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llvm-mirror/test/Transforms/Inline/ret_attr_update.ll
Nikita Popov a78d45f1a3 [ValueTracking] Don't assume readonly function will return 
This is similar to D94106, but for the
isGuaranteedToTransferExecutionToSuccessor() helper. We should not
assume that readonly functions will return, as this is only true for
mustprogress functions (in which case we already infer willreturn).
As with the DCE change, for now continue assuming that readonly
intrinsics will return, as not all target intrinsics have been
annotated yet.

Differential Revision: https://reviews.llvm.org/D95288
2021-01-24 10:40:21 +01:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -inline-threshold=0 -always-inline -S | FileCheck %s
; RUN: opt < %s -passes=always-inline -S | FileCheck %s
declare i8* @foo(i8*) nounwind willreturn
define i8* @callee(i8 *%p) alwaysinline {
; CHECK-LABEL: @callee(
; CHECK-NEXT: [[R:%.*]] = call i8* @foo(i8* noalias [[P:%.*]])
; CHECK-NEXT: ret i8* [[R]]
;
%r = call i8* @foo(i8* noalias %p)
ret i8* %r
}
define i8* @caller(i8* %ptr, i64 %x) {
; CHECK-LABEL: @caller(
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, i8* [[PTR:%.*]], i64 [[X:%.*]]
; CHECK-NEXT: [[R_I:%.*]] = call nonnull i8* @foo(i8* noalias [[GEP]])
; CHECK-NEXT: ret i8* [[R_I]]
;
%gep = getelementptr inbounds i8, i8* %ptr, i64 %x
%p = call nonnull i8* @callee(i8* %gep)
ret i8* %p
}
declare void @llvm.experimental.guard(i1,...)
; Cannot add nonnull attribute to foo
; because the guard is a throwing call
define internal i8* @callee_with_throwable(i8* %p) alwaysinline {
%r = call i8* @foo(i8* %p)
%cond = icmp ne i8* %r, null
call void (i1, ...) @llvm.experimental.guard(i1 %cond) [ "deopt"() ]
ret i8* %r
}
declare i8* @bar(i8*) readonly nounwind
; Here also we cannot add nonnull attribute to the call bar.
define internal i8* @callee_with_explicit_control_flow(i8* %p) alwaysinline {
%r = call i8* @bar(i8* %p)
%cond = icmp ne i8* %r, null
br i1 %cond, label %ret, label %orig
ret:
ret i8* %r
orig:
ret i8* %p
}
define i8* @caller2(i8* %ptr, i64 %x, i1 %cond) {
; CHECK-LABEL: @caller2(
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, i8* [[PTR:%.*]], i64 [[X:%.*]]
; CHECK-NEXT: [[R_I:%.*]] = call i8* @foo(i8* [[GEP]])
; CHECK-NEXT: [[COND_I:%.*]] = icmp ne i8* [[R_I]], null
; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[COND_I]]) [ "deopt"() ]
; CHECK-NEXT: [[R_I1:%.*]] = call i8* @bar(i8* [[GEP]])
; CHECK-NEXT: [[COND_I2:%.*]] = icmp ne i8* [[R_I1]], null
; CHECK-NEXT: br i1 [[COND_I2]], label [[RET_I:%.*]], label [[ORIG_I:%.*]]
; CHECK: ret.i:
; CHECK-NEXT: br label [[CALLEE_WITH_EXPLICIT_CONTROL_FLOW_EXIT:%.*]]
; CHECK: orig.i:
; CHECK-NEXT: br label [[CALLEE_WITH_EXPLICIT_CONTROL_FLOW_EXIT]]
; CHECK: callee_with_explicit_control_flow.exit:
; CHECK-NEXT: [[Q3:%.*]] = phi i8* [ [[R_I1]], [[RET_I]] ], [ [[GEP]], [[ORIG_I]] ]
; CHECK-NEXT: br i1 [[COND:%.*]], label [[PRET:%.*]], label [[QRET:%.*]]
; CHECK: pret:
; CHECK-NEXT: ret i8* [[R_I]]
; CHECK: qret:
; CHECK-NEXT: ret i8* [[Q3]]
;
%gep = getelementptr inbounds i8, i8* %ptr, i64 %x
%p = call nonnull i8* @callee_with_throwable(i8* %gep)
%q = call nonnull i8* @callee_with_explicit_control_flow(i8* %gep)
br i1 %cond, label %pret, label %qret
pret:
ret i8* %p
qret:
ret i8* %q
}
define internal i8* @callee3(i8 *%p) alwaysinline {
%r = call noalias i8* @foo(i8* %p)
ret i8* %r
}
; add the deref attribute to the existing attributes on foo.
define i8* @caller3(i8* %ptr, i64 %x) {
; CHECK-LABEL: @caller3(
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, i8* [[PTR:%.*]], i64 [[X:%.*]]
; CHECK-NEXT: [[R_I:%.*]] = call noalias dereferenceable_or_null(12) i8* @foo(i8* [[GEP]])
; CHECK-NEXT: ret i8* [[R_I]]
;
%gep = getelementptr inbounds i8, i8* %ptr, i64 %x
%p = call dereferenceable_or_null(12) i8* @callee3(i8* %gep)
ret i8* %p
}
declare i8* @inf_loop_call(i8*) nounwind
; We cannot propagate attributes to foo because we do not know whether inf_loop_call
; will return execution.
