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; RUN: opt < %s -function-attrs -S | FileCheck %s
; RUN: opt < %s -aa-pipeline=basic-aa -passes='cgscc(function-attrs)' -S | FileCheck %s
@x = global i32 0
declare void @test1_1(i8* %x1_1, i8* nocapture readonly %y1_1, ...)
; CHECK: define void @test1_2(i8* %x1_2, i8* nocapture 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 returned %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 writeonly %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 writeonly %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
}
; CHECK: define void @test7_1(i32* nocapture inalloca(i32) %a)
; inalloca parameters are always considered written
define void @test7_1(i32* inalloca(i32) %a) {
ret void
}
; CHECK: define void @test7_2(i32* nocapture preallocated(i32) %a)
; preallocated parameters are always considered written
define void @test7_2(i32* preallocated(i32) %a) {
ret void
}
; CHECK: define i32* @test8_1(i32* readnone returned %p)
define i32* @test8_1(i32* %p) {
entry:
ret i32* %p
}
; CHECK: define void @test8_2(i32* writeonly %p)
define void @test8_2(i32* %p) {
entry:
%call = call i32* @test8_1(i32* %p)
store i32 10, i32* %call, align 4
ret void
}
; CHECK: declare void @llvm.masked.scatter
declare void @llvm.masked.scatter.v4i32.v4p0i32(<4 x i32>%val, <4 x i32*>, i32, <4 x i1>)
; CHECK-NOT: readnone
; CHECK-NOT: readonly
; CHECK: define void @test9
define void @test9(<4 x i32*> %ptrs, <4 x i32>%val) {
call void @llvm.masked.scatter.v4i32.v4p0i32(<4 x i32>%val, <4 x i32*> %ptrs, i32 4, <4 x i1><i1 true, i1 false, i1 true, i1 false>)
ret void
}
; CHECK: declare <4 x i32> @llvm.masked.gather
declare <4 x i32> @llvm.masked.gather.v4i32.v4p0i32(<4 x i32*>, i32, <4 x i1>, <4 x i32>)
; CHECK: readonly
; CHECK: define <4 x i32> @test10
define <4 x i32> @test10(<4 x i32*> %ptrs) {
%res = call <4 x i32> @llvm.masked.gather.v4i32.v4p0i32(<4 x i32*> %ptrs, i32 4, <4 x i1><i1 true, i1 false, i1 true, i1 false>, <4 x i32>undef)
ret <4 x i32> %res
}
; CHECK: declare <4 x i32> @test11_1
declare <4 x i32> @test11_1(<4 x i32*>) argmemonly nounwind readonly
; CHECK: readonly
; CHECK-NOT: readnone
; CHECK: define <4 x i32> @test11_2
define <4 x i32> @test11_2(<4 x i32*> %ptrs) {
%res = call <4 x i32> @test11_1(<4 x i32*> %ptrs)
ret <4 x i32> %res
}
declare <4 x i32> @test12_1(<4 x i32*>) argmemonly nounwind
; CHECK-NOT: readnone
; CHECK: define <4 x i32> @test12_2
define <4 x i32> @test12_2(<4 x i32*> %ptrs) {
%res = call <4 x i32> @test12_1(<4 x i32*> %ptrs)
ret <4 x i32> %res
}
; CHECK: define i32 @volatile_load(
; CHECK-NOT: readonly
; CHECK: ret
define i32 @volatile_load(i32* %p) {
%load = load volatile i32, i32* %p
ret i32 %load
}
declare void @escape_readnone_ptr(i8** %addr, i8* readnone %ptr)
declare void @escape_readonly_ptr(i8** %addr, i8* readonly %ptr)
; The argument pointer %escaped_then_written cannot be marked readnone/only even
; though the only direct use, in @escape_readnone_ptr/@escape_readonly_ptr,
; is marked as readnone/only. However, the functions can write the pointer into
; %addr, causing the store to write to %escaped_then_written.
;
; CHECK: define void @unsound_readnone(i8* nocapture readnone %ignored, i8* %escaped_then_written)
; CHECK: define void @unsound_readonly(i8* nocapture readnone %ignored, i8* %escaped_then_written)
;
define void @unsound_readnone(i8* %ignored, i8* %escaped_then_written) {
%addr = alloca i8*
call void @escape_readnone_ptr(i8** %addr, i8* %escaped_then_written)
%addr.ld = load i8*, i8** %addr
store i8 0, i8* %addr.ld
ret void
}
define void @unsound_readonly(i8* %ignored, i8* %escaped_then_written) {
%addr = alloca i8*
call void @escape_readonly_ptr(i8** %addr, i8* %escaped_then_written)
%addr.ld = load i8*, i8** %addr
store i8 0, i8* %addr.ld
ret void
}
; CHECK: define void @fptr_test1a(i8* nocapture readnone %p, void (i8*)* nocapture readonly %f)
define void @fptr_test1a(i8* %p, void (i8*)* %f) {
call void %f(i8* nocapture readnone %p)
ret void
}
; CHECK: define void @fptr_test1b(i8* %p, void (i8*)* nocapture readonly %f)
define void @fptr_test1b(i8* %p, void (i8*)* %f) {
; Can't infer readnone here because call might capture %p
call void %f(i8* readnone %p)
ret void
}
; CHECK: define void @fptr_test1c(i8* readnone %p, void (i8*)* nocapture readonly %f)
define void @fptr_test1c(i8* %p, void (i8*)* %f) {
call void %f(i8* readnone %p) readonly
ret void
}
; CHECK: define void @fptr_test2a(i8* nocapture readonly %p, void (i8*)* nocapture readonly %f)
define void @fptr_test2a(i8* %p, void (i8*)* %f) {
call void %f(i8* nocapture readonly %p)
ret void
}
; CHECK: define void @fptr_test2b(i8* %p, void (i8*)* nocapture readonly %f)
define void @fptr_test2b(i8* %p, void (i8*)* %f) {
; Can't infer readonly here because call might capture %p
call void %f(i8* readonly %p)
ret void
}
; CHECK: define void @fptr_test2c(i8* readonly %p, void (i8*)* nocapture readonly %f)
define void @fptr_test2c(i8* %p, void (i8*)* %f) {
call void %f(i8* readonly %p) readonly
ret void
}
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