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| author | Chris Lattner <sabre@nondot.org> | 2008-02-17 21:03:36 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-02-17 21:03:36 +0000 |
| commit | dd12f96c5e2292e398f363cf352d6a95847a8a55 (patch) | |
| tree | b2e7359673f3e5d22968e0882371f02ef0877180 /test/Transforms | |
| parent | 5329bb22e9b6374d62919981c1ef8775b42945eb (diff) | |
Fold (-x + -y) -> -(x+y) which promotes better association, fixing
the second half of PR2047
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47244 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms')
| -rw-r--r-- | test/Transforms/InstCombine/addnegneg.ll | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/addnegneg.ll b/test/Transforms/InstCombine/addnegneg.ll new file mode 100644 index 0000000000..f3b9565a51 --- /dev/null +++ b/test/Transforms/InstCombine/addnegneg.ll @@ -0,0 +1,12 @@ +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep { sub } | count 1 +; PR2047 + +define i32 @l(i32 %a, i32 %b, i32 %c, i32 %d) { +entry: + %b.neg = sub i32 0, %b ; <i32> [#uses=1] + %c.neg = sub i32 0, %c ; <i32> [#uses=1] + %sub4 = add i32 %c.neg, %b.neg ; <i32> [#uses=1] + %sub6 = add i32 %sub4, %d ; <i32> [#uses=1] + ret i32 %sub6 +} + |