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| author | Chris Lattner <sabre@nondot.org> | 2008-02-17 20:51:26 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-02-17 20:51:26 +0000 |
| commit | 4846b31ef91352bbad8a13b6225190e3171ce69d (patch) | |
| tree | 14c62f7634cd8cca1b6beeef3e942ed56d95d5e0 /test | |
| parent | e0afcf245c9ce4f4a3de5873471f54bce9e67f71 (diff) | |
| download | external_llvm-4846b31ef91352bbad8a13b6225190e3171ce69d.zip external_llvm-4846b31ef91352bbad8a13b6225190e3171ce69d.tar.gz external_llvm-4846b31ef91352bbad8a13b6225190e3171ce69d.tar.bz2 | |
Split up subtracts into add+negate if they have a reassociable use or operand
that is also a subtract. This implements PR2047 and Transforms/Reassociate/subtest2.ll
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47241 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/Reassociate/subtest2.ll | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/test/Transforms/Reassociate/subtest2.ll b/test/Transforms/Reassociate/subtest2.ll new file mode 100644 index 0000000..c81e9b3 --- /dev/null +++ b/test/Transforms/Reassociate/subtest2.ll @@ -0,0 +1,13 @@ +; With sub reassociation, constant folding can eliminate the uses of %a. +; +; RUN: llvm-as < %s | opt -reassociate -instcombine | llvm-dis | grep %a | count 1 +; PR2047 + +define i32 @test(i32 %a, i32 %b, i32 %c) nounwind { +entry: + %tmp3 = sub i32 %a, %b ; <i32> [#uses=1] + %tmp5 = sub i32 %tmp3, %c ; <i32> [#uses=1] + %tmp7 = sub i32 %tmp5, %a ; <i32> [#uses=1] + ret i32 %tmp7 +} + |