VMULPH - Multiply Packed FP16 Values

Opcode/ Instruction

Op/ En

64/32 bit Mode Support

CPUID Feature Flag

Description

EVEX.128.NP.MAP5.W0 59 /r

VMULPH xmm1{k1}{z}, xmm2, xmm3/ m128/m16bcst

A

V/V

AVX512-FP16 AVX512VL

Multiply packed FP16 values from xmm3/m128/ m16bcst to xmm2 and store the result in xmm1 subject to writemask k1.

EVEX.256.NP.MAP5.W0 59 /r

VMULPH ymm1{k1}{z}, ymm2, ymm3/ m256/m16bcst

A

V/V

AVX512-FP16 AVX512VL

Multiply packed FP16 values from ymm3/m256/ m16bcst to ymm2 and store the result in ymm1 subject to writemask k1.

EVEX.512.NP.MAP5.W0 59 /r VMULPH zmm1{k1}{z}, zmm2, zmm3/ m512/m16bcst {er}

A

V/V

AVX512-FP16

Multiply packed FP16 values in zmm3/m512/ m16bcst with zmm2 and store the 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 multiplies packed FP16 values from source operands and stores the packed FP16 result in the desti- nation operand. The destination elements are updated according to the writemask.

Operation

VMULPH (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]
   ELSE IF *zeroing*:
       DEST.fp16[j] := 0
   // else dest.fp16[j] remains unchanged
DEST[MAXVL-1:VL] := 0

VMULPH (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 

VMULPH __m128h _mm_mask_mul_ph (__m128h src, __mmask8 k, __m128h a, __m128h b);
VMULPH __m128h _mm_maskz_mul_ph (__mmask8 k, __m128h a, __m128h b);
VMULPH __m128h _mm_mul_ph (__m128h a, __m128h b);
VMULPH __m256h _mm256_mask_mul_ph (__m256h src, __mmask16 k, __m256h a, __m256h b);
VMULPH __m256h _mm256_maskz_mul_ph (__mmask16 k, __m256h a, __m256h b);
VMULPH __m256h _mm256_mul_ph (__m256h a, __m256h b);
VMULPH __m512h _mm512_mask_mul_ph (__m512h src, __mmask32 k, __m512h a, __m512h b);
VMULPH __m512h _mm512_maskz_mul_ph (__mmask32 k, __m512h a, __m512h b);
VMULPH __m512h _mm512_mul_ph (__m512h a, __m512h b);
VMULPH __m512h _mm512_mask_mul_round_ph (__m512h src, __mmask32 k, __m512h a, __m512h b, int rounding);
VMULPH __m512h _mm512_maskz_mul_round_ph (__mmask32 k, __m512h a, __m512h b, int rounding);
VMULPH __m512h _mm512_mul_round_ph (__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."