Comparison Operators

The equality and inequality comparison operands can have mixed signedness, but they must be of the same size. The comparison operators for less-than and greater-than must be of the same sign and size.

Example of Syntax Usage for Comparison Operator

/* The nearest common ancestor is returned for compare

for equal/not-equal operations */

Iu8vec8 A;

Is8vec8 B;

I8vec8 C;

C = cmpneq(A,B);

/* Type cast needed for different-sized elements for

equal/not-equal comparisons */

Iu8vec8 A, C;

Is16vec4 B;

C = cmpeq(A,(Iu8vec8)B);

/* Type cast needed for sign or size differences for

less-than and greater-than comparisons */

Iu16vec4 A;

Is16vec4 B, C;

C = cmpge((Is16vec4)A,B);

C = cmpgt(B,C);

Inequality Comparison Symbols and Corresponding Intrinsics

Compare For:	Operators	Syntax	Intrinsic
Equality	cmpeq	R = cmpeq(A, B)	_mm_cmpeq_pi32 _mm_cmpeq_pi16 _mm_cmpeq_pi8
Inequality	cmpneq	R = cmpneq(A, B)	_mm_cmpeq_pi32 _mm_cmpeq_pi16 _mm_cmpeq_pi8	_mm_andnot_si64
Greater Than	cmpgt	R = cmpgt(A, B)	_mm_cmpgt_pi32 _mm_cmpgt_pi16 _mm_cmpgt_pi8
Greater Than or Equal To	cmpge	R = cmpge(A, B)	_mm_cmpgt_pi32 _mm_cmpgt_pi16 _mm_cmpgt_pi8	_mm_andnot_si64
Less Than	cmplt	R = cmplt(A, B)	_mm_cmpgt_pi32 _mm_cmpgt_pi16 _mm_cmpgt_pi8
Less Than or Equal To	cmple	R = cmple(A, B)	_mm_cmpgt_pi32 _mm_cmpgt_pi16 _mm_cmpgt_pi8	_mm_andnot_si64

Comparison operators have the restriction that the operands must be the size and sign as listed in the Compare Operator Overloading table.

Compare Operator Overloading

R	Comparison	A	B
I32vec2 R	cmpeq cmpne	I[s\|u]32vec2 B	I[s\|u]32vec2 B
I16vec4 R		I[s\|u]16vec4 B	I[s\|u]16vec4 B
I8vec8 R		I[s\|u]8vec8 B	I[s\|u]8vec8 B
I32vec2 R	cmpgt cmpge cmplt cmple	Is32vec2 B	Is32vec2 B
I16vec4 R		Is16vec4 B	Is16vec4 B
I8vec8 R		Is8vec8 B	Is8vec8 B