llvm-6502/test/Transforms/AddReadAttrs/2008-09-13-VolatileRead.ll

; RUN: llvm-as < %s | opt -addreadattrs | llvm-dis | not grep read
; PR2792

@g = global i32 0		; <i32*> [#uses=1]

define i32 @f() {
	%t = volatile load i32* @g		; <i32> [#uses=1]
	ret i32 %t
}
Add a new pass AddReadAttrs which works out which functions can get the readnone/readonly attributes, and gives them it. The plan is to remove markmodref (which did the same thing by querying GlobalsModRef) and delete the analogous functionality from GlobalsModRef. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56341 91177308-0d34-0410-b5e6-96231b3b80d8 2008-09-19 08:17:05 +00:00			`; RUN: llvm-as < %s \| opt -addreadattrs \| llvm-dis \| not grep read`
Fix PR2792: treat volatile loads as writing memory somewhere. Treat stores as reading memory, just to play safe. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56188 91177308-0d34-0410-b5e6-96231b3b80d8 2008-09-13 12:45:50 +00:00			`; PR2792`

			`@g = global i32 0 ; <i32*> [#uses=1]`

			`define i32 @f() {`
			`%t = volatile load i32* @g ; <i32> [#uses=1]`
			`ret i32 %t`
			`}`