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 <title>CVTTPS2PI—Convert with Truncation Packed Single-Precision FP Values to Packed Dword Integers </title></head>
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 <h1>CVTTPS2PI—Convert with Truncation Packed Single-Precision FP Values to Packed Dword Integers</h1>
 <table>
 <tr>
 <th>Opcode/Instruction</th>
 <th>Op/En</th>
 <th>64-Bit Mode</th>
 <th>Compat/Leg Mode</th>
 <th>Description</th></tr>
 <tr>
 <td>
 <p>0F 2C /r</p>
 <p>CVTTPS2PI <em>mm</em>, <em>xmm/m64</em></p></td>
 <td>RM</td>
 <td>Valid</td>
 <td>Valid</td>
 <td>Convert two single-precision floating-point values from <em>xmm</em>/<em>m64</em> to two signed doubleword signed integers in <em>mm</em> using truncation.</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 (w)</td>
 <td>ModRM:r/m (r)</td>
 <td>NA</td>
 <td>NA</td></tr></table>
 <h2>Description</h2>
 <p>Converts two packed single-precision floating-point values in the source operand (second operand) to two packed signed doubleword integers in the destination operand (first operand). The source operand can be an XMM register or a 64-bit memory location. The destination operand is an MMX technology register. When the source operand is an XMM register, the two single-precision floating-point values are contained in the low quadword of the register.</p>
 <p>When a conversion is inexact, a truncated (round toward zero) result is returned. If a converted result is larger than the maximum signed doubleword integer, the floating-point invalid exception is raised, and if this exception is masked, the indefinite integer value (80000000H) is returned.</p>
 <p>This instruction causes a transition from x87 FPU to MMX technology operation (that is, the x87 FPU top-of-stack pointer is set to 0 and the x87 FPU tag word is set to all 0s [valid]). If this instruction is executed while an x87 FPU floating-point exception is pending, the exception is handled before the CVTTPS2PI instruction is executed.</p>
 <p>In 64-bit mode, use of the REX.R prefix permits this instruction to access additional registers (XMM8-XMM15).</p>
 <h2>Operation</h2>
 <pre>DEST[31:0] ← Convert_Single_Precision_Floating_Point_To_Integer_Truncate(SRC[31:0]);
 DEST[63:32] ← Convert_Single_Precision_Floating_Point_To_Integer_Truncate(SRC[63:32]);</pre>
 <h2>Intel C/C++ Compiler Intrinsic Equivalent</h2>
 <p>CVTTPS2PI:</p>
 <p>__m64 _mm_cvttps_pi32(__m128 a)</p>
 <h2>SIMD Floating-Point Exceptions</h2>
 <p>Invalid, Precision.</p>
 <h2>Other Exceptions</h2>
 <p>See Table 22-5, “Exception Conditions for Legacy SIMD/MMX Instructions with XMM and FP Exception,” in the <em>Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 3B</em>.</p></body></html>
	<!DOCTYPE html>

	<html>
	<head>
	<meta charset="UTF-8">
	<link href="style.css" type="text/css" rel="stylesheet">
	<title>CVTTPS2PI—Convert with Truncation Packed Single-Precision FP Values to Packed Dword Integers </title></head>
	<body>
	<h1>CVTTPS2PI—Convert with Truncation Packed Single-Precision FP Values to Packed Dword Integers</h1>
	<table>
	<tr>
	<th>Opcode/Instruction</th>
	<th>Op/En</th>
	<th>64-Bit Mode</th>
	<th>Compat/Leg Mode</th>
	<th>Description</th></tr>
	<tr>
	<td>
	<p>0F 2C /r</p>
	<p>CVTTPS2PI <em>mm</em>, <em>xmm/m64</em></p></td>
	<td>RM</td>
	<td>Valid</td>
	<td>Valid</td>
	<td>Convert two single-precision floating-point values from <em>xmm</em>/<em>m64</em> to two signed doubleword signed integers in <em>mm</em> using truncation.</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 (w)</td>
	<td>ModRM:r/m (r)</td>
	<td>NA</td>
	<td>NA</td></tr></table>
	<h2>Description</h2>
	<p>Converts two packed single-precision floating-point values in the source operand (second operand) to two packed signed doubleword integers in the destination operand (first operand). The source operand can be an XMM register or a 64-bit memory location. The destination operand is an MMX technology register. When the source operand is an XMM register, the two single-precision floating-point values are contained in the low quadword of the register.</p>
	<p>When a conversion is inexact, a truncated (round toward zero) result is returned. If a converted result is larger than the maximum signed doubleword integer, the floating-point invalid exception is raised, and if this exception is masked, the indefinite integer value (80000000H) is returned.</p>
	<p>This instruction causes a transition from x87 FPU to MMX technology operation (that is, the x87 FPU top-of-stack pointer is set to 0 and the x87 FPU tag word is set to all 0s [valid]). If this instruction is executed while an x87 FPU floating-point exception is pending, the exception is handled before the CVTTPS2PI instruction is executed.</p>
	<p>In 64-bit mode, use of the REX.R prefix permits this instruction to access additional registers (XMM8-XMM15).</p>
	<h2>Operation</h2>
	<pre>DEST[31:0] ← Convert_Single_Precision_Floating_Point_To_Integer_Truncate(SRC[31:0]);
	DEST[63:32] ← Convert_Single_Precision_Floating_Point_To_Integer_Truncate(SRC[63:32]);</pre>
	<h2>Intel C/C++ Compiler Intrinsic Equivalent</h2>
	<p>CVTTPS2PI:</p>
	<p>__m64 _mm_cvttps_pi32(__m128 a)</p>
	<h2>SIMD Floating-Point Exceptions</h2>
	<p>Invalid, Precision.</p>
	<h2>Other Exceptions</h2>
	<p>See Table 22-5, “Exception Conditions for Legacy SIMD/MMX Instructions with XMM and FP Exception,” in the <em>Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 3B</em>.</p></body></html>