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|
; Test no suspend coroutines
; RUN: opt < %s -O2 -enable-coroutines -S | FileCheck %s
; Coroutine with no-suspends will turn into:
;
; CHECK-LABEL: define void @no_suspends(
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @print(i32 %n)
; CHECK-NEXT: ret void
;
define void @no_suspends(i32 %n) {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%need.dyn.alloc = call i1 @llvm.coro.alloc(token %id)
br i1 %need.dyn.alloc, label %dyn.alloc, label %coro.begin
dyn.alloc:
%size = call i32 @llvm.coro.size.i32()
%alloc = call i8* @malloc(i32 %size)
br label %coro.begin
coro.begin:
%phi = phi i8* [ null, %entry ], [ %alloc, %dyn.alloc ]
%hdl = call noalias i8* @llvm.coro.begin(token %id, i8* %phi)
br label %body
body:
call void @print(i32 %n)
br label %cleanup
cleanup:
%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 %suspend
dyn.free:
call void @free(i8* %mem)
br label %suspend
suspend:
call i1 @llvm.coro.end(i8* %hdl, i1 false)
ret void
}
; SimplifySuspendPoint will detect that coro.resume resumes itself and will
; replace suspend with a jump to %resume label turning it into no-suspend
; coroutine.
;
; CHECK-LABEL: define void @simplify_resume(
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @print(i32 0)
; CHECK-NEXT: ret void
;
define void @simplify_resume() {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%need.dyn.alloc = call i1 @llvm.coro.alloc(token %id)
br i1 %need.dyn.alloc, label %dyn.alloc, label %coro.begin
dyn.alloc:
%size = call i32 @llvm.coro.size.i32()
%alloc = call i8* @malloc(i32 %size)
br label %coro.begin
coro.begin:
%phi = phi i8* [ null, %entry ], [ %alloc, %dyn.alloc ]
%hdl = call noalias i8* @llvm.coro.begin(token %id, i8* %phi)
br label %body
body:
%save = call token @llvm.coro.save(i8* %hdl)
call void @llvm.coro.resume(i8* %hdl)
%0 = call i8 @llvm.coro.suspend(token %save, i1 false)
switch i8 %0, label %suspend [i8 0, label %resume
i8 1, label %pre.cleanup]
resume:
call void @print(i32 0)
br label %cleanup
pre.cleanup:
call void @print(i32 1)
br label %cleanup
cleanup:
%mem = call i8* @llvm.coro.free(token %id, i8* %hdl)
call void @free(i8* %mem)
br label %suspend
suspend:
call i1 @llvm.coro.end(i8* %hdl, i1 false)
ret void
}
; SimplifySuspendPoint will detect that coroutine destroys itself and will
; replace suspend with a jump to %cleanup label turning it into no-suspend
; coroutine.
;
; CHECK-LABEL: define void @simplify_destroy(
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @print(i32 1)
; CHECK-NEXT: ret void
;
define void @simplify_destroy() {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%need.dyn.alloc = call i1 @llvm.coro.alloc(token %id)
br i1 %need.dyn.alloc, label %dyn.alloc, label %coro.begin
dyn.alloc:
%size = call i32 @llvm.coro.size.i32()
%alloc = call i8* @malloc(i32 %size)
br label %coro.begin
coro.begin:
%phi = phi i8* [ null, %entry ], [ %alloc, %dyn.alloc ]
%hdl = call noalias i8* @llvm.coro.begin(token %id, i8* %phi)
br label %body
body:
%save = call token @llvm.coro.save(i8* %hdl)
call void @llvm.coro.destroy(i8* %hdl)
%0 = call i8 @llvm.coro.suspend(token %save, i1 false)
switch i8 %0, label %suspend [i8 0, label %resume
i8 1, label %pre.cleanup]
resume:
call void @print(i32 0)
br label %cleanup
pre.cleanup:
call void @print(i32 1)
br label %cleanup
cleanup:
%mem = call i8* @llvm.coro.free(token %id, i8* %hdl)
call void @free(i8* %mem)
br label %suspend
suspend:
call i1 @llvm.coro.end(i8* %hdl, i1 false)
ret void
}
; SimplifySuspendPoint won't be able to simplify if it detects that there are
; other calls between coro.save and coro.suspend. They potentially can call
; resume or destroy, so we should not simplify this suspend point.
;
; CHECK-LABEL: define void @cannot_simplify(
; CHECK-NEXT: entry:
; CHECK-NEXT: call i8* @malloc
define void @cannot_simplify() {
entry:
%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
%need.dyn.alloc = call i1 @llvm.coro.alloc(token %id)
br i1 %need.dyn.alloc, label %dyn.alloc, label %coro.begin
dyn.alloc:
%size = call i32 @llvm.coro.size.i32()
%alloc = call i8* @malloc(i32 %size)
br label %coro.begin
coro.begin:
%phi = phi i8* [ null, %entry ], [ %alloc, %dyn.alloc ]
%hdl = call noalias i8* @llvm.coro.begin(token %id, i8* %phi)
br label %body
body:
%save = call token @llvm.coro.save(i8* %hdl)
call void @foo()
call void @llvm.coro.destroy(i8* %hdl)
%0 = call i8 @llvm.coro.suspend(token %save, i1 false)
switch i8 %0, label %suspend [i8 0, label %resume
i8 1, label %pre.cleanup]
resume:
call void @print(i32 0)
br label %cleanup
pre.cleanup:
call void @print(i32 1)
br label %cleanup
cleanup:
%mem = call i8* @llvm.coro.free(token %id, i8* %hdl)
call void @free(i8* %mem)
br label %suspend
suspend:
call i1 @llvm.coro.end(i8* %hdl, i1 false)
ret void
}
declare i8* @malloc(i32)
declare void @free(i8*)
declare void @print(i32)
declare void @foo()
declare token @llvm.coro.id(i32, i8*, i8*, i8*)
declare i1 @llvm.coro.alloc(token)
declare i32 @llvm.coro.size.i32()
declare i8* @llvm.coro.begin(token, i8*)
declare token @llvm.coro.save(i8* %hdl)
declare i8 @llvm.coro.suspend(token, i1)
declare i8* @llvm.coro.free(token, i8*)
declare i1 @llvm.coro.end(i8*, i1)
declare void @llvm.coro.resume(i8*)
declare void @llvm.coro.destroy(i8*)
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