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

Opcode/Instruction	Op/En	64/32-bit Mode	CPUID Feature Flag	Description
0F 55 /r ANDNPS xmm1, xmm2/m128	RM	V/V	SSE	Bitwise logical AND NOT of xmm2/m128 and xmm1.
VEX.NDS.128.0F.WIG 55 /r VANDNPS xmm1, xmm2, xmm3/m128	RVM	V/V	AVX	Return the bitwise logical AND NOT of packed single-precision floating-point values in xmm2 and xmm3/mem.
VEX.NDS.256.0F.WIG 55 /r VANDNPS ymm1, ymm2, ymm3/m256	RVM	V/V	AVX	Return the bitwise logical AND NOT of packed single-precision floating-point values in ymm2 and ymm3/mem.

Instruction Operand Encoding

Op/En	Operand 1	Operand 2	Operand 3	Operand 4
RM	ModRM:reg (r, w)	ModRM:r/m (r)	NA	NA
RVM	ModRM:reg (w)	VEX.vvvv (r)	ModRM:r/m (r)	NA

Description

Inverts the bits of the four packed single-precision floating-point values in the destination operand (first operand), performs a bitwise logical AND of the four packed single-precision floating-point values in the source operand (second operand) and the temporary inverted result, and stores the result in the destination operand.

In 64-bit mode, using a REX prefix in the form of REX.R permits this instruction to access additional registers (XMM8-XMM15). 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 (VLMAX-1:128) of the corresponding YMM register destination are unmodified. VEX.128 encoded version: the first source operand is an XMM register or 128-bit memory location. The destination operand is an XMM register. The upper bits (VLMAX-1:128) of the corresponding YMM register destination are zeroed. 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.

Operation

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[VLMAX-1:128] (Unmodified)
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[VLMAX-1:128] ← 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].

Intel C/C++ Compiler Intrinsic Equivalent

ANDNPS:	__m128 _mm_andnot_ps(__m128 a, __m128 b)
VANDNPS:	__m256 _mm256_andnot_ps (__m256 a, __m256 b)

SIMD Floating-Point Exceptions

None.

Other Exceptions

See Exceptions Type 4.