VPERMPD — Permute Double-Precision Floating-Point Elements

Opcode/Instruction Op/En 64/32 -bit Mode CPUID Feature Flag Description

VEX.256.66.0F3A.W1 01 /r ib

VPERMPD ymm1, ymm2/m256, imm8

 RMI V/V AVX2 Permute double-precision floating-point elements in ymm2/m256 using indexes in imm8 and store the result in ymm1.

Instruction Operand Encoding

Op/En Operand 1 Operand 2 Operand 3 Operand 4
RMI ModRM:reg (w) ModRM:r/m (r) Imm8 NA

Description

Use two-bit index values in the immediate byte to select a double-precision floating-point element in the source operand; the resultant data from the source operand is copied to the corresponding element of the destination operand in the order of the index field. Note that this instruction permits a qword in the source operand to be copied to multiple location in the destination operand.

An attempt to execute VPERMPD encoded with VEX.L= 0 will cause an #UD exception.

Operation

VPERMPD (VEX.256 encoded version)

DEST[63:0] ← (SRC[255:0] >> (IMM8[1:0] * 64))[63:0];
DEST[127:64] ← (SRC[255:0] >> (IMM8[3:2] * 64))[63:0];
DEST[191:128] ← (SRC[255:0] >> (IMM8[5:4] * 64))[63:0];
DEST[255:192] ← (SRC[255:0] >> (IMM8[7:6] * 64))[63:0];

Intel C/C++ Compiler Intrinsic Equivalent

VPERMPD: __m256d _mm256_permute4x64_pd(__m256d a, int control) ;

SIMD Floating-Point Exceptions

None

Other Exceptions

See Exceptions Type 4; additionally

#UD If VEX.L = 0.