llvm dev - Feb 2010 - [LLVMdev] @llvm.memset.* documentation

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. :)

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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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:
http://llvm.org/docs/LangRef.html#int_memset

-Chris
> 
> 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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