test1 {
|
|
int a;
|
|
int b: 39;
|
|
};
|
|
Test1 t1;
|
|
|
|
// CHECK-LP64: %union.Test2 = type { i8 }
|
|
union Test2 {
|
|
int : 6;
|
|
} t2;
|
|
|
|
// CHECK-LP64: %union.Test3 = type { i16 }
|
|
union Test3 {
|
|
int : 9;
|
|
} t3;
|
|
|
|
// CHECK: %union.Test4 = type { i8, i8 }
|
|
union Test4 {
|
|
char val : 16;
|
|
};
|
|
Test4 t4;
|
|
|
|
#define CHECK(x) if (!(x)) return __LINE__
|
|
|
|
// CHECK: define i32 @_Z11test_assignv()
|
|
int test_assign() {
|
|
struct {
|
|
int a;
|
|
|
|
unsigned long long b : 65;
|
|
|
|
int c;
|
|
} c;
|
|
|
|
c.a = 0;
|
|
c.b = (unsigned long long)-1;
|
|
c.c = 0;
|
|
|
|
CHECK(c.a == 0);
|
|
CHECK(c.b == (unsigned long long)-1);
|
|
CHECK(c.c == 0);
|
|
|
|
Test1 u1;
|
|
Test4 u2;
|
|
|
|
u1.b = 1;
|
|
u2.val = 42;
|
|
|
|
CHECK(u1.b == 1);
|
|
CHECK(u2.val == 42);
|
|
|
|
// CHECK: ret i32 0
|
|
return 0;
|
|
}
|
|
|
|
// CHECK: define i32 @_Z9test_initv()
|
|
int test_init() {
|
|
struct S {
|
|
int a;
|
|
|
|
unsigned long long b : 65;
|
|
|
|
int c;
|
|
};
|
|
S s1 = {1, 42, 0};
|
|
|
|
CHECK(s1.a == 1);
|
|
CHECK(s1.b == (unsigned long long)42);
|
|
CHECK(s1.c == 0);
|
|
|
|
Test1 u1 = {1};
|
|
Test4 u2 = {42};
|
|
|
|
CHECK(u1.a == 1);
|
|
CHECK(u1.b == 1);
|
|
CHECK(u2.val == 42);
|
|
|
|
// CHECK: ret i32 0
|
|
return 0;
|
|
}
|