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

Opcode/

Op /

64/32

CPUID

Description

Instruction En bit Mode Support Feature Flag
EVEX.128.66.0F.W0 78 /r VCVTTPS2UQQ xmm1 {k1}{z}, xmm2/m64/m32bcst A 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 A 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} A 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 Tuple Type Operand 1 Operand 2 Operand 3 Operand 4
A Half 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, 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 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 := 0 TO KL-1

i := j * 64

k := j * 32

IF k1[j] OR *no writemask*

THEN DEST[i+63:i] :=

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] := 0

FI

FI;

ENDFOR

DEST[MAXVL-1:VL] := 0

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

(KL, VL) = (2, 128), (4, 256), (8, 512)

FOR j := 0 TO KL-1

i := j * 64

k := j * 32

IF k1[j] OR *no writemask*

THEN

IF (EVEX.b == 1)

THEN

DEST[i+63:i] :=

Convert_Single_Precision_To_UQuadInteger_Truncate(SRC[31:0])

ELSE

DEST[i+63:i] :=

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] := 0

FI

FI;

ENDFOR

DEST[MAXVL-1:VL] := 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 Table 2-47, “Type E3 Class Exception Conditions”; additionally:
If EVEX.vvvv != 1111B.