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| <title>MULPS—Multiply Packed Single-Precision Floating-Point Values </title></head> |
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| <h1>MULPS—Multiply Packed Single-Precision Floating-Point Values</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>0F 59 /<em>r</em></p> |
| <p>MULPS <em>xmm1</em>, <em>xmm2/m128</em></p></td> |
| <td>RM</td> |
| <td>V/V</td> |
| <td>SSE</td> |
| <td>Multiply packed single-precision floating-point values in <em>xmm2/mem</em> by <em>xmm1</em>.</td></tr> |
| <tr> |
| <td> |
| <p>VEX.NDS.128.0F.WIG 59 /r</p> |
| <p>VMULPS <em>xmm1,xmm2, xmm3/m128</em></p></td> |
| <td>RVM</td> |
| <td>V/V</td> |
| <td>AVX</td> |
| <td>Multiply packed single-precision floating-point values from <em>xmm3/mem</em> to <em>xmm2</em> and stores result in <em>xmm1</em>.</td></tr> |
| <tr> |
| <td> |
| <p>VEX.NDS.256.0F.WIG 59 /r</p> |
| <p>VMULPS <em>ymm1, ymm2, ymm3/m256</em></p></td> |
| <td>RVM</td> |
| <td>V/V</td> |
| <td>AVX</td> |
| <td>Multiply packed single-precision floating-point values from <em>ymm3/mem</em> to <em>ymm2</em> and stores 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>RM</td> |
| <td>ModRM:reg (r, w)</td> |
| <td>ModRM:r/m (r)</td> |
| <td>NA</td> |
| <td>NA</td></tr> |
| <tr> |
| <td>RVM</td> |
| <td>ModRM:reg (w)</td> |
| <td>VEX.vvvv (r)</td> |
| <td>ModRM:r/m (r)</td> |
| <td>NA</td></tr></table> |
| <h2>Description</h2> |
| <p>Performs a SIMD multiply of the four packed single-precision floating-point values from the source operand (second operand) and the destination operand (first operand), and stores the packed single-precision floating-point results in the destination operand. See Figure 10-5 in the <em>Intel® 64 and IA-32 Architectures Software Devel-oper’s Manual, Volume 1</em>, for an illustration of a SIMD single-precision floating-point operation.</p> |
| <p>In 64-bit mode, use of the REX.R prefix permits this instruction to access additional registers (XMM8-XMM15).</p> |
| <p>128-bit Legacy SSE version: The second source can be an XMM register or an 128-bit memory location. The desti-nation is not distinct from the first source XMM register and the upper bits (VLMAX-1:128) of the corresponding YMM register destination are unmodified.</p> |
| <p>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 destination YMM register destination are zeroed.</p> |
| <p>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.</p> |
| <h2>Operation</h2> |
| <p><strong>MULPS (128-bit Legacy SSE version)</strong></p> |
| <pre>DEST[31:0] ← SRC1[31:0] * SRC2[31:0] |
| DEST[63:32] ← SRC1[63:32] * SRC2[63:32] |
| DEST[95:64] ← SRC1[95:64] * SRC2[95:64] |
| DEST[127:96] ← SRC1[127:96] * SRC2[127:96] |
| DEST[VLMAX-1:128] (Unmodified)</pre> |
| <p><strong>VMULPS (VEX.128 encoded version)</strong></p> |
| <pre>DEST[31:0] ← SRC1[31:0] * SRC2[31:0] |
| DEST[63:32] ← SRC1[63:32] * SRC2[63:32] |
| DEST[95:64] ← SRC1[95:64] * SRC2[95:64] |
| DEST[127:96] ← SRC1[127:96] * SRC2[127:96] |
| DEST[VLMAX-1:128] ← 0</pre> |
| <p><strong>VMULPS (VEX.256 encoded version)</strong></p> |
| <pre>DEST[31:0] ← SRC1[31:0] * SRC2[31:0] |
| DEST[63:32] ← SRC1[63:32] * SRC2[63:32] |
| DEST[95:64] ← SRC1[95:64] * SRC2[95:64] |
| DEST[127:96] ← SRC1[127:96] * SRC2[127:96] |
| DEST[159:128] ← SRC1[159:128] * SRC2[159:128] |
| DEST[191:160]← SRC1[191:160] * SRC2[191:160] |
| DEST[223:192] ← SRC1[223:192] * SRC2[223:192] |
| DEST[255:224] ← SRC1[255:224] * SRC2[255:224].</pre> |
| <h2>Intel C/C++ Compiler Intrinsic Equivalent</h2> |
| <p>MULPS:</p> |
| <p>__m128 _mm_mul_ps(__m128 a, __m128 b)</p> |
| <p>VMULPS:</p> |
| <p> __m256 _mm256_mul_ps (__m256 a, __m256 b);</p> |
| <h2>SIMD Floating-Point Exceptions</h2> |
| <p>Overflow, Underflow, Invalid, Precision, Denormal.</p> |
| <h2>Other Exceptions</h2> |
| <p>See Exceptions Type 2</p></body></html> |