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Add another note about a missed compare with nsw arithmetic instcombine.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153574 91177308-0d34-0410-b5e6-96231b3b80d8
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Benjamin Kramer 2012-03-28 10:50:18 +00:00
parent 6e9d66c756
commit 9b58464330
1 changed files with 7 additions and 0 deletions
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7
lib/Target/README.txt
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@ -973,6 +973,13 @@ optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
//===---------------------------------------------------------------------===// //===---------------------------------------------------------------------===//
int f(int i, int j) { return i < j + 1; }
int g(int i, int j) { return j > i - 1; }
Should combine to "i <= j" (the add/sub has nsw). 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