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llvm-mirror/test/Transforms/FunctionAttrs/readattrs.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

48 lines
1.2 KiB
LLVM

; RUN: opt < %s -functionattrs -S | FileCheck %s
@x = global i32 0
declare void @test1_1(i8* %x1_1, i8* readonly %y1_1, ...)
; CHECK: define void @test1_2(i8* %x1_2, i8* readonly %y1_2, i8* %z1_2)
define void @test1_2(i8* %x1_2, i8* %y1_2, i8* %z1_2) {
call void (i8*, i8*, ...)* @test1_1(i8* %x1_2, i8* %y1_2, i8* %z1_2)
store i32 0, i32* @x
ret void
}
; CHECK: define i8* @test2(i8* readnone %p)
define i8* @test2(i8* %p) {
store i32 0, i32* @x
ret i8* %p
}
; CHECK: define i1 @test3(i8* readnone %p, i8* readnone %q)
define i1 @test3(i8* %p, i8* %q) {
%A = icmp ult i8* %p, %q
ret i1 %A
}
declare void @test4_1(i8* nocapture) readonly
; CHECK: define void @test4_2(i8* nocapture readonly %p)
define void @test4_2(i8* %p) {
call void @test4_1(i8* %p)
ret void
}
; CHECK: define void @test5(i8** nocapture %p, i8* %q)
; Missed optz'n: we could make %q readnone, but don't break test6!
define void @test5(i8** %p, i8* %q) {
store i8* %q, i8** %p
ret void
}
declare void @test6_1()
; CHECK: define void @test6_2(i8** nocapture %p, i8* %q)
; This is not a missed optz'n.
define void @test6_2(i8** %p, i8* %q) {
store i8* %q, i8** %p
call void @test6_1()
ret void
}