MULPD — Multiply Packed Double Precision Floating-Point Values

Instruction Operand Encoding ¶

Description ¶

Multiply packed double precision floating-point values from the first source operand with corresponding values in the second source operand, and stores the packed double precision floating-point results in the destination operand.

EVEX encoded versions: The first source operand (the second operand) is a ZMM/YMM/XMM register. The second source operand can be 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 ZMM/YMM/XMM register conditionally updated with writemask k1.

VEX.256 encoded version: The first source operand is a YMM register. The second source operand can be a YMM register or a 256-bit memory location. The destination operand is a YMM register. Bits (MAXVL-1:256) of the corresponding destination ZMM register are zeroed.

VEX.128 encoded version: The first source operand is a XMM register. The second source operand can be a XMM register or a 128-bit memory location. The destination operand is a XMM register. The upper bits (MAXVL-1:128) of the destination YMM register destination are zeroed.

128-bit Legacy SSE version: The second source can be an XMM register or an 128-bit memory location. The destination is not distinct from the first source XMM register and the upper bits (MAXVL-1:128) of the corresponding ZMM register destination are unmodified.

Operation ¶

VMULPD (EVEX Encoded Versions) ¶

(KL, VL) = (2, 128), (4, 256), (8, 512)
IF (VL = 512) AND (EVEX.b = 1) AND SRC2 *is a register*
    THEN
        SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(EVEX.RC);
    ELSE
        SET_ROUNDING_MODE_FOR_THIS_INSTRUCTION(MXCSR.RC);
FI;
FOR j := 0 TO KL-1
    i := j * 64
    IF k1[j] OR *no writemask*
        THEN
            IF (EVEX.b = 1) AND (SRC2 *is memory*)
                THEN
                    DEST[i+63:i] := SRC1[i+63:i] * SRC2[63:0]
                ELSE
                    DEST[i+63:i] := SRC1[i+63:i] * SRC2[i+63:i]
            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

VMULPD (VEX.256 Encoded Version) ¶

DEST[63:0] := SRC1[63:0] * SRC2[63:0]
DEST[127:64] := SRC1[127:64] * SRC2[127:64]
DEST[191:128] := SRC1[191:128] * SRC2[191:128]
DEST[255:192] := SRC1[255:192] * SRC2[255:192]
DEST[MAXVL-1:256] := 0;
.

VMULPD (VEX.128 Encoded Version) ¶

DEST[63:0] := SRC1[63:0] * SRC2[63:0]
DEST[127:64] := SRC1[127:64] * SRC2[127:64]
DEST[MAXVL-1:128] := 0

MULPD (128-bit Legacy SSE Version) ¶

DEST[63:0] := DEST[63:0] * SRC[63:0]
DEST[127:64] := DEST[127:64] * SRC[127:64]
DEST[MAXVL-1:128] (Unmodified)

Intel C/C++ Compiler Intrinsic Equivalent ¶

VMULPD __m512d _mm512_mul_pd( __m512d a, __m512d b);

VMULPD __m512d _mm512_mask_mul_pd(__m512d s, __mmask8 k, __m512d a, __m512d b);

VMULPD __m512d _mm512_maskz_mul_pd( __mmask8 k, __m512d a, __m512d b);

VMULPD __m512d _mm512_mul_round_pd( __m512d a, __m512d b, int);

VMULPD __m512d _mm512_mask_mul_round_pd(__m512d s, __mmask8 k, __m512d a, __m512d b, int);

VMULPD __m512d _mm512_maskz_mul_round_pd( __mmask8 k, __m512d a, __m512d b, int);

VMULPD __m256d _mm256_mul_pd (__m256d a, __m256d b);

MULPD __m128d _mm_mul_pd (__m128d a, __m128d b);

SIMD Floating-Point Exceptions ¶

Overflow, Underflow, Invalid, Precision, Denormal.

Other Exceptions ¶

Non-EVEX-encoded instruction, see Table 2-19, “Type 2 Class Exception Conditions.”

EVEX-encoded instruction, see Table 2-46, “Type E2 Class Exception Conditions.”