CVTPD2PS — Convert Packed Double-Precision Floating-Point Values to Packed Single-Precision Floating-Point Values

Instruction Operand Encoding ¶

Description ¶

Converts two, four or eight packed double-precision floating-point values in the source operand (second operand) to two, four or eight packed single-precision floating-point values in the destination operand (first 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.

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 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-1:256/128/64) of the corresponding destination are zeroed.

VEX.256 encoded version: The source operand is a YMM register or 256- bit memory location. The destination operand is an XMM register. The upper bits (MAXVL-1:128) of the corresponding ZMM register destination are zeroed.

VEX.128 encoded version: The source operand is an XMM register or 128- bit memory location. The destination operand is a XMM register. The upper bits (MAXVL-1:64) of the corresponding ZMM register destination are zeroed.

128-bit Legacy SSE version: The source operand is an XMM register or 128- bit memory location. The destination operand is an XMM register. Bits[127:64] of the destination XMM register are zeroed. However, the upper Bits (MAXVL-1:128) of the corresponding ZMM register destination are unmodified.

VEX.vvvv and EVEX.vvvv are reserved and must be 1111b otherwise instructions will #UD.

Operation ¶

VCVTPD2PS (EVEX encoded version) when src operand is a register ¶

(KL, VL) = (2, 128), (4, 256), (8, 512)
IF (VL = 512) AND (EVEX.b = 1)
    THEN
        SET_RM(EVEX.RC);
    ELSE
        SET_RM(MXCSR.RM);
FI;
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_Single_Precision_Floating_Point(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

VCVTPD2PS (EVEX encoded version) 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_Single_Precision_Floating_Point(SRC[63:0])
                ELSE
                    DEST[i+31:i] ← Convert_Double_Precision_Floating_Point_To_Single_Precision_Floating_Point(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

VCVTPD2PS (VEX.256 encoded version) ¶

DEST[31:0] ← Convert_Double_Precision_To_Single_Precision_Floating_Point(SRC[63:0])
DEST[63:32] ← Convert_Double_Precision_To_Single_Precision_Floating_Point(SRC[127:64])
DEST[95:64] ← Convert_Double_Precision_To_Single_Precision_Floating_Point(SRC[191:128])
DEST[127:96] ← Convert_Double_Precision_To_Single_Precision_Floating_Point(SRC[255:192)
DEST[MAXVL-1:128] ← 0

VCVTPD2PS (VEX.128 encoded version) ¶

DEST[31:0] ← Convert_Double_Precision_To_Single_Precision_Floating_Point(SRC[63:0])
DEST[63:32] ← Convert_Double_Precision_To_Single_Precision_Floating_Point(SRC[127:64])
DEST[MAXVL-1:64] ← 0

CVTPD2PS (128-bit Legacy SSE version) ¶

DEST[31:0] ← Convert_Double_Precision_To_Single_Precision_Floating_Point(SRC[63:0])
DEST[63:32] ← Convert_Double_Precision_To_Single_Precision_Floating_Point(SRC[127:64])
DEST[127:64] ← 0
DEST[MAXVL-1:128] (unmodified)

Intel C/C++ Compiler Intrinsic Equivalent ¶

VCVTPD2PS __m256 _mm512_cvtpd_ps( __m512d a);

VCVTPD2PS __m256 _mm512_mask_cvtpd_ps( __m256 s, __mmask8 k, __m512d a);

VCVTPD2PS __m256 _mm512_maskz_cvtpd_ps( __mmask8 k, __m512d a);

VCVTPD2PS __m256 _mm512_cvt_roundpd_ps( __m512d a, int r);

VCVTPD2PS __m256 _mm512_mask_cvt_roundpd_ps( __m256 s, __mmask8 k, __m512d a, int r);

VCVTPD2PS __m256 _mm512_maskz_cvt_roundpd_ps( __mmask8 k, __m512d a, int r);

VCVTPD2PS __m128 _mm256_mask_cvtpd_ps( __m128 s, __mmask8 k, __m256d a);

VCVTPD2PS __m128 _mm256_maskz_cvtpd_ps( __mmask8 k, __m256d a);

VCVTPD2PS __m128 _mm_mask_cvtpd_ps( __m128 s, __mmask8 k, __m128d a);

VCVTPD2PS __m128 _mm_maskz_cvtpd_ps( __mmask8 k, __m128d a);

VCVTPD2PS __m128 _mm256_cvtpd_ps (__m256d a)

CVTPD2PS __m128 _mm_cvtpd_ps (__m128d a)

SIMD Floating-Point Exceptions ¶

Invalid, Precision, Underflow, Overflow, Denormal

Other Exceptions ¶

VEX-encoded instructions, see Exceptions Type 2;

EVEX-encoded instructions, see Exceptions Type E2.