[llvm-commits] [llvm] r126719 - /llvm/trunk/lib/Target/README.txt

[Chris Lattner]

Author: lattner
Date: Mon Feb 28 18:24:51 2011
New Revision: 126719

URL: http://llvm.org/viewvc/llvm-project?rev=126719&view=rev
Log:
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Modified:
    llvm/trunk/lib/Target/README.txt

Modified: llvm/trunk/lib/Target/README.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/README.txt?rev=126719&r1=126718&r2=126719&view=diff
==============================================================================
--- llvm/trunk/lib/Target/README.txt (original)
+++ llvm/trunk/lib/Target/README.txt Mon Feb 28 18:24:51 2011
@@ -1325,6 +1325,21 @@
 
 //===---------------------------------------------------------------------===//
 
+simplifylibcalls should turn these snprintf idioms into memcpy (GCC PR47917)
+
+char buf1[6], buf2[6], buf3[4], buf4[4];
+int i;
+
+int foo (void) {
+  int ret = snprintf (buf1, sizeof buf1, "abcde");
+  ret += snprintf (buf2, sizeof buf2, "abcdef") * 16;
+  ret += snprintf (buf3, sizeof buf3, "%s", i++ < 6 ? "abc" : "def") * 256;
+  ret += snprintf (buf4, sizeof buf4, "%s", i++ > 10 ? "abcde" : "defgh")*4096;
+  return ret;
+}
+
+//===---------------------------------------------------------------------===//
+
 "gas" uses this idiom:
   else if (strchr ("+-/*%|&^:[]()~", *intel_parser.op_string))
 ..