diff options
| author | Evan Cheng <evan.cheng@apple.com> | 2010-02-10 02:17:34 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2010-02-10 02:17:34 +0000 |
| commit | 046632f272b22a653c204c0ef56eb4076368d4bb (patch) | |
| tree | 3a5a7bc876be00a2593850f5fced7031fa9643d4 /test/CodeGen/X86/zext-trunc.ll | |
| parent | 37145b6e4ce1984b54d7fb79116d57e203437136 (diff) | |
| download | llvm-046632f272b22a653c204c0ef56eb4076368d4bb.tar.gz llvm-046632f272b22a653c204c0ef56eb4076368d4bb.tar.bz2 llvm-046632f272b22a653c204c0ef56eb4076368d4bb.tar.xz | |
Now that ShrinkDemandedOps() is separated out from DAG combine. It sometimes leave some obvious nops which dag combine used to clean up afterwards e.g. (trunk (ext n)) -> n. Look for them and squash them.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95757 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/zext-trunc.ll')
| -rw-r--r-- | test/CodeGen/X86/zext-trunc.ll | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/test/CodeGen/X86/zext-trunc.ll b/test/CodeGen/X86/zext-trunc.ll new file mode 100644 index 0000000000..b9ffbe87b2 --- /dev/null +++ b/test/CodeGen/X86/zext-trunc.ll @@ -0,0 +1,13 @@ +; RUN: llc < %s -march=x86-64 | FileCheck %s +; rdar://7570931 + +define i64 @foo(i64 %a, i64 %b) nounwind { +; CHECK: foo: +; CHECK: leal +; CHECK-NOT: movl +; CHECK: ret + %c = add i64 %a, %b + %d = trunc i64 %c to i32 + %e = zext i32 %d to i64 + ret i64 %e +} |