[LLVMdev] @llvm.memset.* documentation

Chris Lattner clattner at apple.com
Sat Feb 27 09:51:10 PST 2010

On Feb 27, 2010, at 12:53 AM, Jean-Paul Kogelman wrote:

> Hi everyone,
> I was looking at the @llvm.memset.* documentation and something seemed a bit off. The <len> argument type seems wrong. It's the same as the <val> type, but it would seem to me that only being able to memset 255 bytes in an i8 array is a bit limiting. :)
It is right, the size isn't tied to the value.  The value is always i8, the size can be any integer type:


> declare void @llvm.memset.i8(i8 * <dest>, i8 <val>, i8 <len>, i32 <align>)
> declare void @llvm.memset.i16(i8 * <dest>, i8 <val>, i16 <len>, i32 <align>)
> declare void @llvm.memset.i32(i8 * <dest>, i8 <val>, i32 <len>, i32 <align>)
> declare void @llvm.memset.i64(i8 * <dest>, i8 <val>, i64 <len>, i32 <align>)
> It takes i32 for <len> just fine btw.
> Cheers,
> Jean-Paul Kogelman
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