Clang doesn't support Logical Operator supported in GCC Vector Extension?

Clang Frontend
#1

Hi,

Clang supports GCC Vector Extension. However GCC Vector Extension supports

Logical operator like <, >

If I try to compile the code like

typedef float float4 attribute((ext_vector_type(4)));

float4 a;

float4 b;

float4 c;

a = b > c;

the clang will

used type ‘int attribute((ext_vector_type(4)))’ where arithmetic, pointer, or vector type is required.

But if the code is

a = b * c;

Everything works. Do you know why vector logical operator is not supported by this time?

Thanks,

Yin

#2

The following works for me:
typedef float float4 __attribute__((ext_vector_type(4)));
typedef int int4 __attribute__((ext_vector_type(4)));
void f() {
   int4 a;
   float4 b;
   float4 c;
   a = b > c;
}

What version of clang are you using?

-Eli

#3

Hi,

typedef float float4 __attribute__((ext_vector_type(4)));
typedef long long4 __attribute__((ext_vector_type(4)));
typedef int int4 __attribute__((ext_vector_type(4)));

int main()
{
  float4 af, bf;
  long4 al, bl;
  int4 ret;
  
  ret = (bf != af);
  ret = (bl != al);
  
  return 0;
};

k.c:13:7: error: assigning to 'int4' from incompatible type 'long4';
  ret = (bl != al);
      ^ ~~~~~~~~~~

Clang is not supporting the GCC Vector Extension in this case.
Does anybody know if there is a plan to fix this?

Thanks,

                            Yin

#4

I'm pretty sure that's intentional; the result of a vector equality
operation with integer operands has the same type as the operands.

-Eli