mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-17 03:30:28 +00:00
6c189ecbe6
library return value optimization for phi uses. Even when the phi itself is not dominated, the specific use may be dominated. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154647 91177308-0d34-0410-b5e6-96231b3b80d8
164 lines
4.6 KiB
LLVM
164 lines
4.6 KiB
LLVM
; RUN: opt -objc-arc-contract -S < %s | FileCheck %s
|
|
|
|
target datalayout = "e-p:64:64:64"
|
|
|
|
declare i8* @objc_retain(i8*)
|
|
declare void @objc_release(i8*)
|
|
declare i8* @objc_autorelease(i8*)
|
|
declare i8* @objc_autoreleaseReturnValue(i8*)
|
|
declare i8* @objc_retainAutoreleasedReturnValue(i8*)
|
|
|
|
declare void @use_pointer(i8*)
|
|
declare i8* @returner()
|
|
|
|
; CHECK: define void @test0
|
|
; CHECK: call void @use_pointer(i8* %0)
|
|
; CHECK: }
|
|
define void @test0(i8* %x) nounwind {
|
|
entry:
|
|
%0 = call i8* @objc_retain(i8* %x) nounwind
|
|
call void @use_pointer(i8* %x)
|
|
ret void
|
|
}
|
|
|
|
; CHECK: define void @test1
|
|
; CHECK: call void @use_pointer(i8* %0)
|
|
; CHECK: }
|
|
define void @test1(i8* %x) nounwind {
|
|
entry:
|
|
%0 = call i8* @objc_autorelease(i8* %x) nounwind
|
|
call void @use_pointer(i8* %x)
|
|
ret void
|
|
}
|
|
|
|
; Merge objc_retain and objc_autorelease into objc_retainAutorelease.
|
|
|
|
; CHECK: define void @test2(
|
|
; CHECK: tail call i8* @objc_retainAutorelease(i8* %x) nounwind
|
|
; CHECK: }
|
|
define void @test2(i8* %x) nounwind {
|
|
entry:
|
|
%0 = tail call i8* @objc_retain(i8* %x) nounwind
|
|
tail call i8* @objc_autorelease(i8* %0) nounwind
|
|
call void @use_pointer(i8* %x)
|
|
ret void
|
|
}
|
|
|
|
; Same as test2 but the value is returned. Do an RV optimization.
|
|
|
|
; CHECK: define i8* @test2b(
|
|
; CHECK: tail call i8* @objc_retainAutoreleaseReturnValue(i8* %x) nounwind
|
|
; CHECK: }
|
|
define i8* @test2b(i8* %x) nounwind {
|
|
entry:
|
|
%0 = tail call i8* @objc_retain(i8* %x) nounwind
|
|
tail call i8* @objc_autoreleaseReturnValue(i8* %0) nounwind
|
|
ret i8* %x
|
|
}
|
|
|
|
; Merge a retain,autorelease pair around a call.
|
|
|
|
; CHECK: define void @test3(
|
|
; CHECK: tail call i8* @objc_retainAutorelease(i8* %x) nounwind
|
|
; CHECK: @use_pointer(i8* %0)
|
|
; CHECK: }
|
|
define void @test3(i8* %x, i64 %n) {
|
|
entry:
|
|
tail call i8* @objc_retain(i8* %x) nounwind
|
|
call void @use_pointer(i8* %x)
|
|
tail call i8* @objc_autorelease(i8* %x) nounwind
|
|
ret void
|
|
}
|
|
|
|
; Trivial retain,autorelease pair with intervening call, but it's post-dominated
|
|
; by another release. The retain and autorelease can be merged.
