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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2010-11-06 10:37:16 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2010-11-06 10:37:16 +0000 |
| commit | 019e3787542139a72d0f068d404e2a4caace06e9 (patch) | |
| tree | 3d72fc0c339056310b5de854a71c931427504fab /lib/Target/README.txt | |
| parent | c7a03fbe66116929fab679a34748e1bf552de879 (diff) | |
| download | llvm-019e3787542139a72d0f068d404e2a4caace06e9.tar.gz llvm-019e3787542139a72d0f068d404e2a4caace06e9.tar.bz2 llvm-019e3787542139a72d0f068d404e2a4caace06e9.tar.xz | |
Add a note.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118337 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 e63df536ae..55c08173d2 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -1963,3 +1963,15 @@ bb3: ; preds = %entry ret i32 %b } //===---------------------------------------------------------------------===// +We should fold this code into "ret i1 false" since neither %zero nor %one can +ever be null pointers. + +define i1 @foo(i1 %cond) { + %zero = alloca i32 + %one = alloca i32 + + %ptr = select i1 %cond, i32* %zero, i32* %one + %isnull = icmp eq i32* %ptr, null + ret i1 %isnull +} +//===---------------------------------------------------------------------===// |