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| author | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 18:28:14 -0800 |
|---|---|---|
| committer | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 18:28:14 -0800 |
| commit | f72d5de56a522ac3be03873bdde26f23a5eeeb3c (patch) | |
| tree | 4b825dc642cb6eb9a060e54bf8d69288fbee4904 /docs/opcodes/opcode-2d-cmp-kind.html | |
| parent | 31e30105703263782efd450d356cd67ea01af3b7 (diff) | |
| download | android_dalvik-f72d5de56a522ac3be03873bdde26f23a5eeeb3c.tar.gz android_dalvik-f72d5de56a522ac3be03873bdde26f23a5eeeb3c.tar.bz2 android_dalvik-f72d5de56a522ac3be03873bdde26f23a5eeeb3c.zip | |
auto import from //depot/cupcake/@135843
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| -rw-r--r-- | docs/opcodes/opcode-2d-cmp-kind.html | 121 |
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diff --git a/docs/opcodes/opcode-2d-cmp-kind.html b/docs/opcodes/opcode-2d-cmp-kind.html deleted file mode 100644 index 431ccd40d..000000000 --- a/docs/opcodes/opcode-2d-cmp-kind.html +++ /dev/null @@ -1,121 +0,0 @@ -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> - -<html> - -<head> -<title>cmp<kind></title> -<link rel=stylesheet href="opcode.css"> -</head> - -<body> - -<h1>cmp<kind></h1> - -<h2>Purpose</h2> - -<p> -Perform the indicated floating point or long comparison, storing 0 if the two -arguments are equal, 1 if the second argument is larger, or -1 if the first -argument is larger. The "bias" listed for the floating point operations -indicates how NaN comparisons are treated: "Gt bias" instructions return 1 for -NaN comparisons, and "lt bias" instructions return -1. -</p> -<p> -For example, to check to see if floating point a < b, then it is advisable to -use cmpg-float; a result of -1 indicates that the test was true, and the other -values indicate it was false either due to a valid comparison or because one -or the other values was NaN. -</p> - -<h2>Details</h2> - -<table class="instruc"> -<thead> -<tr> - <th>Op & Format</th> - <th>Mnemonic / Syntax</th> - <th>Arguments</th> -</tr> -</thead> -<tbody> -<tr> - <td>2d..31 23x</td> - <td>cmp<i>kind</i> vAA, vBB, vCC<br/> - 2d: cmpl-float <i>(lt bias)</i><br/> - 2e: cmpg-float <i>(gt bias)</i><br/> - 2f: cmpl-double <i>(lt bias)</i><br/> - 30: cmpg-double <i>(gt bias)</i><br/> - 31: cmp-long - </td> - <td><code>A:</code> destination register (8 bits)<br/> - <code>B:</code> first source register or pair<br/> - <code>C:</code> second source register or pair</td> -</tr> -</tbody> -</table> - -<h2>Constraints</h2> - -<ul> - <li> - A, B and C must be valid register indices in the current stack frame. - </li> - <li> - For the two -float variants, both vB and vC must be of type float. - </li> - <li> - For the two -double variants, both vB and vC must be the lower part of a - register pair holding a double value. - </li> - <li> - For the -long variant, both both vB and vC must be the lower part of a - register pair holding a long value. - </li> -</ul> - -<h2>Behavior</h2> - -<ul> - <li> - The values of registers vB and vC are compared. The result, which is stored - in vA, is one of the following three: - <ul> - <li> - If vB < vC, then vA'=-1. - </li> - <li> - If vB == vC, then vA'=0. - </li> - <li> - If vC > vC, then vA'=1. - </li> - </ul> - </li> - <li> - For the -float and -double variants, an addition "bias" specifies what - happens if one or both of the arguments are NaN: - <ul> - <li> - A "lt bias" results in vA'=-1. - </li> - <li> - A "gt bias" results in vA'=1. - </li> - </ul> - </li> - <li> - If v(A-1) is the lower half of a register pair, v(A-1)' becomes undefined. - </li> - <li> - If v(A+1) is the upper half of a register pair, v(A+1)' becomes undefined. - </li> -</ul> - -<h2>Exceptions</h2> - -<p> -None. -</p> - -</body> -</html> |