|
|
|
|
; CHECK: define void @test4(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: @objc_retainAutorelease(i8* %x) nounwind
|
|
; CHECK-NEXT: @use_pointer
|
|
; CHECK-NEXT: @objc_release
|
|
; CHECK-NEXT: ret void
|
|
; CHECK-NEXT: }
|
|
define void @test4(i8* %x, i64 %n) {
|
|
entry:
|
|
tail call i8* @objc_retain(i8* %x) nounwind
|
|
call void @use_pointer(i8* %x)
|
|
tail call i8* @objc_autorelease(i8* %x) nounwind
|
|
tail call void @objc_release(i8* %x) nounwind
|
|
ret void
|
|
}
|
|
|
|
; Don't merge retain and autorelease if they're not control-equivalent.
|
|
|
|
; CHECK: define void @test5(
|
|
; CHECK: tail call i8* @objc_retain(i8* %p) nounwind
|
|
; CHECK: true:
|
|
; CHECK: tail call i8* @objc_autorelease(i8* %0) nounwind
|
|
; CHECK: }
|
|
define void @test5(i8* %p, i1 %a) {
|
|
entry:
|
|
tail call i8* @objc_retain(i8* %p) nounwind
|
|
br i1 %a, label %true, label %false
|
|
|
|
true:
|
|
tail call i8* @objc_autorelease(i8* %p) nounwind
|
|
call void @use_pointer(i8* %p)
|
|
ret void
|
|
|
|
false:
|
|
ret void
|
|
}
|
|
|
|
; Don't eliminate objc_retainAutoreleasedReturnValue by merging it into
|
|
; an objc_autorelease.
|
|
; TODO? Merge objc_retainAutoreleasedReturnValue and objc_autorelease into
|
|
; objc_retainAutoreleasedReturnValueAutorelease and merge
|
|
; objc_retainAutoreleasedReturnValue and objc_autoreleaseReturnValue
|
|
; into objc_retainAutoreleasedReturnValueAutoreleaseReturnValue?
|
|
; Those entrypoints don't exist yet though.
|
|
|
|
; CHECK: define i8* @test6(
|
|
; CHECK: call i8* @objc_retainAutoreleasedReturnValue(i8* %p) nounwind
|
|
; CHECK: %t = tail call i8* @objc_autoreleaseReturnValue(i8* %1) nounwind
|
|
; CHECK: }
|
|
define i8* @test6() {
|
|
%p = call i8* @returner()
|
|
tail call i8* @objc_retainAutoreleasedReturnValue(i8* %p) nounwind
|
|
%t = tail call i8* @objc_autoreleaseReturnValue(i8* %p) nounwind
|
|
call void @use_pointer(i8* %t)
|
|
ret i8* %t
|
|
}
|
|
|
|
; Don't spoil the RV optimization.
|
|
|
|
; CHECK: define i8* @test7(i8* %p)
|
|
; CHECK: tail call i8* @objc_retain(i8* %p)
|
|
; CHECK: call void @use_pointer(i8* %1)
|
|
; CHECK: tail call i8* @objc_autoreleaseReturnValue(i8* %1)
|
|
; CHECK: ret i8* %2
|
|
define i8* @test7(i8* %p) {
|
|
%1 = tail call i8* @objc_retain(i8* %p)
|
|
call void @use_pointer(i8* %p)
|
|
%2 = tail call i8* @objc_autoreleaseReturnValue(i8* %p)
|
|
ret i8* %p
|
|
}
|
|
|
|
; Do the return value substitution for PHI nodes too.
|
|
|
|
; CHECK: define i8* @test8(
|
|
; CHECK: %retval = phi i8* [ %p, %if.then ], [ null, %entry ]
|
|
; CHECK: }
|
|
define i8* @test8(i1 %x, i8* %c) {
|
|
entry:
|
|
br i1 %x, label %return, label %if.then
|
|
|
|
if.then: ; preds = %entry
|
|
%p = call i8* @objc_retain(i8* %c) nounwind
|
|
br label %return
|
|
|
|
return: ; preds = %if.then, %entry
|
|
%retval = phi i8* [ %c, %if.then ], [ null, %entry ]
|
|
ret i8* %retval
|
|
}
|