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| ; Tests that the dynamic allocation and deallocation of the coroutine frame is
; elided and any tail calls referencing the coroutine frame has the tail
; call attribute removed.
; RUN: opt < %s -S -inline -coro-elide -instsimplify -simplifycfg | FileCheck %s
declare void @print(i32) nounwind
%f.frame = type {i32}
declare void @bar(i8*)
declare fastcc void @f.resume(%f.frame*)
declare fastcc void @f.destroy(%f.frame*)
declare fastcc void @f.cleanup(%f.frame*)
declare void @may_throw()
declare i8* @CustomAlloc(i32)
declare void @CustomFree(i8*)
@f.resumers = internal constant [3 x void (%f.frame*)*]
[void (%f.frame*)* @f.resume, void (%f.frame*)* @f.destroy, void (%f.frame*)* @f.cleanup]
; a coroutine start function
define i8* @f() personality i8* null {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null,
i8* bitcast (i8*()* @f to i8*),
i8* bitcast ([3 x void (%f.frame*)*]* @f.resumers to i8*))
%need.dyn.alloc = call i1 @llvm.coro.alloc(token %id)
br i1 %need.dyn.alloc, label %dyn.alloc, label %coro.begin
dyn.alloc:
%alloc = call i8* @CustomAlloc(i32 4)
br label %coro.begin
coro.begin:
%phi = phi i8* [ null, %entry ], [ %alloc, %dyn.alloc ]
%hdl = call i8* @llvm.coro.begin(token %id, i8* %phi)
invoke void @may_throw()
to label %ret unwind label %ehcleanup
ret:
ret i8* %hdl
ehcleanup:
%tok = cleanuppad within none []
%mem = call i8* @llvm.coro.free(token %id, i8* %hdl)
%need.dyn.free = icmp ne i8* %mem, null
br i1 %need.dyn.free, label %dyn.free, label %if.end
dyn.free:
call void @CustomFree(i8* %mem)
br label %if.end
if.end:
cleanupret from %tok unwind to caller
}
; CHECK-LABEL: @callResume(
define void @callResume() {
entry:
; CHECK: alloca %f.frame
; CHECK-NOT: coro.begin
; CHECK-NOT: CustomAlloc
; CHECK: call void @may_throw()
%hdl = call i8* @f()
; Need to remove 'tail' from the first call to @bar
; CHECK-NOT: tail call void @bar(
; CHECK: call void @bar(
tail call void @bar(i8* %hdl)
; CHECK: tail call void @bar(
tail call void @bar(i8* null)
; CHECK-NEXT: call fastcc void bitcast (void (%f.frame*)* @f.resume to void (i8*)*)(i8* %vFrame)
%0 = call i8* @llvm.coro.subfn.addr(i8* %hdl, i8 0)
%1 = bitcast i8* %0 to void (i8*)*
call fastcc void %1(i8* %hdl)
; CHECK-NEXT: call fastcc void bitcast (void (%f.frame*)* @f.cleanup to void (i8*)*)(i8* %vFrame)
%2 = call i8* @llvm.coro.subfn.addr(i8* %hdl, i8 1)
%3 = bitcast i8* %2 to void (i8*)*
call fastcc void %3(i8* %hdl)
; CHECK-NEXT: ret void
ret void
}
; CHECK-LABEL: @callResume_PR34897_no_elision(
define void @callResume_PR34897_no_elision(i1 %cond) {
; CHECK-LABEL: entry:
entry:
; CHECK: call i8* @CustomAlloc(
%hdl = call i8* @f()
; CHECK: tail call void @bar(
tail call void @bar(i8* %hdl)
; CHECK: tail call void @bar(
tail call void @bar(i8* null)
br i1 %cond, label %if.then, label %if.else
; CHECK-LABEL: if.then:
if.then:
; CHECK: call fastcc void bitcast (void (%f.frame*)* @f.resume to void (i8*)*)(i8*
%0 = call i8* @llvm.coro.subfn.addr(i8* %hdl, i8 0)
%1 = bitcast i8* %0 to void (i8*)*
call fastcc void %1(i8* %hdl)
; CHECK-NEXT: call fastcc void bitcast (void (%f.frame*)* @f.destroy to void (i8*)*)(i8*
%2 = call i8* @llvm.coro.subfn.addr(i8* %hdl, i8 1)
%3 = bitcast i8* %2 to void (i8*)*
call fastcc void %3(i8* %hdl)
br label %return
if.else:
br label %return
; CHECK-LABEL: return:
return:
; CHECK: ret void
ret void
}
; a coroutine start function (cannot elide heap alloc, due to second argument to
; coro.begin not pointint to coro.alloc)
define i8* @f_no_elision() personality i8* null {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null,
i8* bitcast (i8*()* @f_no_elision to i8*),
i8* bitcast ([3 x void (%f.frame*)*]* @f.resumers to i8*))
%alloc = call i8* @CustomAlloc(i32 4)
%hdl = call i8* @llvm.coro.begin(token %id, i8* %alloc)
ret i8* %hdl
}
; CHECK-LABEL: @callResume_no_elision(
define void @callResume_no_elision() {
entry:
; CHECK: call i8* @CustomAlloc(
%hdl = call i8* @f_no_elision()
; Tail call should remain tail calls
; CHECK: tail call void @bar(
tail call void @bar(i8* %hdl)
; CHECK: tail call void @bar(
tail call void @bar(i8* null)
; CHECK-NEXT: call fastcc void bitcast (void (%f.frame*)* @f.resume to void (i8*)*)(i8*
%0 = call i8* @llvm.coro.subfn.addr(i8* %hdl, i8 0)
%1 = bitcast i8* %0 to void (i8*)*
call fastcc void %1(i8* %hdl)
; CHECK-NEXT: call fastcc void bitcast (void (%f.frame*)* @f.destroy to void (i8*)*)(i8*
%2 = call i8* @llvm.coro.subfn.addr(i8* %hdl, i8 1)
%3 = bitcast i8* %2 to void (i8*)*
call fastcc void %3(i8* %hdl)
; CHECK-NEXT: ret void
ret void
}
declare token @llvm.coro.id(i32, i8*, i8*, i8*)
declare i1 @llvm.coro.alloc(token)
declare i8* @llvm.coro.free(token, i8*)
declare i8* @llvm.coro.begin(token, i8*)
declare i8* @llvm.coro.frame(token)
declare i8* @llvm.coro.subfn.addr(i8*, i8)
|