diff options
| 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 | 0b0803ae1508ff514dd7b471a2a3bcd1e83cb0ef (patch) | |
| tree | 14c62f7634cd8cca1b6beeef3e942ed56d95d5e0 /test/Transforms/Reassociate | |
| parent | f06c3c29acb5560f27d18f8498cefcd4f58be08b (diff) | |
| download | llvm-0b0803ae1508ff514dd7b471a2a3bcd1e83cb0ef.tar.gz llvm-0b0803ae1508ff514dd7b471a2a3bcd1e83cb0ef.tar.bz2 llvm-0b0803ae1508ff514dd7b471a2a3bcd1e83cb0ef.tar.xz | |
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/Transforms/Reassociate')
| -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 0000000000..c81e9b38de --- /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 +} + |