From: Chris Lattner <sabre@nondot.org>
Date: Tue, 18 Jul 2006 07:07:51 +0000 (+0000)
Subject: simple optimization: don't bother calling "exists" (which calls the syscall
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=ff3d80ff7e167a8b6e84621ed155481c8b6a2bb4;p=oota-llvm.git

simple optimization: don't bother calling "exists" (which calls the syscall
"access").  Instead, just let the open call fail if the file doesn't exist.
This reduces the # syscalls executed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29173 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/System/Unix/MappedFile.inc b/lib/System/Unix/MappedFile.inc
index 148372b0cc3..341ee254890 100644
--- a/lib/System/Unix/MappedFile.inc
+++ b/lib/System/Unix/MappedFile.inc
@@ -40,9 +40,6 @@ struct sys::MappedFileInfo {
 };
 
 void MappedFile::initialize() {
-  if (!path_.exists())
-    throw std::string("Can't open file: ") + path_.toString();
-  
   int mode = 0;
   if (options_ & READ_ACCESS) 
     if (options_ & WRITE_ACCESS)