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Source code

VCVTPH2QQ

Convert Packed FP16 Values to Signed Quadword Integer Values

stableVMJITAOTinstruction

Encodings

OpcodeInstructionOp/En64-bitCompat/LegacyDescription
EVEX.128.66.MAP5.W0 7B /rVCVTPH2QQ xmm1{k1}{z}, xmm2/m32/m16bcstAValidValidConvert two packed FP16 values in AND AVX512VL) xmm2/m32/m16bcst to two signed quadword OR AVX10.1 integers, and store the result in xmm1 subject to writemask k1.
EVEX.256.66.MAP5.W0 7B /rVCVTPH2QQ ymm1{k1}{z}, xmm2/m64/m16bcstAValidValidConvert four packed FP16 values in AND AVX512VL) xmm2/m64/m16bcst to four signed quadword OR AVX10.1 integers, and store the result in ymm1 subject to writemask k1.
EVEX.512.66.MAP5.W0 7B /rVCVTPH2QQ zmm1{k1}{z}, xmm2/m128/m16bcst {er}AValidValidConvert eight packed FP16 values in OR AVX10.1 xmm2/m128/m16bcst to eight signed quadword integers, and store the result in zmm1 subject to writemask k1.

Operand encoding

Each mode is a value of the Op/En column above. It says which field of the encoded instruction carries each operand, in the order they are written, and whether the instruction reads it, writes it or both.

A

  1. Quarter
  2. modrm.reg escrituraModRM byte, reg field (bits 5-3)
  3. modrm.rm lecturaModRM byte, r/m field (bits 2-0); with the SIB byte and the displacement when the mod field asks for them

Measured cost

Loading measurements from arch-data...

Description

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

When a conversion is inexact, the value returned is rounded according to the rounding control bits in the MXCSR register or the embedded rounding control bits. 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 80000000_00000000H is returned.

The destination elements are updated according to the writemask.

Operation

VCVTPH2QQ DEST, SRC
VL = 128, 256 or 512
KL := VL / 64

IF *SRC is a register* and (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*:
          IF *SRC is memory* and EVEX.b = 1:
                tsrc := SRC.fp16[0]
          ELSE
                tsrc := SRC.fp16[j]
          DEST.qword[j] := Convert_fp16_to_integer64(tsrc)
    ELSE IF *zeroing*:
          DEST.qword[j] := 0
    // else dest.qword[j] remains unchanged

DEST[MAXVL-1:VL] := 0

Intel C/C++ compiler intrinsics

VCVTPH2QQ __m512i _mm512_cvt_roundph_epi64 (__m128h a, int rounding);
VCVTPH2QQ __m512i _mm512_mask_cvt_roundph_epi64 (__m512i src, __mmask8 k, __m128h a, int rounding);
VCVTPH2QQ __m512i _mm512_maskz_cvt_roundph_epi64 (__mmask8 k, __m128h a, int rounding);
VCVTPH2QQ __m128i _mm_cvtph_epi64 (__m128h a);
VCVTPH2QQ __m128i _mm_mask_cvtph_epi64 (__m128i src, __mmask8 k, __m128h a);
VCVTPH2QQ __m128i _mm_maskz_cvtph_epi64 (__mmask8 k, __m128h a);
VCVTPH2QQ __m256i _mm256_cvtph_epi64 (__m128h a);
VCVTPH2QQ __m256i _mm256_mask_cvtph_epi64 (__m256i src, __mmask8 k, __m128h a);
VCVTPH2QQ __m256i _mm256_maskz_cvtph_epi64 (__mmask8 k, __m128h a);
VCVTPH2QQ __m512i _mm512_cvtph_epi64 (__m128h a);
VCVTPH2QQ __m512i _mm512_mask_cvtph_epi64 (__m512i src, __mmask8 k, __m128h a);
VCVTPH2QQ __m512i _mm512_maskz_cvtph_epi64 (__mmask8 k, __m128h a);

SIMD Floating-Point Exceptions

Invalid, Precision.

Other Exceptions

EVEX-encoded instructions, see Table 2-48, "Type E2 Class Exception Conditions."

Sources