VCVTTPH2W — Convert Packed FP16 Values to Signed Word Integers

Instruction En Bit Mode Flag Support Instruction En Bit Mode Flag Support 64/32 CPUID Feature Instruction En Bit Mode Flag CPUID Feature Instruction En Bit Mode Flag Op/ 64/32 CPUID Feature Instruction En Bit Mode Flag 64/32 CPUID Feature Instruction En Bit Mode Flag CPUID Feature Instruction En Bit Mode Flag Op/ 64/32 CPUID Feature		Support		Description
EVEX.128.66.MAP5.W0 7C /r VCVTTPH2W xmm1{k1}{z}, xmm2/m128/m16bcst	A	V/V	AVX512-FP16 AVX512VL	Convert eight packed FP16 values in xmm2/m128/m16bcst to eight signed word integers, and store the result in xmm1 using truncation subject to writemask k1.
EVEX.256.66.MAP5.W0 7C /r VCVTTPH2W ymm1{k1}{z}, ymm2/m256/m16bcst	A	V/V	AVX512-FP16 AVX512VL	Convert sixteen packed FP16 values in ymm2/m256/m16bcst to sixteen signed word integers, and store the result in ymm1 using truncation subject to writemask k1.
EVEX.512.66.MAP5.W0 7C /r VCVTTPH2W zmm1{k1}{z}, zmm2/m512/m16bcst {sae}	A	V/V	AVX512-FP16	Convert thirty-two packed FP16 values in zmm2/m512/m16bcst to thirty-two signed word integers, and store the result in zmm1 using truncation subject to writemask k1.

Instruction Operand Encoding ¶

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

Description ¶

This instruction converts packed FP16 values in the source operand to signed word integers in the destination operand.

When a conversion is inexact, a truncated (round toward zero) value is returned. If a converted result cannot be represented in the destination format, the floating-point invalid exception is raised, and if this exception is masked, the integer indefinite value is returned.

The destination elements are updated according to the writemask.

Operation ¶

VCVTTPH2W dest, src ¶

VL = 128, 256 or 512
KL := VL / 16
FOR j := 0 TO KL-1:
    IF k1[j] OR *no writemask*:
        IF *SRC is memory* and EVEX.b = 1:
            tsrc := SRC.fp16[0]
        ELSE
            tsrc := SRC.fp16[j]
        DEST.word[j] := Convert_fp16_to_integer16_truncate(tsrc)
    ELSE IF *zeroing*:
        DEST.word[j] := 0
    // else dest.word[j] remains unchanged
DEST[MAXVL-1:VL] := 0

Intel C/C++ Compiler Intrinsic Equivalent ¶

VCVTTPH2W __m512i _mm512_cvtt_roundph_epi16 (__m512h a, int sae);

VCVTTPH2W __m512i _mm512_mask_cvtt_roundph_epi16 (__m512i src, __mmask32 k, __m512h a, int sae);

VCVTTPH2W __m512i _mm512_maskz_cvtt_roundph_epi16 (__mmask32 k, __m512h a, int sae);

VCVTTPH2W __m128i _mm_cvttph_epi16 (__m128h a);

VCVTTPH2W __m128i _mm_mask_cvttph_epi16 (__m128i src, __mmask8 k, __m128h a);

VCVTTPH2W __m128i _mm_maskz_cvttph_epi16 (__mmask8 k, __m128h a);

VCVTTPH2W __m256i _mm256_cvttph_epi16 (__m256h a);

VCVTTPH2W __m256i _mm256_mask_cvttph_epi16 (__m256i src, __mmask16 k, __m256h a);

VCVTTPH2W __m256i _mm256_maskz_cvttph_epi16 (__mmask16 k, __m256h a);

VCVTTPH2W __m512i _mm512_cvttph_epi16 (__m512h a);

VCVTTPH2W __m512i _mm512_mask_cvttph_epi16 (__m512i src, __mmask32 k, __m512h a);

VCVTTPH2W __m512i _mm512_maskz_cvttph_epi16 (__mmask32 k, __m512h a);

SIMD Floating-Point Exceptions ¶

Invalid, Precision.

Other Exceptions ¶

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