diff --git a/src/Composer/DependencyResolver/Pool.php b/src/Composer/DependencyResolver/Pool.php
index 05645c87a..13a233155 100644
--- a/src/Composer/DependencyResolver/Pool.php
+++ b/src/Composer/DependencyResolver/Pool.php
@@ -45,6 +45,7 @@ class Pool
     protected $providerRepos = array();
     protected $packages = array();
     protected $packageByName = array();
+    protected $packageByExactName = array();
     protected $acceptableStabilities;
     protected $stabilityFlags;
     protected $versionParser;
@@ -122,6 +123,7 @@ class Pool
                         $package['id'] = $this->id++;
                         $package['stability'] = $stability;
                         $this->packages[] = $package;
+                        $this->packageByExactName[$package->getName()][$package['id']] = $this->packages[$this->id - 2];
 
                         foreach ($names as $provided) {
                             $this->packageByName[$provided][$package['id']] = $this->packages[$this->id - 2];
@@ -144,6 +146,7 @@ class Pool
                             $alias['id'] = $this->id++;
                             $alias['root_alias'] = true;
                             $this->packages[] = $alias;
+                            $this->packageByExactName[$package->getName()][$alias['id']] = $this->packages[$this->id - 2];
 
                             foreach ($names as $provided) {
                                 $this->packageByName[$provided][$alias['id']] = $this->packages[$this->id - 2];
@@ -159,6 +162,7 @@ class Pool
                             $alias['alias_of'] = $package['id'];
                             $alias['id'] = $this->id++;
                             $this->packages[] = $alias;
+                            $this->packageByExactName[$package->getName()][$alias['id']] = $this->packages[$this->id - 2];
 
                             foreach ($names as $provided) {
                                 $this->packageByName[$provided][$alias['id']] = $this->packages[$this->id - 2];
@@ -173,6 +177,7 @@ class Pool
                     if ($exempt || $this->isPackageAcceptable($names, $stability)) {
                         $package->setId($this->id++);
                         $this->packages[] = $package;
+                        $this->packageByExactName[$package->getName()][$package->getId()] = $package;
 
                         foreach ($names as $provided) {
                             $this->packageByName[$provided][] = $package;
@@ -191,6 +196,7 @@ class Pool
 
                             $package->getRepository()->addPackage($aliasPackage);
                             $this->packages[] = $aliasPackage;
+                            $this->packageByExactName[$aliasPackage->getName()][$aliasPackage->getId()] = $aliasPackage;
 
                             foreach ($aliasPackage->getNames() as $name) {
                                 $this->packageByName[$name][] = $aliasPackage;
@@ -261,7 +267,14 @@ class Pool
             }
         }
 
-        if (isset($this->packageByName[$name])) {
+        if ($mustMatchName) {
+            $candidates = array_filter($candidates, function ($candidate) use ($name) {
+                return $candidate->getName() == $name;
+            });
+            if (isset($this->packageByExactName[$name])) {
+                $candidates = array_merge($candidates, $this->packageByExactName[$name]);
+            }
+        } elseif (isset($this->packageByName[$name])) {
             $candidates = array_merge($candidates, $this->packageByName[$name]);
         }
 
@@ -313,12 +326,6 @@ class Pool
             }
         }
 
-        if ($mustMatchName) {
-            return array_filter($matches, function ($match) use ($name) {
-                return $match->getName() == $name;
-            });
-        }
-
         // if a package with the required name exists, we ignore providers
         if ($nameMatch) {
             return $matches;
diff --git a/src/Composer/DependencyResolver/RuleSetGenerator.php b/src/Composer/DependencyResolver/RuleSetGenerator.php
index fa58687ea..ed0ab72a5 100644
--- a/src/Composer/DependencyResolver/RuleSetGenerator.php
+++ b/src/Composer/DependencyResolver/RuleSetGenerator.php
@@ -263,30 +263,6 @@ class RuleSetGenerator
         return $impossible;
     }
 
-    /**
-     * Adds all rules for all update packages of a given package
-     *
-     * @param PackageInterface $package Rules for this package's updates are to
-     *                                  be added
-     */
-    private function addRulesForUpdatePackages(PackageInterface $package, $ignorePlatformReqs)
-    {
-        $updates = $this->policy->findUpdatePackages($this->pool, $this->installedMap, $package);
-
-        foreach ($updates as $update) {
-            $this->addRulesForPackage($update, $ignorePlatformReqs);
-        }
-    }
-
-    private function whitelistFromUpdatePackages(PackageInterface $package)
-    {
-        $updates = $this->policy->findUpdatePackages($this->pool, $this->installedMap, $package, true);
-
-        foreach ($updates as $update) {
-            $this->whitelistFromPackage($update);
-        }
-    }
-
     protected function whitelistFromJobs()
     {
         foreach ($this->jobs as $job) {
@@ -344,7 +320,6 @@ class RuleSetGenerator
         $this->whitelistedMap = array();
         foreach ($this->installedMap as $package) {
             $this->whitelistFromPackage($package);
-            $this->whitelistFromUpdatePackages($package);
         }
         $this->whitelistFromJobs();
 
@@ -353,7 +328,6 @@ class RuleSetGenerator
         $this->addedMap = array();
         foreach ($this->installedMap as $package) {
             $this->addRulesForPackage($package, $ignorePlatformReqs);
-            $this->addRulesForUpdatePackages($package, $ignorePlatformReqs);
         }
 
         $this->addRulesForJobs($ignorePlatformReqs);
diff --git a/src/Composer/Repository/ComposerRepository.php b/src/Composer/Repository/ComposerRepository.php
index 134a47c2a..4bfe6db4e 100644
--- a/src/Composer/Repository/ComposerRepository.php
+++ b/src/Composer/Repository/ComposerRepository.php
@@ -381,25 +381,6 @@ class ComposerRepository extends ArrayRepository implements StreamableRepository
                         }
                     }
                 } else {
-                    if (isset($version['provide']) || isset($version['replace'])) {
-                        // collect names
-                        $names = array(
-                            strtolower($version['name']) => true,
-                        );
-                        if (isset($version['provide'])) {
-                            foreach ($version['provide'] as $target => $constraint) {
-                                $names[strtolower($target)] = true;
-                            }
-                        }
-                        if (isset($version['replace'])) {
-                            foreach ($version['replace'] as $target => $constraint) {
-                                $names[strtolower($target)] = true;
-                            }
-                        }
-                        $names = array_keys($names);
-                    } else {
-                        $names = array(strtolower($version['name']));
-                    }
                     if (!$pool->isPackageAcceptable(strtolower($version['name']), VersionParser::parseStability($version['version']))) {
                         continue;
                     }