llvm dev - Dec 2017 - Query on i128 type tests written for memset

Hi,

I was going through tests written for memset. I need help in figuring out the
types in the tests.
Found test
"test/Transforms/MemCpyOpt/memset-memcpy-redundant-memset.ll>"
which uses i128 type for destination size.
I am curious when we can get i128 type dest_size calls for memset?

<snip>
define void @test_different_types_i128_i32(i8* %dst, i8* %src, i128 %dst_size,
i32 %src_size, i8 %c) {
  call void @llvm.memset.p0i8.i128(i8* %dst, i8 %c, i128 %dst_size, i32 1, i1
false)
  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %src, i32 %src_size, i32 1,
i1 false)
  ret void
}
</snip>

Regards
-Ganesh

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On 12/20/2017 9:51 PM, Gopalasubramanian, Ganesh via llvm-dev
wrote:
>
> Hi,
>
> I was going through tests written for memset. I need help in figuring 
> out the types in the tests.
> Found test 
> “test/Transforms/MemCpyOpt/memset-memcpy-redundant-memset.ll>” which 
> uses i128 type for destination size.
>
> I am curious when we can get i128 type dest_size calls for memset?
>
As far as I know, clang will never generate a memset like that, and LLVM 
optimizations won't either.  But there isn't any rule against it, so 
other frontends could generate one, at least in theory.

-Eli

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux
Foundation Collaborative Project

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