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llvm-mirror/test/Transforms/FunctionAttrs/atomic.ll
Nick Lewycky 7b093a1c2f Extend 'readonly' and 'readnone' to work on function arguments as well as
functions. Make the function attributes pass add it to known library functions
and when it can deduce it.

llvm-svn: 185735
2013-07-06 00:29:58 +00:00

24 lines
693 B
LLVM

; RUN: opt -basicaa -functionattrs -S < %s | FileCheck %s
; Atomic load/store to local doesn't affect whether a function is
; readnone/readonly.
define i32 @test1(i32 %x) uwtable ssp {
; CHECK: define i32 @test1(i32 %x) #0 {
entry:
%x.addr = alloca i32, align 4
store atomic i32 %x, i32* %x.addr seq_cst, align 4
%r = load atomic i32* %x.addr seq_cst, align 4
ret i32 %r
}
; A function with an Acquire load is not readonly.
define i32 @test2(i32* %x) uwtable ssp {
; CHECK: define i32 @test2(i32* nocapture readonly %x) #1 {
entry:
%r = load atomic i32* %x seq_cst, align 4
ret i32 %r
}
; CHECK: attributes #0 = { readnone ssp uwtable }
; CHECK: attributes #1 = { ssp uwtable }