VCVTTPS2UDQ - Convert With Truncation Packed Single Precision Floating-Point Values to Packed Unsigned Doubleword Integer Values

Opcode/ Instruction

Op / En

64/32 bit Mode Support

CPUID Feature Flag

Description

EVEX.128.0F.W0 78 /r VCVTTPS2UDQ xmm1 {k1}{z}, xmm2/m128/m32bcst

A

V/V

AVX512VL AVX512F

Convert four packed single precision floating-point values from xmm2/m128/m32bcst to four packed unsigned doubleword values in xmm1 using truncation subject to writemask k1.

EVEX.256.0F.W0 78 /r VCVTTPS2UDQ ymm1 {k1}{z}, ymm2/m256/m32bcst

A

V/V

AVX512VL AVX512F

Convert eight packed single precision floating-point values from ymm2/m256/m32bcst to eight packed unsigned doubleword values in ymm1 using truncation subject to writemask k1.

EVEX.512.0F.W0 78 /r VCVTTPS2UDQ zmm1 {k1}{z}, zmm2/m512/m32bcst{sae}

A

V/V

AVX512F

Convert sixteen packed single precision floating- point values from zmm2/m512/m32bcst to sixteen packed unsigned doubleword 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

Full

ModRM:reg (w)

ModRM:r/m (r)

N/A

N/A

Description

Converts with truncation packed single precision floating-point values in the source operand to sixteen unsigned doubleword 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 ZMM/YMM/XMM register, a 512/256/128-bit memory location or a 512/256/128-bit vector broadcasted from a 32-bit memory location. The destination operand is a ZMM/YMM/XMM register conditionally updated with writemask k1.

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

Operation

VCVTTPS2UDQ (EVEX Encoded Versions) When SRC Operand is a Register 

(KL, VL) = (4, 128), (8, 256), (16, 512)
FOR j := 0 TO KL-1
   i := j * 32
   IF k1[j] OR *no writemask*
       THEN DEST[i+31:i] :=
            Convert_Single_Precision_Floating_Point_To_UInteger_Truncate(SRC[i+31:i])
       ELSE 
            IF *merging-masking*                ; merging-masking
                THEN *DEST[i+31:i] remains unchanged*
                ELSE                            ; zeroing-masking
                     DEST[i+31:i] := 0
            FI
   FI;
ENDFOR
DEST[MAXVL-1:VL] := 0

VCVTTPS2UDQ (EVEX Encoded Versions) When SRC Operand is a Memory Source 

(KL, VL) = (4, 128), (8, 256), (16, 512)
FOR j := 0 TO KL-1
   i := j * 32
   IF k1[j] OR *no writemask*
       THEN 
            IF (EVEX.b = 1) 
                THEN
                     DEST[i+31:i] :=
            Convert_Single_Precision_Floating_Point_To_UInteger_Truncate(SRC[31:0])
                ELSE 
                     DEST[i+31:i] :=
            Convert_Single_Precision_Floating_Point_To_UInteger_Truncate(SRC[i+31:i])
            FI;
       ELSE 
            IF *merging-masking*                ; merging-masking
                THEN *DEST[i+31:i] remains unchanged*
                ELSE                            ; zeroing-masking
                     DEST[i+31:i] := 0
            FI
   FI;
ENDFOR
DEST[MAXVL-1:VL] := 0

Intel C/C++ Compiler Intrinsic Equivalent 

VCVTTPS2UDQ __m512i _mm512_cvttps_epu32( __m512 a);
VCVTTPS2UDQ __m512i _mm512_mask_cvttps_epu32( __m512i s, __mmask16 k, __m512 a);
VCVTTPS2UDQ __m512i _mm512_maskz_cvttps_epu32( __mmask16 k, __m512 a);
VCVTTPS2UDQ __m512i _mm512_cvtt_roundps_epu32( __m512 a, int sae);
VCVTTPS2UDQ __m512i _mm512_mask_cvtt_roundps_epu32( __m512i s, __mmask16 k, __m512 a, int sae);
VCVTTPS2UDQ __m512i _mm512_maskz_cvtt_roundps_epu32( __mmask16 k, __m512 a, int sae);
VCVTTPS2UDQ __m256i _mm256_mask_cvttps_epu32( __m256i s, __mmask8 k, __m256 a);
VCVTTPS2UDQ __m256i _mm256_maskz_cvttps_epu32( __mmask8 k, __m256 a);
VCVTTPS2UDQ __m128i _mm_mask_cvttps_epu32( __m128i s, __mmask8 k, __m128 a);
VCVTTPS2UDQ __m128i _mm_maskz_cvttps_epu32( __mmask8 k, __m128 a);

SIMD Floating-Point Exceptions

Invalid, Precision.

Other Exceptions

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

Additionally:

#UD

If EVEX.vvvv != 1111B.