[llvm-commits] [llvm] r169111 - in /llvm/trunk: lib/CodeGen/SelectionDAG/DAGCombiner.cpp test/CodeGen/X86/2012-12-1-merge-multiple.ll
Nadav Rotem
nrotem at apple.com
Sun Dec 2 09:14:10 PST 2012
Author: nadav
Date: Sun Dec 2 11:14:09 2012
New Revision: 169111
URL: http://llvm.org/viewvc/llvm-project?rev=169111&view=rev
Log:
Allow merging multiple store sequences on the same chain.
Added:
llvm/trunk/test/CodeGen/X86/2012-12-1-merge-multiple.ll
Modified:
llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
Modified: llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp?rev=169111&r1=169110&r2=169111&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Sun Dec 2 11:14:09 2012
@@ -8157,8 +8157,21 @@
// Only perform this optimization before the types are legal, because we
// don't want to perform this optimization on every DAGCombine invocation.
- if (!LegalTypes && MergeConsecutiveStores(ST))
- return SDValue(N, 0);
+ if (!LegalTypes) {
+ bool EverChanged = false;
+
+ do {
+ // There can be multiple store sequences on the same chain.
+ // Keep trying to merge store sequences until we are unable to do so
+ // or until we merge the last store on the chain.
+ bool Changed = MergeConsecutiveStores(ST);
+ EverChanged |= Changed;
+ if (!Changed) break;
+ } while (ST->getOpcode() != ISD::DELETED_NODE);
+
+ if (EverChanged)
+ return SDValue(N, 0);
+ }
return ReduceLoadOpStoreWidth(N);
}
Added: llvm/trunk/test/CodeGen/X86/2012-12-1-merge-multiple.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/2012-12-1-merge-multiple.ll?rev=169111&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/X86/2012-12-1-merge-multiple.ll (added)
+++ llvm/trunk/test/CodeGen/X86/2012-12-1-merge-multiple.ll Sun Dec 2 11:14:09 2012
@@ -0,0 +1,31 @@
+; RUN: llc < %s -march=x86-64 -mcpu=corei7 -mtriple=x86_64-pc-win64 | FileCheck %s
+
+; CHECK: multiple_stores_on_chain
+; CHECK: movabsq
+; CHECK: movq
+; CHECK: movabsq
+; CHECK: movq
+; CHECK: ret
+define void @multiple_stores_on_chain(i16 * %A) {
+entry:
+ %a0 = getelementptr inbounds i16* %A, i64 0
+ %a1 = getelementptr inbounds i16* %A, i64 1
+ %a2 = getelementptr inbounds i16* %A, i64 2
+ %a3 = getelementptr inbounds i16* %A, i64 3
+ %a4 = getelementptr inbounds i16* %A, i64 4
+ %a5 = getelementptr inbounds i16* %A, i64 5
+ %a6 = getelementptr inbounds i16* %A, i64 6
+ %a7 = getelementptr inbounds i16* %A, i64 7
+
+ store i16 0, i16* %a0
+ store i16 1, i16* %a1
+ store i16 2, i16* %a2
+ store i16 3, i16* %a3
+ store i16 4, i16* %a4
+ store i16 5, i16* %a5
+ store i16 6, i16* %a6
+ store i16 7, i16* %a7
+
+ ret void
+}
+
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