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[InstCombine] Don't unpack arrays that are too large (part 2).

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This is similar to r283599, but for store instructions.
Thanks to David for pointing out!

llvm-svn: 283612
This commit is contained in:
Davide Italiano 2016-10-07 21:53:09 +00:00
parent fba0249962
commit 99e8d201a0
2 changed files with 16 additions and 0 deletions
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7
lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
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@ -1095,6 +1095,13 @@ static bool unpackStoreToAggregate(InstCombiner &IC, StoreInst &SI) {
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();

9
test/Transforms/InstCombine/unpack-fca.ll
View File

@ -49,6 +49,15 @@ define void @storeArrayOfA([1 x %A]* %aa.ptr) {
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