51d5d7bbae
One of the main user of these kind of coroutines is swift. There yield-once (`retcon.once`) coroutines are used to temporary "expose" pointers to internal fields of various objects creating borrow scopes. However, in some cases it might be useful also to allow these coroutines to produce a normal result, but there is no convenient way to represent this (as compared to switched-resume kind of coroutines where C++ `co_return` is transformed to a member / callback call on promise object). The extension is simple: we allow continuation function to have a non-void result and accept optional extra arguments via a special `llvm.coro.end.result` intrinsic that would essentially forward them as normal results.
131 lines
4.5 KiB
LLVM
131 lines
4.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; Verifies that LICM is disabled for loops that contains coro.suspend.
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; RUN: opt -S < %s -passes=licm | FileCheck %s
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define i64 @licm(i64 %n) #0 {
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; CHECK-LABEL: define i64 @licm
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; CHECK-SAME: (i64 [[N:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[P:%.*]] = alloca i64, align 8
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; CHECK-NEXT: br label [[BB0:%.*]]
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; CHECK: bb0:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[I:%.*]] = phi i64 [ 0, [[BB0]] ], [ [[T5:%.*]], [[AWAIT_READY:%.*]] ]
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; CHECK-NEXT: [[T5]] = add i64 [[I]], 1
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; CHECK-NEXT: [[SUSPEND:%.*]] = call i8 @llvm.coro.suspend(token none, i1 false)
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; CHECK-NEXT: switch i8 [[SUSPEND]], label [[BB2:%.*]] [
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; CHECK-NEXT: i8 0, label [[AWAIT_READY]]
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; CHECK-NEXT: ]
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; CHECK: await.ready:
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; CHECK-NEXT: store i64 1, ptr [[P]], align 4
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; CHECK-NEXT: [[T6:%.*]] = icmp ult i64 [[T5]], [[N]]
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; CHECK-NEXT: br i1 [[T6]], label [[LOOP]], label [[BB2]]
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; CHECK: bb2:
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; CHECK-NEXT: [[RES:%.*]] = call i1 @llvm.coro.end(ptr null, i1 false, token none)
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; CHECK-NEXT: ret i64 0
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;
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entry:
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%p = alloca i64
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br label %bb0
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bb0:
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br label %loop
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loop:
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%i = phi i64 [ 0, %bb0 ], [ %t5, %await.ready ]
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%t5 = add i64 %i, 1
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%suspend = call i8 @llvm.coro.suspend(token none, i1 false)
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switch i8 %suspend, label %bb2 [
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i8 0, label %await.ready
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]
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await.ready:
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store i64 1, ptr %p
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%t6 = icmp ult i64 %t5, %n
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br i1 %t6, label %loop, label %bb2
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bb2:
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%res = call i1 @llvm.coro.end(ptr null, i1 false, token none)
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ret i64 0
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}
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@tls = thread_local global i32 0
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define i64 @hoist_threadlocal() presplitcoroutine {
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; CHECK-LABEL: define i64 @hoist_threadlocal
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; CHECK-SAME: () #[[ATTR0:[0-9]+]] {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[P:%.*]] = alloca i64, align 8
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; CHECK-NEXT: br label [[LOOP_PREHEADER:%.*]]
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; CHECK: loop.preheader:
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: [[I:%.*]] = phi i64 [ 0, [[LOOP_PREHEADER]] ], [ [[I_NEXT:%.*]], [[LOOP_END:%.*]] ]
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; CHECK-NEXT: [[I_NEXT]] = add i64 [[I]], 1
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; CHECK-NEXT: [[THREAD_LOCAL_0:%.*]] = call ptr @llvm.threadlocal.address.p0(ptr @tls)
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; CHECK-NEXT: [[READONLY_0:%.*]] = call ptr @readonly_funcs()
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; CHECK-NEXT: [[SUSPEND:%.*]] = call i8 @llvm.coro.suspend(token none, i1 false)
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; CHECK-NEXT: switch i8 [[SUSPEND]], label [[EXIT:%.*]] [
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; CHECK-NEXT: i8 0, label [[AWAIT_READY:%.*]]
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; CHECK-NEXT: ]
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; CHECK: await.ready:
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; CHECK-NEXT: [[THREAD_LOCAL_1:%.*]] = call ptr @llvm.threadlocal.address.p0(ptr @tls)
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; CHECK-NEXT: [[READONLY_1:%.*]] = call ptr @readonly_funcs()
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; CHECK-NEXT: [[CMP_0:%.*]] = icmp eq ptr [[THREAD_LOCAL_0]], [[THREAD_LOCAL_1]]
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; CHECK-NEXT: [[CMP_1:%.*]] = icmp eq ptr [[READONLY_0]], [[READONLY_1]]
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; CHECK-NEXT: [[CMP:%.*]] = and i1 [[CMP_0]], [[CMP_1]]
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; CHECK-NEXT: br i1 [[CMP]], label [[NOT_REACHABLE:%.*]], label [[LOOP_END]]
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; CHECK: not.reachable:
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; CHECK-NEXT: call void @not.reachable()
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; CHECK-NEXT: br label [[LOOP_END]]
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; CHECK: loop.end:
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; CHECK-NEXT: br i1 [[CMP]], label [[EXIT]], label [[FOR_BODY]]
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; CHECK: exit:
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; CHECK-NEXT: [[RES:%.*]] = call i1 @llvm.coro.end(ptr null, i1 false, token none)
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; CHECK-NEXT: ret i64 0
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;
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entry:
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%p = alloca i64
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br label %loop.preheader
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loop.preheader:
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br label %for.body
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for.body:
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%i = phi i64 [ 0, %loop.preheader ], [ %i.next, %loop.end ]
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%i.next = add i64 %i, 1
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%thread_local.0 = call ptr @llvm.threadlocal.address(ptr @tls)
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%readonly.0 = call ptr @readonly_funcs()
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%suspend = call i8 @llvm.coro.suspend(token none, i1 false)
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switch i8 %suspend, label %exit [
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i8 0, label %await.ready
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]
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await.ready:
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%thread_local.1 = call ptr @llvm.threadlocal.address(ptr @tls)
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%readonly.1 = call ptr @readonly_funcs()
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%cmp.0 = icmp eq ptr %thread_local.0, %thread_local.1
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%cmp.1 = icmp eq ptr %readonly.0, %readonly.1
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%cmp = and i1 %cmp.0, %cmp.1
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br i1 %cmp, label %not.reachable, label %loop.end
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not.reachable:
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call void @not.reachable()
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br label %loop.end
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loop.end:
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%loop.end.cond = icmp ugt i64 %i.next, 5
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br i1 %cmp, label %exit, label %for.body
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exit:
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%res = call i1 @llvm.coro.end(ptr null, i1 false, token none)
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ret i64 0
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}
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declare i8 @llvm.coro.suspend(token, i1)
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declare i1 @llvm.coro.end(ptr, i1, token)
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declare nonnull ptr @readonly_funcs() readonly
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declare nonnull ptr @llvm.threadlocal.address(ptr nonnull) nounwind readnone willreturn
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declare void @not.reachable()
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