x86doc › VCVTTPH2QQ - Convert with Truncation Packed FP16 Values to Signed Quadword Integers

VCVTTPH2QQ—Convert with Truncation Packed FP16 Values to Signed Quadword Integers

Opcode/Instruction	Op/En	64/32 bit Mode Support	CPUID Feature Flag	Description
EVEX.128.66.MAP5.W0 7A /r VCVTTPH2QQ xmm1{k1}{z}, xmm2/m32/m16bcst	A	V/V	AVX512-FP16 AVX512VL	Convert two packed FP16 values in xmm2/m32/m16bcst to two signed quadword integers, and store the result in xmm1 using truncation subject to writemask k1.
EVEX.256.66.MAP5.W0 7A /r VCVTTPH2QQ ymm1{k1}{z}, xmm2/m64/m16bcst	A	V/V	AVX512-FP16 AVX512VL	Convert four packed FP16 values in xmm2/m64/m16bcst to four signed quadword integers, and store the result in ymm1 using truncation subject to writemask k1.
EVEX.512.66.MAP5.W0 7A /r VCVTTPH2QQ zmm1{k1}{z}, xmm2/m128/m16bcst {sae}	A	V/V	AVX512-FP16	Convert eight packed FP16 values in xmm2/m128/m16bcst to eight signed quadword 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	Quarter	ModRM:reg (w)	ModRM:r/m (r)	N/A	N/A

Description

This instruction converts packed FP16 values in the source operand to signed quadword 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 indefinite integer value is returned.

The destination elements are updated according to the writemask.

Operation

VCVTTPH2QQ dest, src

VL = 128, 256 or 512

KL := VL / 64

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.qword[j] := Convert_fp16_to_integer64_truncate(tsrc)

ELSE IF *zeroing*:

DEST.qword[j] := 0

// else dest.qword[j] remains unchanged

DEST[MAXVL-1:VL] := 0

Intel C/C++ Compiler Intrinsic Equivalent

VCVTTPH2QQ __m512i _mm512_cvtt_roundph_epi64 (__m128h a, int sae);

VCVTTPH2QQ __m512i _mm512_mask_cvtt_roundph_epi64 (__m512i src, __mmask8 k, __m128h a, int sae);

VCVTTPH2QQ __m512i _mm512_maskz_cvtt_roundph_epi64 (__mmask8 k, __m128h a, int sae);

VCVTTPH2QQ __m128i _mm_cvttph_epi64 (__m128h a);

VCVTTPH2QQ __m128i _mm_mask_cvttph_epi64 (__m128i src, __mmask8 k, __m128h a);

VCVTTPH2QQ __m128i _mm_maskz_cvttph_epi64 (__mmask8 k, __m128h a);

VCVTTPH2QQ __m256i _mm256_cvttph_epi64 (__m128h a);

VCVTTPH2QQ __m256i _mm256_mask_cvttph_epi64 (__m256i src, __mmask8 k, __m128h a);

VCVTTPH2QQ __m256i _mm256_maskz_cvttph_epi64 (__mmask8 k, __m128h a);

VCVTTPH2QQ __m512i _mm512_cvttph_epi64 (__m128h a);

VCVTTPH2QQ __m512i _mm512_mask_cvttph_epi64 (__m512i src, __mmask8 k, __m128h a);

VCVTTPH2QQ __m512i _mm512_maskz_cvttph_epi64 (__mmask8 k, __m128h a);

SIMD Floating-Point Exceptions

Invalid, Precision.

Other Exceptions

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