From 477a98824aaa173e8b4c327a82426de5c1197923 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Mon, 21 Feb 2011 01:33:38 +0000 Subject: [PATCH] add an idiom that loop idiom could theoretically catch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126101 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/README.txt | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/lib/Target/README.txt b/lib/Target/README.txt index 4e14fbbb09b..bda764deffe 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -287,6 +287,16 @@ unsigned int popcount(unsigned int input) { 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. //===---------------------------------------------------------------------===// -- 2.34.1