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76 lines
3.3 KiB
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<html xmlns="http://www.w3.org/1999/xhtml" xmlns:svg="http://www.w3.org/2000/svg" xmlns:x86="http://www.felixcloutier.com/x86"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><link rel="stylesheet" type="text/css" href="style.css"></link><title>SHA1MSG2
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— Perform a Final Calculation for the Next Four SHA1 Message Dwords</title></head><body><header><nav><ul><li><a href='index.html'>Index</a></li><li>December 2023</li></ul></nav></header><h1>SHA1MSG2
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— Perform a Final Calculation for the Next Four SHA1 Message Dwords</h1>
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<table>
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<tr>
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<th>Opcode/Instruction</th>
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<th>Op/En</th>
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<th>64/32 bit Mode Support</th>
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<th>CPUID Feature Flag</th>
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<th>Description</th></tr>
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<tr>
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<td>NP 0F 38 CA /r SHA1MSG2 xmm1, xmm2/m128</td>
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<td>RM</td>
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<td>V/V</td>
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<td>SHA</td>
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<td>Performs the final calculation for the next four SHA1 message dwords using intermediate results from xmm1 and the previous message dwords from xmm2/m128, storing the result in xmm1.</td></tr></table>
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<h2 id="instruction-operand-encoding">Instruction Operand Encoding<a class="anchor" href="#instruction-operand-encoding">
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¶
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</a></h2>
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<table>
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<tr>
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<th>Op/En</th>
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<th>Operand 1</th>
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<th>Operand 2</th>
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<th>Operand 3</th></tr>
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<tr>
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<td>RM</td>
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<td>ModRM:reg (r, w)</td>
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<td>ModRM:r/m (r)</td>
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<td>N/A</td></tr></table>
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<h2 id="description">Description<a class="anchor" href="#description">
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¶
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</a></h2>
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<p>The SHA1MSG2 instruction is one of two SHA1 message scheduling instructions. The instruction performs the final calculation to derive the next four SHA1 message dwords.</p>
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<h2 id="operation">Operation<a class="anchor" href="#operation">
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¶
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</a></h2>
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<h3 id="sha1msg2">SHA1MSG2<a class="anchor" href="#sha1msg2">
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¶
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</a></h3>
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<pre>W13 := SRC2[95:64] ;
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W14 := SRC2[63: 32] ;
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W15 := SRC2[31: 0] ;
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W16 := (SRC1[127:96] XOR W13 ) ROL 1;
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W17 := (SRC1[95:64] XOR W14) ROL 1;
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W18 := (SRC1[63: 32] XOR W15) ROL 1;
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W19 := (SRC1[31: 0] XOR W16) ROL 1;
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DEST[127:96] := W16;
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DEST[95:64] := W17;
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DEST[63:32] := W18;
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DEST[31:0] := W19;
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</pre>
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<h2 id="intel-c-c++-compiler-intrinsic-equivalent">Intel C/C++ Compiler Intrinsic Equivalent<a class="anchor" href="#intel-c-c++-compiler-intrinsic-equivalent">
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¶
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</a></h2>
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<pre>SHA1MSG2 __m128i _mm_sha1msg2_epu32(__m128i, __m128i);
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</pre>
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<h2 id="flags-affected">Flags Affected<a class="anchor" href="#flags-affected">
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¶
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</a></h2>
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<p>None.</p>
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<h2 class="exceptions" id="simd-floating-point-exceptions">SIMD Floating-Point Exceptions<a class="anchor" href="#simd-floating-point-exceptions">
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¶
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</a></h2>
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<p>None.</p>
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<h2 class="exceptions" id="other-exceptions">Other Exceptions<a class="anchor" href="#other-exceptions">
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¶
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</a></h2>
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<p>See <span class="not-imported">Table 2-21</span>, “Type 4 Class Exception Conditions.”</p><footer><p>
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This UNOFFICIAL, mechanically-separated, non-verified reference is provided for convenience, but it may be
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inc<span style="opacity: 0.2">omp</span>lete or b<sub>r</sub>oke<sub>n</sub> in various obvious or non-obvious
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ways. Refer to <a href="https://software.intel.com/en-us/download/intel-64-and-ia-32-architectures-sdm-combined-volumes-1-2a-2b-2c-2d-3a-3b-3c-3d-and-4">Intel® 64 and IA-32 Architectures Software Developer’s Manual</a> for anything serious.
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</p></footer></body></html>
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