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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2012-03-27 22:03:19 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2012-03-27 22:03:19 +0000 |
| commit | c8591a451a41627f2db13ac849f2b00272b7a898 (patch) | |
| tree | 98990a39ce0360d1de50af0a0e4893bc44b798e5 /lib/Target/README.txt | |
| parent | 66e30f8db180bdc0fba637c84e7b72396a08d8f2 (diff) | |
| download | llvm-c8591a451a41627f2db13ac849f2b00272b7a898.tar.gz llvm-c8591a451a41627f2db13ac849f2b00272b7a898.tar.bz2 llvm-c8591a451a41627f2db13ac849f2b00272b7a898.tar.xz | |
Add two missed instcombines related to compares with nsw arithmetic.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153542 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/README.txt')
| -rw-r--r-- | lib/Target/README.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index 1f69ffb09c..2d4925d307 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -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 |