llvm-6502/test/Transforms/FunctionAttrs/2008-12-29-Constant.ll

; RUN: llvm-as < %s | opt -functionattrs | llvm-dis | grep readnone

@s = external constant i8		; <i8*> [#uses=1]

define i8 @f() {
	%tmp = load i8* @s		; <i8> [#uses=1]
	ret i8 %tmp
}
Rename AddReadAttrs to FunctionAttrs, and teach it how to work out (in a very simplistic way) which function arguments (pointer arguments only) are only dereferenced and so do not escape. Mark such arguments 'nocapture'. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61525 91177308-0d34-0410-b5e6-96231b3b80d8 2008-12-31 16:14:43 +00:00			`; RUN: llvm-as < %s \| opt -functionattrs \| llvm-dis \| grep readnone`
Allow readnone functions to read (and write!) global constants, since doing so is irrelevant for aliasing purposes. While this doesn't increase the total number of functions marked readonly or readnone in MultiSource/ Applications (3089), it does result in 12 functions being marked readnone rather than readonly. Before: readnone: 820 readonly: 2269 After: readnone: 832 readonly: 2257 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61469 91177308-0d34-0410-b5e6-96231b3b80d8 2008-12-29 11:34:09 +00:00
			`@s = external constant i8 ; <i8*> [#uses=1]`

			`define i8 @f() {`
			`%tmp = load i8* @s ; <i8> [#uses=1]`
			`ret i8 %tmp`
			`}`