[llvm-dev] Masked intrinsics and non-default address spaces
Mehdi Amini via llvm-dev
llvm-dev at lists.llvm.org
Mon Feb 15 12:55:30 PST 2016
> On Feb 15, 2016, at 11:34 AM, Artur Pilipenko via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> Masked load/store are overloaded intrinsics, the only generic type is the type of the value being loaded/stored. The signature of the intrinsic is generated based on this type. The type of the pointer argument is generated as a pointer to the return type with default addrspace. E.g.:
> declare <8 x i32> @llvm.masked.load.v8i32(<8 x i32>*, i32, <8 x i1>, <8 x i32>)
How would the "typeless" pointer interact with this? Would the problem be solved?
> The problem occurs when loop-vectorize tries to use @llvm.masked.load/store intrinsic for a non-default addrspace pointer. It fails with "Calling a function with a bad signature!" assertion in CallInst constructor because it tries to pass a non-default addrspace pointer to the pointer argument which has default addrspace.
> My proposal to fix the problem is to add another overloaded type parameter for the intrinsics - the pointer type, which can be any pointer with underlying type being a data type. In this case the signature of the intrinsic above would be:
> declare <8 x i32> @llvm.masked.load.v8i32.p1v8i32(<8 x i32> addrspace(1)*, i32, <8 x i1>, <8 x i32>)
> Corresponding patch is posted on phabricator: http://reviews.llvm.org/D17270 <http://reviews.llvm.org/D17270>
> Any comments, objections or alternatives?
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