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llvm-project/llvm/test/Transforms/FunctionAttrs/writeonly.ll
Nikita Popov 304f1d59ca [IR] Switch everything to use memory attribute 
This switches everything to use the memory attribute proposed in
https://discourse.llvm.org/t/rfc-unify-memory-effect-attributes/65579.
The old argmemonly, inaccessiblememonly and inaccessiblemem_or_argmemonly
attributes are dropped. The readnone, readonly and writeonly attributes
are restricted to parameters only.

The old attributes are auto-upgraded both in bitcode and IR.
The bitcode upgrade is a policy requirement that has to be retained
indefinitely. The IR upgrade is mainly there so it's not necessary
to update all tests using memory attributes in this patch, which
is already large enough. We could drop that part after migrating
tests, or retain it longer term, to make it easier to import IR
from older LLVM versions.

High-level Function/CallBase APIs like doesNotAccessMemory() or
setDoesNotAccessMemory() are mapped transparently to the memory
attribute. Code that directly manipulates attributes (e.g. via
AttributeList) on the other hand needs to switch to working with
the memory attribute instead.

Differential Revision: https://reviews.llvm.org/D135780
2022-11-04 10:21:38 +01:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --check-attributes
; RUN: opt < %s -passes=function-attrs -S | FileCheck %s
define void @nouses-argworn-funrn(ptr writeonly %.aaa) {
; CHECK: Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none)
; CHECK-LABEL: define {{[^@]+}}@nouses-argworn-funrn
; CHECK-SAME: (ptr nocapture readnone [[DOTAAA:%.*]]) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT: nouses-argworn-funrn_entry:
; CHECK-NEXT: ret void
;
nouses-argworn-funrn_entry:
ret void
}
define void @nouses-argworn-funro(ptr writeonly %.aaa, ptr %.bbb) {
; CHECK: Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read)
; CHECK-LABEL: define {{[^@]+}}@nouses-argworn-funro
; CHECK-SAME: (ptr nocapture readnone [[DOTAAA:%.*]], ptr nocapture readonly [[DOTBBB:%.*]]) #[[ATTR1:[0-9]+]] {
; CHECK-NEXT: nouses-argworn-funro_entry:
; CHECK-NEXT: [[VAL:%.*]] = load i32, ptr [[DOTBBB]], align 4
; CHECK-NEXT: ret void
;
nouses-argworn-funro_entry:
%val = load i32 , ptr %.bbb
ret void
}
%_type_of_d-ccc = type <{ ptr, i8, i8, i8, i8 }>
@d-ccc = internal global %_type_of_d-ccc <{ ptr null, i8 1, i8 13, i8 0, i8 -127 }>, align 8
define void @nouses-argworn-funwo(ptr writeonly %.aaa) {
; CHECK: Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(write, argmem: none, inaccessiblemem: none)
; CHECK-LABEL: define {{[^@]+}}@nouses-argworn-funwo
; CHECK-SAME: (ptr nocapture readnone [[DOTAAA:%.*]]) #[[ATTR2:[0-9]+]] {
; CHECK-NEXT: nouses-argworn-funwo_entry:
; CHECK-NEXT: store i8 0, ptr getelementptr inbounds ([[_TYPE_OF_D_CCC:%.*]], ptr @d-ccc, i32 0, i32 3), align 1
; CHECK-NEXT: ret void
;
nouses-argworn-funwo_entry:
store i8 0, ptr getelementptr inbounds (%_type_of_d-ccc, ptr @d-ccc, i32 0, i32 3)
ret void
}
define void @test_store(ptr %p) {
; CHECK: Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: write)
; CHECK-LABEL: define {{[^@]+}}@test_store
; CHECK-SAME: (ptr nocapture writeonly [[P:%.*]]) #[[ATTR3:[0-9]+]] {
; CHECK-NEXT: store i8 0, ptr [[P]], align 1
; CHECK-NEXT: ret void
;
store i8 0, ptr %p
ret void
}
@G = external global ptr
define i8 @test_store_capture(ptr %p) {
; CHECK: Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, argmem: read, inaccessiblemem: none)
; CHECK-LABEL: define {{[^@]+}}@test_store_capture
; CHECK-SAME: (ptr [[P:%.*]]) #[[ATTR4:[0-9]+]] {
; CHECK-NEXT: store ptr [[P]], ptr @G, align 8
; CHECK-NEXT: [[P2:%.*]] = load ptr, ptr @G, align 8
; CHECK-NEXT: [[V:%.*]] = load i8, ptr [[P2]], align 1
; CHECK-NEXT: ret i8 [[V]]
;
store ptr %p, ptr @G
%p2 = load ptr, ptr @G
%v = load i8, ptr %p2
ret i8 %v
}
define void @test_addressing(ptr %p) {
; CHECK: Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: write)
; CHECK-LABEL: define {{[^@]+}}@test_addressing
; CHECK-SAME: (ptr nocapture writeonly [[P:%.*]]) #[[ATTR3]] {
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, ptr [[P]], i64 8
