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| <title>VPERMPD — Permute Double-Precision Floating-Point Elements </title></head> |
| <body> |
| <h1>VPERMPD — Permute Double-Precision Floating-Point Elements</h1> |
| <table> |
| <tr> |
| <th>Opcode/Instruction</th> |
| <th>Op/En</th> |
| <th>64/32 -bit Mode</th> |
| <th>CPUID Feature Flag</th> |
| <th>Description</th></tr> |
| <tr> |
| <td> |
| <p>VEX.256.66.0F3A.W1 01 /r ib</p> |
| <p>VPERMPD <em>ymm1, ymm2/m256, imm8</em></p></td> |
| <td>RMI</td> |
| <td>V/V</td> |
| <td>AVX2</td> |
| <td>Permute double-precision floating-point elements in <em>ymm2/m256</em> using indexes in <em>imm8</em> and store the result in <em>ymm1</em>.</td></tr></table> |
| <h3>Instruction Operand Encoding</h3> |
| <table> |
| <tr> |
| <td>Op/En</td> |
| <td>Operand 1</td> |
| <td>Operand 2</td> |
| <td>Operand 3</td> |
| <td>Operand 4</td></tr> |
| <tr> |
| <td>RMI</td> |
| <td>ModRM:reg (w)</td> |
| <td>ModRM:r/m (r)</td> |
| <td>Imm8</td> |
| <td>NA</td></tr></table> |
| <h2>Description</h2> |
| <p>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.</p> |
| <p>An attempt to execute VPERMPD encoded with VEX.L= 0 will cause an #UD exception.</p> |
| <h2>Operation</h2> |
| <p><strong>VPERMPD (VEX.256 encoded version)</strong></p> |
| <pre>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];</pre> |
| <h2>Intel C/C++ Compiler Intrinsic Equivalent</h2> |
| <p>VPERMPD: __m256d _mm256_permute4x64_pd(__m256d a, int control) ;</p> |
| <h2>SIMD Floating-Point Exceptions</h2> |
| <p>None</p> |
| <h2>Other Exceptions</h2> |
| <p>See Exceptions Type 4; additionally</p> |
| <table class="exception-table"> |
| <tr> |
| <td>#UD</td> |
| <td>If VEX.L = 0.</td></tr></table></body></html> |