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Add two missed instcombines related to compares with nsw arithmetic.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153542 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2012-03-27 22:03:19 +00:00
parent 66e30f8db1
commit c8591a451a
1 changed files with 12 additions and 0 deletions
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12
lib/Target/README.txt
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@ -961,6 +961,18 @@ optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
//===---------------------------------------------------------------------===//
int g(int x) { return (x - 10) < 0; }
Should combine to "x <= 9" (the sub has nsw). Currently not
optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
//===---------------------------------------------------------------------===//
int g(int x) { return (x + 10) < 0; }
Should combine to "x < -10" (the add 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:
%tmp = icmp eq i32 %decl_context, 4