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r283612 | davide | 2016-10-07 14:53:09 -0700 (Fri, 07 Oct 2016) | 5 lines
[InstCombine] Don't unpack arrays that are too large (part 2).
This is similar to r283599, but for store instructions.
Thanks to David for pointing out!
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_39@288070
91177308-0d34-0410-b5e6-
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return true;
}
+ // 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 false;
+
const DataLayout &DL = IC.getDataLayout();
auto EltSize = DL.getTypeAllocSize(AT->getElementType());
auto Align = SI.getAlignment();
ret void
}
+define void @storeLargeArrayOfA([2000 x %A]* %aa.ptr) {
+; CHECK-LABEL: storeLargeArrayOfA
+; CHECK-NEXT: store [2000 x %A]
+; CHECK-NEXT: ret void
+ %i1 = insertvalue [2000 x %A] undef, %A { %A__vtbl* @A__vtblZ }, 1
+ store [2000 x %A] %i1, [2000 x %A]* %aa.ptr, align 8
+ ret void
+}
+
define void @storeStructOfArrayOfA({ [1 x %A] }* %saa.ptr) {
; CHECK-LABEL: storeStructOfArrayOfA
; CHECK-NEXT: [[GEP:%[a-z0-9\.]+]] = getelementptr inbounds { [1 x %A] }, { [1 x %A] }* %saa.ptr, i64 0, i32 0, i64 0, i32 0