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VCVTTPS2UQQ—Convert with Truncation Packed Single Precision Floating-Point Values to Packed Unsigned Quadword Integer Values

Opcode/Instruction Op /En 64/32 bit Mode Support CPUID Feature Flag Description

EVEX.128.66.0F.W0 78 /r

VCVTTPS2UQQ xmm1 {k1}{z}, xmm2/m64/m32bcst

 HV V/V

AVX512VL

AVX512DQ

 Convert two packed single precision floating-point values from xmm2/m64/m32bcst to two packed unsigned quadword values in xmm1 using truncation subject to writemask k1.

EVEX.256.66.0F.W0 78 /r

VCVTTPS2UQQ ymm1 {k1}{z}, xmm2/m128/m32bcst

 HV V/V

AVX512VL

AVX512DQ

 Convert four packed single precision floating-point values from xmm2/m128/m32bcst to four packed unsigned quadword values in ymm1 using truncation subject to writemask k1.

EVEX.512.66.0F.W0 78 /r

VCVTTPS2UQQ zmm1 {k1}{z}, ymm2/m256/m32bcst{sae}

 HV V/V AVX512DQ Convert eight packed single precision floating-point values from ymm2/m256/m32bcst to eight packed unsigned quadword values in zmm1 using truncation subject to writemask k1.

Instruction Operand Encoding

Op/En Operand 1 Operand 2 Operand 3 Operand 4
HV ModRM:reg (w) ModRM:r/m (r) NA NA

Description

Converts with truncation up to eight packed single-precision floating-point values in the source operand to unsigned quadword integers in the destination operand.

When a conversion is inexact, the value returned is rounded according to the rounding control bits in the MXCSR register. 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 value 2w – 1 is returned, where w represents the number of bits in the destination format.

EVEX encoded versions: The source operand is a YMM/XMM/XMM (low 64 bits) register or a 256/128/64-bit memory location. The destination operation is a vector register conditionally updated with writemask k1.

Note: EVEX.vvvv is reserved and must be 1111b otherwise instructions will #UD.

Operation


VCVTTPS2UQQ (EVEX encoded versions) when src operand is a register

(KL, VL) = (2, 128), (4, 256), (8, 512)
FOR j (cid:197) 0 TO KL-1
    i (cid:197) j * 64
    k (cid:197) j * 32
    IF k1[j] OR *no writemask*
        THEN DEST[i+63:i] (cid:197)
        Convert_Single_Precision_To_UQuadInteger_Truncate(SRC[k+31:k])
        ELSE
        IF *merging-masking*
            ; merging-masking
            THEN *DEST[i+63:i] remains unchanged*
            ELSE
            ; zeroing-masking
            DEST[i+63:i] (cid:197) 0
        FI
    FI;
ENDFOR
DEST[MAX_VL-1:VL] (cid:197) 0


VCVTTPS2UQQ (EVEX encoded versions) when src operand is a memory source

(KL, VL) = (2, 128), (4, 256), (8, 512)
FOR j (cid:197) 0 TO KL-1
    i (cid:197) j * 64
    k (cid:197) j * 32
    IF k1[j] OR *no writemask*
        THEN
        IF (EVEX.b == 1)
            THEN
            DEST[i+63:i] (cid:197)
            Convert_Single_Precision_To_UQuadInteger_Truncate(SRC[31:0])
            ELSE
            DEST[i+63:i] (cid:197)
            Convert_Single_Precision_To_UQuadInteger_Truncate(SRC[k+31:k])
        FI;
        ELSE
        IF *merging-masking*
            ; merging-masking
            THEN *DEST[i+63:i] remains unchanged*
            ELSE
            ; zeroing-masking
            DEST[i+63:i] (cid:197) 0
        FI
    FI;
ENDFOR
DEST[MAX_VL-1:VL] (cid:197) 0



Intel C/C++ Compiler Intrinsic Equivalent


VCVTTPS2UQQ _mm<size>[_mask[z]]_cvtt[_round]ps_epu64
VCVTTPS2UQQ __m512i _mm512_cvttps_epu64( __m256 a);
VCVTTPS2UQQ __m512i _mm512_mask_cvttps_epu64( __m512i s, __mmask16 k, __m256 a);
VCVTTPS2UQQ __m512i _mm512_maskz_cvttps_epu64( __mmask16 k, __m256 a);
VCVTTPS2UQQ __m512i _mm512_cvtt_roundps_epu64( __m256 a, int sae);
VCVTTPS2UQQ __m512i _mm512_mask_cvtt_roundps_epu64( __m512i s, __mmask16 k, __m256 a, int sae);
VCVTTPS2UQQ __m512i _mm512_maskz_cvtt_roundps_epu64( __mmask16 k, __m256 a, int sae);
VCVTTPS2UQQ __m256i _mm256_mask_cvttps_epu64( __m256i s, __mmask8 k, __m128 a);
VCVTTPS2UQQ __m256i _mm256_maskz_cvttps_epu64( __mmask8 k, __m128 a);
VCVTTPS2UQQ __m128i _mm_mask_cvttps_epu64( __m128i s, __mmask8 k, __m128 a);
VCVTTPS2UQQ __m128i _mm_maskz_cvttps_epu64( __mmask8 k, __m128 a);



SIMD Floating-Point Exceptions


Invalid, Precision


Other Exceptions





EVEX-encoded instructions, see Exceptions Type E3.



If EVEX.vvvv != 1111B.