VCVTNEEPH2PS

VCVTNEEPH2PS — Convert Even Elements of Packed FP16 Values to FP32 Values

Opcode/ Instruction	Op/ En	64/32 bit Mode Support	CPUID Feature Flag	Description
VEX.128.66.0F38.W0 B0 !(11):rrr:bbb VCVTNEEPH2PS xmm1, m128	AV/V		AVX_NE_ CONVERT	Convert even elements of packed FP16 values from m128 to FP32 values and store in xmm1.
VEX.256.66.0F38.W0 B0 !(11):rrr:bbb VCVTNEEPH2PS ymm1, m256	AV/V		AVX_NE_ CONVERT	Convert even elements of packed FP16 values from m256 to FP32 values and store in ymm1.

Instruction Operand Encoding

Op/En	Tuple Type	Operand 1	Operand 2	Operand 3	Operand 4
A	N/A	ModRM:reg (w)	ModRM:r/m (r)	N/A	N/A

Description

This instruction loads packed FP16 elements from memory, converts the even elements to FP32, and writes the result to the destination SIMD register.

This instruction does not generate floating-point exceptions and does not consult or update MXCSR.

Input FP16 denormals are converted to normal FP32 numbers and not treated as zero. Since any FP16 number can be represented in FP32, the conversion result is exact and no rounding is needed.

Operation

VCVTNEEPH2PS dest, src (VEX encoded version)

VL = (128, 256)
KL = VL/32
FOR i in range(0, KL):
    dest.dword[i] = convert_fp16_to_fp32(src.dword[i].word[0]) //SAE

Flags Affected

None.

Intel C/C++ Compiler Intrinsic Equivalent

VCVTNEEPH2PS __m128 _mm_cvtneeph_ps (const __m128h* __A);
VCVTNEEPH2PS __m256 _mm256_cvtneeph_ps (const __m256h* __A);

SIMD Floating-Point Exceptions

None.

Other Exceptions

See Table 2-21, “Type 4 Class Exception Conditions.”

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Source: Intel® 64 and IA-32 Architectures Software Developer's Manual, Combined Volumes (Order Number 325462-091US, March 2026)
Generated: 7-6-2026