VCVTTPD2UDQ — Convert with Truncation Packed Double-Precision Floating-Point Values to Packed Unsigned Doubleword Integers

Instruction Operand Encoding ¶

Description ¶

Converts with truncation packed double-precision floating-point values in the source operand (the second operand) to packed unsigned doubleword integers in the destination operand (the first 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 2^w – 1 is returned, where w represents the number of bits in the destination format.

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 64-bit memory location. The destination operand is a YMM/XMM/XMM (low 64 bits) register conditionally updated with writemask k1. The upper bits (MAXVL-1:256) of the corresponding destination are zeroed.

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

Operation ¶

VCVTTPD2UDQ (EVEX encoded versions) when src2 operand is a register ¶

(KL, VL) = (2, 128), (4, 256),(8, 512)
FOR j←0 TO KL-1
    i←j * 32
    k←j * 64
    IF k1[j] OR *no writemask*
        THEN
            DEST[i+31:i] ←
            Convert_Double_Precision_Floating_Point_To_UInteger_Truncate(SRC[k+63:k])
        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/2] ← 0

VCVTTPD2UDQ (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 * 32
    k←j * 64
    IF k1[j] OR *no writemask*
        THEN
            IF (EVEX.b = 1)
                THEN
                    DEST[i+31:i] ←
            Convert_Double_Precision_Floating_Point_To_UInteger_Truncate(SRC[63:0])
                ELSE
                    DEST[i+31:i] ←
            Convert_Double_Precision_Floating_Point_To_UInteger_Truncate(SRC[k+63:k])
            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/2] ← 0

Intel C/C++ Compiler Intrinsic Equivalent ¶

VCVTTPD2UDQ __m256i _mm512_cvttpd_epu32( __m512d a);

VCVTTPD2UDQ __m256i _mm512_mask_cvttpd_epu32( __m256i s, __mmask8 k, __m512d a);

VCVTTPD2UDQ __m256i _mm512_maskz_cvttpd_epu32( __mmask8 k, __m512d a);

VCVTTPD2UDQ __m256i _mm512_cvtt_roundpd_epu32( __m512d a, int sae);

VCVTTPD2UDQ __m256i _mm512_mask_cvtt_roundpd_epu32( __m256i s, __mmask8 k, __m512d a, int sae);

VCVTTPD2UDQ __m256i _mm512_maskz_cvtt_roundpd_epu32( __mmask8 k, __m512d a, int sae);

VCVTTPD2UDQ __m128i _mm256_mask_cvttpd_epu32( __m128i s, __mmask8 k, __m256d a);

VCVTTPD2UDQ __m128i _mm256_maskz_cvttpd_epu32( __mmask8 k, __m256d a);

VCVTTPD2UDQ __m128i _mm_mask_cvttpd_epu32( __m128i s, __mmask8 k, __m128d a);

VCVTTPD2UDQ __m128i _mm_maskz_cvttpd_epu32( __mmask8 k, __m128d a);

SIMD Floating-Point Exceptions ¶

Invalid, Precision

Other Exceptions ¶

EVEX-encoded instructions, see Exceptions Type E2.