For conditional select operands, the third and fourth operands determine the type returned. Third and fourth operands with same size, but different signedness, return the nearest common ancestor data type. For example:
I16vec4 R = select_neq(Is16vec4, Is16vec4, Is16vec4, Iu16vec4);
R0 := (A0 == B0) ? C0 : D0; R1 := (A1 == B1) ? C1 : D1; R2 := (A2 == B2) ? C2 : D2; R3 := (A3 == B3) ? C3 : D3;
R0 := (A0 != B0) ? C0 : D0; R1 := (A1 != B1) ? C1 : D1; R2 := (A2 != B2) ? C2 : D2; R3 := (A3 != B3) ? C3 : D3;
The following table lists the conditional select symbols and their corresponding intrinsics:
Conditional Select |
Operators |
Syntax |
Corresponding Intrinsic |
Additional Intrinsic (Applies to All) |
---|---|---|---|---|
Equality |
select_eq |
R = select_eq(A, B, C, D) |
_mm_cmpeq_pi32 |
_mm_and_si64
|
Inequality |
select_neq |
R = select_neq(A, B, C, D) |
_mm_cmpeq_pi32 |
|
Greater Than |
select_gt |
R = select_gt(A, B, C, D) |
_mm_cmpgt_pi32 |
|
Greater Than |
select_ge |
R = select_gt(A, B, C, D) |
_mm_cmpge_pi32 |
|
Less Than |
select_lt |
R = select_lt(A, B, C, D) |
_mm_cmplt_pi32 |
|
Less Than |
select_le |
R = select_le(A, B, C, D) |
_mm_cmple_pi32 |
All conditional select operands must be of the same size. The return data type is the nearest common ancestor of operands C and D. For conditional select operations using greater-than or less-than operations, the first and second operands must be signed as listed in the following table:
R |
Comparison |
A and B |
C |
D |
---|---|---|---|---|
I32vec2 R |
select_eq |
I[s|u]32vec2 |
I[s|u]32vec2 |
I[s|u]32vec2 |
I16vec4 R |
|
I[s|u]16vec4 |
I[s|u]16vec4 |
|
I8vec8 R |
|
I[s|u]8vec8 |
I[s|u]8vec8 |
|
I32vec2 R |
select_gt |
Is32vec2 |
Is32vec2 |
Is32vec2 |
I16vec4 R |
|
Is16vec4 |
Is16vec4 |
|
I8vec8 R |
|
Is8vec8 |
Is8vec8 |
The following table lists the mapping of return values from R0 to R7 for any number of elements. The same return value mappings also apply when there are fewer than four return values.
Return Value |
A Operands |
Available Operators | B Operands |
C and D Operands |
|||||
---|---|---|---|---|---|---|---|---|---|
R0:= |
A0 |
== |
!= |
> |
>= |
< |
<= |
B0 |
C0 : D0; |
R1:= |
A0 |
== |
!= |
> |
>= |
< |
<= |
B0 |
C1 : D1; |
R2:= |
A0 |
== |
!= |
> |
>= |
< |
<= |
B0 |
C2 : D2; |
R3:= |
A0 |
== |
!= |
> |
>= |
< |
<= |
B0 |
C3 : D3; |
R4:= |
A0 |
== |
!= |
> |
>= |
< |
<= |
B0 |
C4 : D4; |
R5:= |
A0 |
== |
!= |
> |
>= |
< |
<= |
B0 |
C5 : D5; |
R6:= |
A0 |
== |
!= |
> |
>= |
< |
<= |
B0 |
C6 : D6; |
R7:= |
A0 |
== |
!= |
> |
>= |
< |
<= |
B0 |
C7 : D7; |