2019-04-17 06:52:47 +02:00
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; Fifth example from Doc/Coroutines.rst (final suspend)
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2020-03-25 21:58:09 +01:00
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; RUN: opt < %s -aa-pipeline=basic-aa -passes='default<O2>' -enable-coroutines -preserve-alignment-assumptions-during-inlining=false -S | FileCheck %s
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2019-04-17 06:52:47 +02:00
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2021-04-19 02:20:02 +02:00
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define i8* @f(i32 %n) {
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2019-04-17 06:52:47 +02:00
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entry:
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%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
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%size = call i32 @llvm.coro.size.i32()
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%alloc = call i8* @malloc(i32 %size)
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%hdl = call noalias i8* @llvm.coro.begin(token %id, i8* %alloc)
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br label %while.cond
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while.cond:
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%n.val = phi i32 [ %n, %entry ], [ %dec, %while.body ]
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%cmp = icmp sgt i32 %n.val, 0
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br i1 %cmp, label %while.body, label %while.end
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while.body:
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%dec = add nsw i32 %n.val, -1
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call void @print(i32 %n.val) #4
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%s = call i8 @llvm.coro.suspend(token none, i1 false)
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switch i8 %s, label %suspend [i8 0, label %while.cond
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i8 1, label %cleanup]
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while.end:
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%s.final = call i8 @llvm.coro.suspend(token none, i1 true)
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switch i8 %s.final, label %suspend [i8 0, label %trap
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i8 1, label %cleanup]
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trap:
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call void @llvm.trap()
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unreachable
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cleanup:
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%mem = call i8* @llvm.coro.free(token %id, i8* %hdl)
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call void @free(i8* %mem)
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br label %suspend
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suspend:
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call i1 @llvm.coro.end(i8* %hdl, i1 false)
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ret i8* %hdl
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}
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declare noalias i8* @malloc(i32)
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declare void @print(i32)
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declare void @llvm.trap()
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declare void @free(i8* nocapture)
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declare token @llvm.coro.id( i32, i8*, i8*, i8*)
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declare i32 @llvm.coro.size.i32()
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declare i8* @llvm.coro.begin(token, i8*)
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declare token @llvm.coro.save(i8*)
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declare i8 @llvm.coro.suspend(token, i1)
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declare i8* @llvm.coro.free(token, i8*)
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declare i1 @llvm.coro.end(i8*, i1)
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; CHECK-LABEL: @main
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define i32 @main() {
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entry:
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%hdl = call i8* @f(i32 4)
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br label %while
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while:
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call void @llvm.coro.resume(i8* %hdl)
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%done = call i1 @llvm.coro.done(i8* %hdl)
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br i1 %done, label %end, label %while
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end:
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call void @llvm.coro.destroy(i8* %hdl)
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ret i32 0
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; CHECK: call void @print(i32 4)
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; CHECK: call void @print(i32 3)
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; CHECK: call void @print(i32 2)
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; CHECK: call void @print(i32 1)
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; CHECK: ret i32 0
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}
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declare i1 @llvm.coro.done(i8*)
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declare void @llvm.coro.resume(i8*)
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declare void @llvm.coro.destroy(i8*)
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