diff options
| author | Nadav Rotem <nrotem@apple.com> | 2012-10-03 19:30:31 +0000 |
|---|---|---|
| committer | Nadav Rotem <nrotem@apple.com> | 2012-10-03 19:30:31 +0000 |
| commit | 2e7d38192de6ccdc54cf138fabdf00b81a6cd11d (patch) | |
| tree | 1665281885e90a2aa3f387795b40014507004378 /test | |
| parent | 436eaa88fda780e135405c9fc9dc9cac892eb9d8 (diff) | |
| download | external_llvm-2e7d38192de6ccdc54cf138fabdf00b81a6cd11d.zip external_llvm-2e7d38192de6ccdc54cf138fabdf00b81a6cd11d.tar.gz external_llvm-2e7d38192de6ccdc54cf138fabdf00b81a6cd11d.tar.bz2 | |
Fix a cycle in the DAG. In this code we replace multiple loads with a single load and
multiple stores with a single load. We create the wide loads and stores (and their chains)
before we remove the scalar loads and stores and fix the DAG chain. We attempted to merge
loads with a different chain. When that happened, the assumption that it is safe to RAUW
broke and a cycle was introduced.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165148 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/CodeGen/X86/2012-10-03-DAGCycle.ll | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2012-10-03-DAGCycle.ll b/test/CodeGen/X86/2012-10-03-DAGCycle.ll new file mode 100644 index 0000000..72083c7 --- /dev/null +++ b/test/CodeGen/X86/2012-10-03-DAGCycle.ll @@ -0,0 +1,31 @@ +; RUN: llc -mtriple=x86_64-apple-macosx -mcpu=corei7 < %s + +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" +target triple = "x86_64-apple-macosx10.8.0" + +%struct.pluto.0 = type { %struct.bar.1, %struct.hoge.368* } +%struct.bar.1 = type { %i8* } +%i8 = type { i8 } +%struct.hoge.368 = type { i32, i32 } +%struct.widget.375 = type { i32, i32, %i8*, %struct.hoge.368* } + +define fastcc void @bar(%struct.pluto.0* %arg) nounwind uwtable ssp align 2 { +bb: + %tmp1 = alloca %struct.widget.375, align 8 + %tmp2 = getelementptr inbounds %struct.pluto.0* %arg, i64 0, i32 1 + %tmp3 = load %struct.hoge.368** %tmp2, align 8 + store %struct.pluto.0* %arg, %struct.pluto.0** undef, align 8 + %tmp = getelementptr inbounds %struct.widget.375* %tmp1, i64 0, i32 2 + %tmp4 = getelementptr %struct.pluto.0* %arg, i64 0, i32 0, i32 0 + %tmp5 = load %i8** %tmp4, align 8 + store %i8* %tmp5, %i8** %tmp, align 8 + %tmp6 = getelementptr inbounds %struct.widget.375* %tmp1, i64 0, i32 3 + store %struct.hoge.368* %tmp3, %struct.hoge.368** %tmp6, align 8 + br i1 undef, label %bb8, label %bb7 + +bb7: ; preds = %bb + unreachable + +bb8: ; preds = %bb + unreachable +} |