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Avoid store merge to f128 in context of noimpiccitfloat NFCI.

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Prevent store merge from merging stores into an invalid 128-bit store
(realized as a f128 value in the context of the noimplicitfloat
attribute). Previously, such stores are immediately split back into
valid stores.

llvm-svn: 308184
This commit is contained in:
Nirav Dave 2017-07-17 15:09:47 +00:00
parent 722ca4e706
commit 9af064f149
1 changed files with 13 additions and 0 deletions
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13
lib/Target/AArch64/AArch64ISelLowering.h
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@ -408,6 +408,19 @@ public:
bool isIntDivCheap(EVT VT, AttributeList Attr) const override;
bool canMergeStoresTo(unsigned AddressSpace, EVT MemVT,
const SelectionDAG &DAG) const override {
// Do not merge to float value size (128 bytes) if no implicit
// float attribute is set.
bool NoFloat = DAG.getMachineFunction().getFunction()->hasFnAttribute(
Attribute::NoImplicitFloat);
if (NoFloat)
return (MemVT.getSizeInBits() <= 64);
return true;
}
bool isCheapToSpeculateCttz() const override {
return true;
}