x86doc › VADDPH - Add Packed FP16 Values

VADDPH—Add Packed FP16 Values

Opcode/Instruction	Op/En	64/32 bit Mode Support	CPUID Feature Flag	Description
EVEX.128.NP.MAP5.W0 58 /r VADDPH xmm1{k1}{z}, xmm2, xmm3/m128/m16bcst	A	V/V	AVX512-FP16 AVX512VL	Add packed FP16 value from xmm3/m128/m16bcst to xmm2, and store result in xmm1 subject to writemask k1.
EVEX.256.NP.MAP5.W0 58 /r VADDPH ymm1{k1}{z}, ymm2, ymm3/m256/m16bcst	A	V/V	AVX512-FP16 AVX512VL	Add packed FP16 value from ymm3/m256/m16bcst to ymm2, and store result in ymm1 subject to writemask k1.
EVEX.512.NP.MAP5.W0 58 /r VADDPH zmm1{k1}{z}, zmm2, zmm3/m512/m16bcst {er}	A	V/V	AVX512-FP16	Add packed FP16 value from zmm3/m512/m16bcst to zmm2, and store result in zmm1 subject to writemask k1.

Instruction Operand Encoding

Op/En	Tuple	Operand 1	Operand 2	Operand 3	Operand 4
A	Full	ModRM:reg (w)	VEX.vvvv (r)	ModRM:r/m (r)	N/A

Description

This instruction adds packed FP16 values from source operands and stores the packed FP16 result in the destina-tion operand. The destination elements are updated according to the writemask.

Operation

VADDPH (EVEX Encoded Versions) When SRC2 Operand is a Register

VL = 128, 256 or 512

KL := VL/16

IF (VL = 512) AND (EVEX.b = 1):

SET_RM(EVEX.RC)

ELSE

SET_RM(MXCSR.RC)

FOR j := 0 TO KL-1:

IF k1[j] OR *no writemask*:

DEST.fp16[j] := SRC1.fp16[j] + SRC2.fp16[j]

ELSEIF *zeroing*:

DEST.fp16[j] := 0

// else dest.fp16[j] remains unchanged

DEST[MAXVL-1:VL] := 0

VADDPH (EVEX Encoded Versions) When SRC2 Operand is a Memory Source

VL = 128, 256 or 512

KL := VL/16

FOR j := 0 TO KL-1:

IF k1[j] OR *no writemask*:

IF EVEX.b = 1:

DEST.fp16[j] := SRC1.fp16[j] + SRC2.fp16[0]

ELSE:

DEST.fp16[j] := SRC1.fp16[j] + SRC2.fp16[j]

ELSE IF *zeroing*:

DEST.fp16[j] := 0

// else dest.fp16[j] remains unchanged

DEST[MAXVL-1:VL] := 0

Intel C/C++ Compiler Intrinsic Equivalent

VADDPH __m128h _mm_add_ph (__m128h a, __m128h b);

VADDPH __m128h _mm_mask_add_ph (__m128h src, __mmask8 k, __m128h a, __m128h b);

VADDPH __m128h _mm_maskz_add_ph (__mmask8 k, __m128h a, __m128h b);

VADDPH __m256h _mm256_add_ph (__m256h a, __m256h b);

VADDPH __m256h _mm256_mask_add_ph (__m256h src, __mmask16 k, __m256h a, __m256h b);

VADDPH __m256h _mm256_maskz_add_ph (__mmask16 k, __m256h a, __m256h b);

VADDPH __m512h _mm512_add_ph (__m512h a, __m512h b);

VADDPH __m512h _mm512_add_ph (__m512h a, __m512h b);

VADDPH __m512h _mm512_mask_add_ph (__m512h src, __mmask32 k, __m512h a, __m512h b);

VADDPH __m512h _mm512_maskz_add_ph (__mmask32 k, __m512h a, __m512h b);

VADDPH __m512h _mm512_add_round_ph (__m512h a, __m512h b, int rounding);

VADDPH __m512h _mm512_mask_add_round_ph (__m512h src, __mmask32 k, __m512h a, __m512h b, int rounding);

VADDPH __m512h _mm512_maskz_add_round_ph (__mmask32 k, __m512h a, __m512h b, int rounding);

SIMD Floating-Point Exceptions

Invalid, Underflow, Overflow, Precision, Denormal.

Other Exceptions

EVEX-encoded instructions, see Table 2-46, “Type E2 Class Exception Conditions.”