# ANDNPS — Bitwise Logical AND NOT of Packed Single Precision Floating-Point Values

Opcode/Instruction | Op / En | 64/32 bit Mode Support | CPUID Feature Flag | Description
--- | --- | --- | --- | ---
NP 0F 55 /r ANDNPS xmm1, xmm2/m128 | A | V/V | SSE | Return the bitwise logical AND NOT of packed single precision floating-point values in xmm1 and xmm2/mem.
VEX.128.0F 55 /r VANDNPS xmm1, xmm2, xmm3/m128 | B | V/V | AVX | Return the bitwise logical AND NOT of packed single precision floating-point values in xmm2 and xmm3/mem.
VEX.256.0F 55 /r VANDNPS ymm1, ymm2, ymm3/m256 | B | V/V | AVX | Return the bitwise logical AND NOT of packed single precision floating-point values in ymm2 and ymm3/mem.
EVEX.128.0F.W0 55 /r VANDNPS xmm1 {k1}{z}, xmm2, xmm3/m128/m32bcst | C | V/V | AVX512VL AVX512DQ | Return the bitwise logical AND of packed single precision floating-point values in xmm2 and xmm3/m128/m32bcst subject to writemask k1.
EVEX.256.0F.W0 55 /r VANDNPS ymm1 {k1}{z}, ymm2, ymm3/m256/m32bcst | C | V/V | AVX512VL AVX512DQ | Return the bitwise logical AND of packed single precision floating-point values in ymm2 and ymm3/m256/m32bcst subject to writemask k1.
EVEX.512.0F.W0 55 /r VANDNPS zmm1 {k1}{z}, zmm2, zmm3/m512/m32bcst | C | V/V | AVX512DQ | Return the bitwise logical AND of packed single precision floating-point values in zmm2 and zmm3/m512/m32bcst subject to writemask k1.

## Instruction Operand Encoding ¶

Op/En | Tuple Type | Operand 1 | Operand 2 | Operand 3 | Operand 4
--- | --- | --- | --- | --- | ---
A | N/A | ModRM:reg (r, w) | ModRM:r/m (r) | N/A | N/A
B | N/A | ModRM:reg (w) | VEX.vvvv (r) | ModRM:r/m (r) | N/A
C | Full | ModRM:reg (w) | EVEX.vvvv (r) | ModRM:r/m (r) | N/A

## Description ¶

Performs a bitwise logical AND NOT of the four, eight or sixteen packed single precision floating-point values from the first source operand and the second source operand, and stores the result in the destination operand.

EVEX encoded versions: The first source 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 32-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 is a YMM register or a 256-bit memory location. The destination operand is a YMM register. The upper bits (MAXVL-1:256) of the corresponding ZMM register destination are zeroed.

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

### VANDNPS (EVEX Encoded Versions) ¶

    (KL, VL) = (4, 128), (8, 256), (16, 512)
    FOR j := 0 TO KL-1
        i := j * 32
        IF k1[j] OR *no writemask*
                IF (EVEX.b == 1) AND (SRC2 *is memory*)
                    THEN
                        DEST[i+31:i] := (NOT(SRC1[i+31:i])) BITWISE AND SRC2[31:0]
                    ELSE
                        DEST[i+31:i] := (NOT(SRC1[i+31:i])) BITWISE AND SRC2[i+31:i]
                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] := 0

### VANDNPS (VEX.256 Encoded Version) ¶

    DEST[31:0] := (NOT(SRC1[31:0])) BITWISE AND SRC2[31:0]
    DEST[63:32] := (NOT(SRC1[63:32])) BITWISE AND SRC2[63:32]
    DEST[95:64] := (NOT(SRC1[95:64])) BITWISE AND SRC2[95:64]
    DEST[127:96] := (NOT(SRC1[127:96])) BITWISE AND SRC2[127:96]
    DEST[159:128] := (NOT(SRC1[159:128])) BITWISE AND SRC2[159:128]
    DEST[191:160] := (NOT(SRC1[191:160])) BITWISE AND SRC2[191:160]
    DEST[223:192] := (NOT(SRC1[223:192])) BITWISE AND SRC2[223:192]
    DEST[255:224] := (NOT(SRC1[255:224])) BITWISE AND SRC2[255:224].
    DEST[MAXVL-1:256] := 0

### VANDNPS (VEX.128 Encoded Version) ¶

    DEST[31:0] := (NOT(SRC1[31:0])) BITWISE AND SRC2[31:0]
    DEST[63:32] := (NOT(SRC1[63:32])) BITWISE AND SRC2[63:32]
    DEST[95:64] := (NOT(SRC1[95:64])) BITWISE AND SRC2[95:64]
    DEST[127:96] := (NOT(SRC1[127:96])) BITWISE AND SRC2[127:96]
    DEST[MAXVL-1:128] := 0

### ANDNPS (128-bit Legacy SSE Version) ¶

    DEST[31:0] := (NOT(DEST[31:0])) BITWISE AND SRC[31:0]
    DEST[63:32] := (NOT(DEST[63:32])) BITWISE AND SRC[63:32]
    DEST[95:64] := (NOT(DEST[95:64])) BITWISE AND SRC[95:64]
    DEST[127:96] := (NOT(DEST[127:96])) BITWISE AND SRC[127:96]
    DEST[MAXVL-1:128] (Unmodified)

## Intel C/C++ Compiler Intrinsic Equivalent ¶

    VANDNPS __m512 _mm512_andnot_ps (__m512 a, __m512 b);

    VANDNPS __m512 _mm512_mask_andnot_ps (__m512 s, __mmask16 k, __m512 a, __m512 b);

    VANDNPS __m512 _mm512_maskz_andnot_ps (__mmask16 k, __m512 a, __m512 b);

    VANDNPS __m256 _mm256_mask_andnot_ps (__m256 s, __mmask8 k, __m256 a, __m256 b);

    VANDNPS __m256 _mm256_maskz_andnot_ps (__mmask8 k, __m256 a, __m256 b);

    VANDNPS __m128 _mm_mask_andnot_ps (__m128 s, __mmask8 k, __m128 a, __m128 b);

    VANDNPS __m128 _mm_maskz_andnot_ps (__mmask8 k, __m128 a, __m128 b);

    VANDNPS __m256 _mm256_andnot_ps (__m256 a, __m256 b);

    ANDNPS __m128 _mm_andnot_ps (__m128 a, __m128 b);

## SIMD Floating-Point Exceptions ¶

None.

## Other Exceptions ¶

VEX-encoded instruction, see Table 2-21, “Type 4 Class Exception Conditions.”

EVEX-encoded instruction, see Table 2-49, “Type E4 Class Exception Conditions.”