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| author | Evan Cheng <evan.cheng@apple.com> | 2012-03-13 22:00:52 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2012-03-13 22:00:52 +0000 |
| commit | 84387ea5f547f3b63dc701fdcac163b8dc797e5d (patch) | |
| tree | 7fc52ddec9ad9ce460ffd89810267a170527c274 /test/CodeGen | |
| parent | f210b68b41704cb602feffa4ebb334220abda407 (diff) | |
| download | external_llvm-84387ea5f547f3b63dc701fdcac163b8dc797e5d.zip external_llvm-84387ea5f547f3b63dc701fdcac163b8dc797e5d.tar.gz external_llvm-84387ea5f547f3b63dc701fdcac163b8dc797e5d.tar.bz2 | |
DAG combine incorrectly optimize (i32 vextract (v4i16 load $addr), c) to
(i16 load $addr+c*sizeof(i16)) and replace uses of (i32 vextract) with the
i16 load. It should issue an extload instead: (i32 extload $addr+c*sizeof(i16)).
rdar://11035895
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152675 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen')
| -rw-r--r-- | test/CodeGen/ARM/2012-03-13-DAGCombineBug.ll | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/2012-03-13-DAGCombineBug.ll b/test/CodeGen/ARM/2012-03-13-DAGCombineBug.ll new file mode 100644 index 0000000..6d596df --- /dev/null +++ b/test/CodeGen/ARM/2012-03-13-DAGCombineBug.ll @@ -0,0 +1,16 @@ +; RUN: llc < %s -mtriple=thumbv7-apple-ios | FileCheck %s +; rdar://11035895 + +; DAG combine incorrectly optimize (i32 vextract (v4i16 load $addr), c) to +; (i16 load $addr+c*sizeof(i16)). It should have issued an extload instead. i.e. +; (i32 extload $addr+c*sizeof(i16) +define void @test_hi_short3(<3 x i16> * nocapture %srcA, <2 x i16> * nocapture %dst) nounwind { +entry: +; CHECK: ldrh [[REG:r[0-9]+]] +; CHECK: strh [[REG]] + %0 = load <3 x i16> * %srcA, align 8 + %1 = shufflevector <3 x i16> %0, <3 x i16> undef, <2 x i32> <i32 2, i32 undef> + store <2 x i16> %1, <2 x i16> * %dst, align 4 + ret void +} + |