[llvm-commits] [llvm] r126101 - /llvm/trunk/lib/Target/README.txt
Chris Lattner
sabre at nondot.org
Sun Feb 20 17:33:38 PST 2011
Author: lattner
Date: Sun Feb 20 19:33:38 2011
New Revision: 126101
URL: http://llvm.org/viewvc/llvm-project?rev=126101&view=rev
Log:
add an idiom that loop idiom could theoretically catch.
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=126101&r1=126100&r2=126101&view=diff
==============================================================================
--- llvm/trunk/lib/Target/README.txt (original)
+++ llvm/trunk/lib/Target/README.txt Sun Feb 20 19:33:38 2011
@@ -287,6 +287,16 @@
return count;
}
+This should be recognized as CLZ: rdar://8459039
+
+unsigned clz_a(unsigned a) {
+ int i;
+ for (i=0;i<32;i++)
+ if (a & (1<<(31-i)))
+ return i;
+ return 32;
+}
+
This sort of thing should be added to the loop idiom pass.
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