; CHECK-NEXT: store i32 0, ptr [[GEP]], align 4
; CHECK-NEXT: ret void
;
%gep = getelementptr i8, ptr %p, i64 8
store i32 0, ptr %gep
ret void
}
define void @test_readwrite(ptr %p) {
; CHECK: Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: readwrite)
; CHECK-LABEL: define {{[^@]+}}@test_readwrite
; CHECK-SAME: (ptr nocapture [[P:%.*]]) #[[ATTR5:[0-9]+]] {
; CHECK-NEXT: [[V:%.*]] = load i8, ptr [[P]], align 1
; CHECK-NEXT: store i8 [[V]], ptr [[P]], align 1
; CHECK-NEXT: ret void
;
%v = load i8, ptr %p
store i8 %v, ptr %p
ret void
}
define void @test_volatile(ptr %p) {
; CHECK: Function Attrs: nofree norecurse nounwind memory(argmem: readwrite, inaccessiblemem: readwrite)
; CHECK-LABEL: define {{[^@]+}}@test_volatile
; CHECK-SAME: (ptr [[P:%.*]]) #[[ATTR6:[0-9]+]] {
; CHECK-NEXT: store volatile i8 0, ptr [[P]], align 1
; CHECK-NEXT: ret void
;
store volatile i8 0, ptr %p
ret void
}
define void @test_atomicrmw(ptr %p) {
; CHECK: Function Attrs: mustprogress nofree norecurse nounwind willreturn memory(argmem: readwrite)
; CHECK-LABEL: define {{[^@]+}}@test_atomicrmw
; CHECK-SAME: (ptr nocapture [[P:%.*]]) #[[ATTR7:[0-9]+]] {
; CHECK-NEXT: [[TMP1:%.*]] = atomicrmw add ptr [[P]], i8 0 seq_cst, align 1
; CHECK-NEXT: ret void
;
atomicrmw add ptr %p, i8 0 seq_cst
ret void
}
declare void @direct1_callee(ptr %p)
define void @direct1(ptr %p) {
; CHECK-LABEL: define {{[^@]+}}@direct1
; CHECK-SAME: (ptr [[P:%.*]]) {
; CHECK-NEXT: call void @direct1_callee(ptr [[P]])
; CHECK-NEXT: ret void
;
call void @direct1_callee(ptr %p)
ret void
}
declare void @direct2_callee(ptr %p) writeonly
; writeonly w/o nocapture is not enough
define void @direct2(ptr %p) {
; CHECK: Function Attrs: memory(write)
; CHECK-LABEL: define {{[^@]+}}@direct2
; CHECK-SAME: (ptr [[P:%.*]]) #[[ATTR8:[0-9]+]] {
; CHECK-NEXT: call void @direct2_callee(ptr [[P]])
; CHECK-NEXT: ret void
;
call void @direct2_callee(ptr %p)
; read back from global, read through pointer...
ret void
}
define void @direct2b(ptr %p) {
; CHECK: Function Attrs: memory(write)
; CHECK-LABEL: define {{[^@]+}}@direct2b
; CHECK-SAME: (ptr nocapture [[P:%.*]]) #[[ATTR8]] {
; CHECK-NEXT: call void @direct2_callee(ptr nocapture [[P]])
; CHECK-NEXT: ret void
;
call void @direct2_callee(ptr nocapture %p)
ret void
}
declare void @direct3_callee(ptr nocapture writeonly %p)
define void @direct3(ptr %p) {
; CHECK-LABEL: define {{[^@]+}}@direct3
; CHECK-SAME: (ptr nocapture writeonly [[P:%.*]]) {
; CHECK-NEXT: call void @direct3_callee(ptr [[P]])
; CHECK-NEXT: ret void
;
call void @direct3_callee(ptr %p)
ret void
}
define void @direct3b(ptr %p) {
; CHECK-LABEL: define {{[^@]+}}@direct3b
; CHECK-SAME: (ptr [[P:%.*]]) {
; CHECK-NEXT: call void @direct3_callee(ptr [[P]]) [ "may-read-and-capture"(ptr [[P]]) ]
; CHECK-NEXT: ret void
;
call void @direct3_callee(ptr %p) ["may-read-and-capture"(ptr %p)]
ret void
}
define void @direct3c(ptr %p) {
; CHECK-LABEL: define {{[^@]+}}@direct3c
; CHECK-SAME: (ptr nocapture [[P:%.*]]) {
; CHECK-NEXT: call void @direct3_callee(ptr [[P]]) [ "may-read"() ]
; CHECK-NEXT: ret void
;
call void @direct3_callee(ptr %p) ["may-read"()]
ret void
}
define void @fptr_test1(ptr %p, ptr %f) {
; CHECK-LABEL: define {{[^@]+}}@fptr_test1
; CHECK-SAME: (ptr [[P:%.*]], ptr nocapture readonly [[F:%.*]]) {
; CHECK-NEXT: call void [[F]](ptr [[P]])
; CHECK-NEXT: ret void
;
call void %f(ptr %p)
ret void
}
define void @fptr_test2(ptr %p, ptr %f) {
; CHECK-LABEL: define {{[^@]+}}@fptr_test2
; CHECK-SAME: (ptr nocapture writeonly [[P:%.*]], ptr nocapture readonly [[F:%.*]]) {
; CHECK-NEXT: call void [[F]](ptr nocapture writeonly [[P]])
; CHECK-NEXT: ret void
;
call void %f(ptr nocapture writeonly %p)
ret void
}
define void @fptr_test3(ptr %p, ptr %f) {
; CHECK: Function Attrs: memory(write)
; CHECK-LABEL: define {{[^@]+}}@fptr_test3
; CHECK-SAME: (ptr nocapture [[P:%.*]], ptr nocapture readonly [[F:%.*]]) #[[ATTR8]] {
; CHECK-NEXT: call void [[F]](ptr nocapture [[P]]) #[[ATTR8]]
; CHECK-NEXT: ret void
;
call void %f(ptr nocapture %p) writeonly
ret void
}
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