MOVSHDUP — Replicate Single Precision Floating-Point Values

Instruction Operand Encoding ¶

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.

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 Table 2-21, “Type 4 Class Exception Conditions.”

EVEX-encoded instruction, see Exceptions Type E4NF.nb in Table 2-50, “Type E4NF Class Exception Conditions.”

Additionally: