Merging r283599:

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r283599 | davide | 2016-10-07 13:57:42 -0700 (Fri, 07 Oct 2016) | 4 lines

[InstCombine] Don't unpack arrays that are too large

Differential Revision:  https://reviews.llvm.org/D25376

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_39@288069 91177308-0d34-0410-b5e6-96231b3b80d8

Author: tstellarAMD

lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp

@@ -579,6 +579,13 @@ static Instruction *unpackLoadToAggregate(InstCombiner &IC, LoadInst &LI) {
         UndefValue::get(T), NewLoad, 0, Name));
     }
 
+    // Bail out if the array is too large. Ideally we would like to optimize
+    // arrays of arbitrary size but this has a terrible impact on compile time.
+    // The threshold here is chosen arbitrarily, maybe needs a little bit of
+    // tuning.
+    if (NumElements > 1024)
+      return nullptr;
+
     const DataLayout &DL = IC.getDataLayout();
     auto EltSize = DL.getTypeAllocSize(ET);
     auto Align = LI.getAlignment();

test/Transforms/InstCombine/unpack-fca.ll

@@ -179,6 +179,14 @@ define [2 x %B] @loadArrayOfB([2 x %B]* %ab.ptr) {
   ret [2 x %B] %1
 }
 
+define [2000 x %B] @loadLargeArrayOfB([2000 x %B]* %ab.ptr) {
+; CHECK-LABEL: loadLargeArrayOfB
+; CHECK-NEXT: load [2000 x %B], [2000 x %B]* %ab.ptr, align 8
+; CHECK-NEXT: ret [2000 x %B]
+  %1 = load [2000 x %B], [2000 x %B]* %ab.ptr, align 8
+  ret [2000 x %B] %1
+}
+
 %struct.S = type <{ i8, %struct.T }>
 %struct.T = type { i32, i32 }