define internal i8* @callee_with_sideeffect_callsite(i8* %p) alwaysinline {
%r = call i8* @foo(i8* %p)
%v = call i8* @inf_loop_call(i8* %p)
ret i8* %r
}
; do not add deref attribute to foo
define i8* @test4(i8* %ptr, i64 %x) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, i8* [[PTR:%.*]], i64 [[X:%.*]]
; CHECK-NEXT: [[R_I:%.*]] = call i8* @foo(i8* [[GEP]])
; CHECK-NEXT: [[V_I:%.*]] = call i8* @inf_loop_call(i8* [[GEP]])
; CHECK-NEXT: ret i8* [[R_I]]
;
%gep = getelementptr inbounds i8, i8* %ptr, i64 %x
%p = call dereferenceable_or_null(12) i8* @callee_with_sideeffect_callsite(i8* %gep)
ret i8* %p
}
declare i8* @baz(i8*) nounwind willreturn
define internal i8* @callee5(i8* %p) alwaysinline {
%r = call i8* @foo(i8* %p)
%v = call i8* @baz(i8* %p)
ret i8* %r
}
; add the deref attribute to foo.
define i8* @test5(i8* %ptr, i64 %x) {
; CHECK-LABEL: @test5(
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, i8* [[PTR:%.*]], i64 [[X:%.*]]
; CHECK-NEXT: [[R_I:%.*]] = call dereferenceable_or_null(12) i8* @foo(i8* [[GEP]])
; CHECK-NEXT: [[V_I:%.*]] = call i8* @baz(i8* [[GEP]])
; CHECK-NEXT: ret i8* [[R_I]]
;
%gep = getelementptr inbounds i8, i8* %ptr, i64 %x
%s = call dereferenceable_or_null(12) i8* @callee5(i8* %gep)
ret i8* %s
}
; deref attributes have different values on the callee and the call feeding into
; the return.
; AttrBuilder chooses the already existing value and does not overwrite it.
define internal i8* @callee6(i8* %p) alwaysinline {
%r = call dereferenceable_or_null(16) i8* @foo(i8* %p)
%v = call i8* @baz(i8* %p)
ret i8* %r
}
define i8* @test6(i8* %ptr, i64 %x) {
; CHECK-LABEL: @test6(
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, i8* [[PTR:%.*]], i64 [[X:%.*]]
; CHECK-NEXT: [[R_I:%.*]] = call dereferenceable_or_null(16) i8* @foo(i8* [[GEP]])
; CHECK-NEXT: [[V_I:%.*]] = call i8* @baz(i8* [[GEP]])
; CHECK-NEXT: ret i8* [[R_I]]
;
%gep = getelementptr inbounds i8, i8* %ptr, i64 %x
%s = call dereferenceable_or_null(12) i8* @callee6(i8* %gep)
ret i8* %s
}
; We add the attributes from the callee to both the calls below.
define internal i8* @callee7(i8 *%ptr, i1 %cond) alwaysinline {
br i1 %cond, label %pass, label %fail
pass:
%r = call i8* @foo(i8* noalias %ptr)
ret i8* %r
fail:
%s = call i8* @baz(i8* %ptr)
ret i8* %s
}
define void @test7(i8* %ptr, i64 %x, i1 %cond) {
; CHECK-LABEL: @test7(
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, i8* [[PTR:%.*]], i64 [[X:%.*]]
; CHECK-NEXT: br i1 [[COND:%.*]], label [[PASS_I:%.*]], label [[FAIL_I:%.*]]
; CHECK: pass.i:
; CHECK-NEXT: [[R_I:%.*]] = call nonnull i8* @foo(i8* noalias [[GEP]])
; CHECK-NEXT: br label [[CALLEE7_EXIT:%.*]]
; CHECK: fail.i:
; CHECK-NEXT: [[S_I:%.*]] = call nonnull i8* @baz(i8* [[GEP]])
; CHECK-NEXT: br label [[CALLEE7_EXIT]]
; CHECK: callee7.exit:
; CHECK-NEXT: [[T1:%.*]] = phi i8* [ [[R_I]], [[PASS_I]] ], [ [[S_I]], [[FAIL_I]] ]
; CHECK-NEXT: call void @snort(i8* [[T1]])
; CHECK-NEXT: ret void
;
%gep = getelementptr inbounds i8, i8* %ptr, i64 %x
%t = call nonnull i8* @callee7(i8* %gep, i1 %cond)
call void @snort(i8* %t)
ret void
}
declare void @snort(i8*)
declare i32 @intrinsic(i8*) nounwind argmemonly
define internal i32 @callee8(i8* %ptr) alwaysinline {
%r = call i32 @intrinsic(i8* noalias %ptr)
ret i32 %r
}
; signext is an attribute specific to the target ABI and not the
; callee/callsite.
; We cannot propagate that attribute to another call since it can be invalid at
; that call.
define i32 @test8(i8* %ptr, i64 %x) {
; CHECK-LABEL: @test8(
; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, i8* [[PTR:%.*]], i64 [[X:%.*]]
; CHECK-NEXT: [[R_I:%.*]] = call i32 @intrinsic(i8* noalias [[GEP]])
; CHECK-NEXT: ret i32 [[R_I]]
;
%gep = getelementptr inbounds i8, i8* %ptr, i64 %x
%t = call signext i32 @callee8(i8* %gep)
ret i32 %t
}
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