MOVSHDUP — Replicate Single FP Values

Opcode/Instruction Op/En 64/32 bit Mode Support CPUID Feature Flag Description
F3 0F 16 /r MOVSHDUP xmm1, xmm2/m128 A V/V SSE3 Move odd index single-precision floating-point values from xmm2/mem and duplicate each element into xmm1.
VEX.128.F3.0F.WIG 16 /r VMOVSHDUP xmm1, xmm2/m128 A V/V AVX Move odd index single-precision floating-point values from xmm2/mem and duplicate each element into xmm1.
VEX.256.F3.0F.WIG 16 /r VMOVSHDUP ymm1, ymm2/m256 A V/V AVX Move odd index single-precision floating-point values from ymm2/mem and duplicate each element into ymm1.
EVEX.128.F3.0F.W0 16 /r VMOVSHDUP xmm1 {k1}{z}, xmm2/m128 B V/V AVX512VL AVX512F Move odd index single-precision floating-point values from xmm2/m128 and duplicate each element into xmm1 under writemask.
EVEX.256.F3.0F.W0 16 /r VMOVSHDUP ymm1 {k1}{z}, ymm2/m256 B V/V AVX512VL AVX512F Move odd index single-precision floating-point values from ymm2/m256 and duplicate each element into ymm1 under writemask.
EVEX.512.F3.0F.W0 16 /r VMOVSHDUP zmm1 {k1}{z}, zmm2/m512 B V/V AVX512F Move odd index single-precision floating-point values from zmm2/m512 and duplicate each element into zmm1 under writemask.

Instruction Operand Encoding

Op/En Tuple Type Operand 1 Operand 2 Operand 3 Operand 4
A NA ModRM:reg (w) ModRM:r/m (r) NA NA
B Full Mem ModRM:reg (w) ModRM:r/m (r) NA NA

Description

Duplicates odd-indexed single-precision floating-point values from the source operand (the second operand) to adjacent element pair in the destination operand (the first operand). See Figure 4-3. The source operand is an XMM, YMM or ZMM register or 128, 256 or 512-bit memory location and the destination operand is an XMM, YMM or ZMM register.

128-bit Legacy SSE version: Bits (MAXVL-1:128) of the corresponding destination register remain unchanged.

VEX.128 encoded version: Bits (MAXVL-1:128) of the destination register are zeroed.

VEX.256 encoded version: Bits (MAXVL-1:256) of the destination register are zeroed.

EVEX encoded version: The destination operand is updated at 32-bit granularity according to the writemask.

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

X7 X6 X5 X4 X3 X2 X1 X0 SRC DEST X7 X7 X5 X5 X3 X3 X1 X1
Figure 4-3. MOVSHDUP Operation

Operation

VMOVSHDUP (EVEX encoded versions)

(KL, VL) = (4, 128), (8, 256), (16, 512)
TMP_SRC[31:0] ← SRC[63:32]
TMP_SRC[63:32] ← SRC[63:32]
TMP_SRC[95:64] ← SRC[127:96]
TMP_SRC[127:96] ← SRC[127:96]
IF VL >= 256
    TMP_SRC[159:128] ← SRC[191:160]
    TMP_SRC[191:160] ← SRC[191:160]
    TMP_SRC[223:192] ← SRC[255:224]
    TMP_SRC[255:224] ← SRC[255:224]
FI;
IF VL >= 512
    TMP_SRC[287:256] ← SRC[319:288]
    TMP_SRC[319:288] ← SRC[319:288]
    TMP_SRC[351:320] ← SRC[383:352]
    TMP_SRC[383:352] ← SRC[383:352]
    TMP_SRC[415:384] ← SRC[447:416]
    TMP_SRC[447:416] ← SRC[447:416]
    TMP_SRC[479:448] ← SRC[511:480]
    TMP_SRC[511:480] ← SRC[511:480]
FI;
FOR j←0 TO KL-1
    i←j * 32
    IF k1[j] OR *no writemask*
        THEN DEST[i+31:i]←TMP_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

VMOVSHDUP (VEX.256 encoded version)

DEST[31:0] ← SRC[63:32]
DEST[63:32] ← SRC[63:32]
DEST[95:64] ← SRC[127:96]
DEST[127:96] ← SRC[127:96]
DEST[159:128] ← SRC[191:160]
DEST[191:160] ← SRC[191:160]
DEST[223:192] ← SRC[255:224]
DEST[255:224] ← SRC[255:224]
DEST[MAXVL-1:256] ← 0

VMOVSHDUP (VEX.128 encoded version)

DEST[31:0] ← SRC[63:32]
DEST[63:32] ← SRC[63:32]
DEST[95:64] ← SRC[127:96]
DEST[127:96] ← SRC[127:96]
DEST[MAXVL-1:128] ← 0

MOVSHDUP (128-bit Legacy SSE version)

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

Intel C/C++ Compiler Intrinsic Equivalent

VMOVSHDUP __m512 _mm512_movehdup_ps( __m512 a);

VMOVSHDUP __m512 _mm512_mask_movehdup_ps(__m512 s, __mmask16 k, __m512 a);

VMOVSHDUP __m512 _mm512_maskz_movehdup_ps( __mmask16 k, __m512 a);

VMOVSHDUP __m256 _mm256_mask_movehdup_ps(__m256 s, __mmask8 k, __m256 a);

VMOVSHDUP __m256 _mm256_maskz_movehdup_ps( __mmask8 k, __m256 a);

VMOVSHDUP __m128 _mm_mask_movehdup_ps(__m128 s, __mmask8 k, __m128 a);

VMOVSHDUP __m128 _mm_maskz_movehdup_ps( __mmask8 k, __m128 a);

VMOVSHDUP __m256 _mm256_movehdup_ps (__m256 a);

VMOVSHDUP __m128 _mm_movehdup_ps (__m128 a);

SIMD Floating-Point Exceptions

None

Other Exceptions

Non-EVEX-encoded instruction, see Exceptions Type 4;

EVEX-encoded instruction, see Exceptions Type E4NF.nb.

#UD If EVEX.vvvv != 1111B or VEX.vvvv != 1111B.