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Add a microoptimization note.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159082 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2012-06-23 15:19:31 +00:00
parent 50b4c52633
commit d52998a815
1 changed files with 6 additions and 0 deletions
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6
lib/Target/README.txt
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@ -964,6 +964,12 @@ optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
//===---------------------------------------------------------------------===// //===---------------------------------------------------------------------===//
unsigned f(unsigned x) { return ((x & 7) + 1) & 15; }
The & 15 part should be optimized away, it doesn't change the result. Currently
not optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
//===---------------------------------------------------------------------===//
This was noticed in the entryblock for grokdeclarator in 403.gcc: This was noticed in the entryblock for grokdeclarator in 403.gcc:
%tmp = icmp eq i32 %decl_context, 4 %tmp = icmp eq i32 %decl_context, 4