Visible to Intel only — GUID: GUID-EBAC8161-BADF-4585-8D78-FF265F3BEC5E
Visible to Intel only — GUID: GUID-EBAC8161-BADF-4585-8D78-FF265F3BEC5E
Shift Operators
The right shift argument can be any integer or Ivec value, and is implicitly converted to a M64 data type. The first or left operand of a << can be of any type except I[s|u]8vec[8|16].
Example Syntax Usage for Shift Operators
Automatic size and sign conversion.
Is16vec4 A,C;
Iu32vec2 B;
C = A;
A&B returns I16vec4, which must be cast to Iu16vec4 to ensure logical shift, not arithmetic shift.
Is16vec4 A, C;
Iu16vec4 B, R;
R = (Iu16vec4)(A & B) C;
A&B returns I16vec4, which must be cast to Is16vec4 to ensure arithmetic shift, not logical shift.
R = (Is16vec4)(A & B) C;
Shift Operators with Corresponding Intrinsics
Operation |
Symbols |
Syntax Usage |
Intrinsic |
---|---|---|---|
Shift Left |
<< |
R = A << B |
_mm_sll_si64 |
Shift Right |
>> |
R = A >> B |
_mm_srl_si64 |
Right shift operations with signed data types use arithmetic shifts. All unsigned and intermediate classes correspond to logical shifts. The following table shows how the return type is determined by the first argument type.
Shift Operator Overloading
Option |
R |
Right Shift | Left Shift | A |
B |
||
---|---|---|---|---|---|---|---|
Logical |
I64vec1 |
>> |
>>= |
<< |
<<= |
I64vec1 A; |
I64vec1 B; |
Logical |
I32vec2 |
>> |
>>= |
<< |
<<= |
I32vec2 A |
I32vec2 B; |
Arithmetic |
Is32vec2 |
>> |
>>= |
<< |
<<= |
Is32vec2 A |
I[s|u][N]vec[N] B; |
Logical |
Iu32vec2 |
>> |
>>= |
<< |
<<= |
Iu32vec2 A |
I[s|u][N]vec[N] B; |
Logical |
I16vec4 |
>> |
>>= |
<< |
<<= |
I16vec4 A |
I16vec4 B |
Arithmetic |
Is16vec4 |
>> |
>>= |
<< |
<<= |
Is16vec4 A |
I[s|u][N]vec[N] B; |
Logical |
Iu16vec4 |
>> |
>>= |
<< |
<<= |
Iu16vec4 A |
I[s|u][N]vec[N] B; |