http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58422
Bug ID: 58422
Summary: vector shift operations work in C but not C++
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gabriel at teuton dot org
When operating on vectors, the shift operations <<=, >>=, <<, and >> are
recognized in C but not C++.
#include <stdint.h>
typedef int32_t int32x4_t __attribute__((vector_size(16)));
int32x4_t apply_shift(int32x4_t arg)
{
int32x4_t s = { 1, 1, 1, 1 };
arg <<= 1;
arg = arg << 1;
arg <<= s;
arg = arg << s;
return arg;
}
$ g++ -c -o shift.o shift.cpp
shift.cpp: In function ‘int32x4_t apply_shift(int32x4_t)’:
shift.cpp:9:13: error: invalid operands of types ‘int32x4_t {aka __vector(4)
int}’ and ‘int’ to binary ‘operator<<’
shift.cpp:9:13: error: in evaluation of ‘operator<<=(int32x4_t {aka
__vector(4) int}, int)’
shift.cpp:10:18: error: invalid operands of types ‘int32x4_t {aka __vector(4)
int}’ and ‘int’ to binary ‘operator<<’
shift.cpp:11:13: error: invalid operands of types ‘int32x4_t {aka __vector(4)
int}’ and ‘int32x4_t {aka __vector(4) int}’ to binary ‘operator<<’
shift.cpp:11:13: error: in evaluation of ‘operator<<=(int32x4_t {aka
__vector(4) int}, int32x4_t {aka __vector(4) int})’
shift.cpp:12:18: error: invalid operands of types ‘int32x4_t {aka __vector(4)
int}’ and ‘int32x4_t {aka __vector(4) int}’ to binary ‘operator<<’
Works fine in C:
$ gcc -c -x c -o shift.o shift.cpp
(no error)
$ g++ --version | head -n 1
g++ (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
$ uname -m -p
x86_64 x86_64
