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1; Check that we create copy the data from the alloca into the coroutine2; frame slot if it was written to.3; RUN: opt < %s -passes='cgscc(coro-split),simplifycfg,early-cse' -S | FileCheck %s4 5define ptr @f() presplitcoroutine {6entry:7 %a.addr = alloca i64 ; read-only before coro.begin8 %a = load i64, ptr %a.addr ; cannot modify the value, don't need to copy9 10 %x.addr = alloca i6411 call void @use(ptr %x.addr) ; uses %x.addr before coro.begin12 13 %y.addr = alloca i6414 15 %z.addr = alloca i6416 %flag = call i1 @check()17 br i1 %flag, label %flag_true, label %flag_merge18 19flag_true:20 call void @use(ptr %z.addr) ; conditionally used %z.addr21 br label %flag_merge22 23flag_merge:24 %id = call token @llvm.coro.id(i32 0, ptr null, ptr null, ptr null)25 %size = call i32 @llvm.coro.size.i32()26 %alloc = call ptr @myAlloc(i32 %size)27 %hdl = call ptr @llvm.coro.begin(token %id, ptr %alloc)28 call void @llvm.memset.p0.i32(ptr %y.addr, i8 1, i32 4, i1 false)29 %0 = call i8 @llvm.coro.suspend(token none, i1 false)30 switch i8 %0, label %suspend [i8 0, label %resume31 i8 1, label %cleanup]32resume:33 call void @use(ptr %a.addr)34 call void @use(ptr %x.addr)35 call void @use(ptr %y.addr)36 call void @use(ptr %z.addr)37 br label %cleanup38 39cleanup:40 %mem = call ptr @llvm.coro.free(token %id, ptr %hdl)41 call void @free(ptr %mem)42 br label %suspend43suspend:44 call void @llvm.coro.end(ptr %hdl, i1 0, token none)45 ret ptr %hdl46}47 48; See that we added both x and y to the frame.49; CHECK: %f.Frame = type { ptr, ptr, i64, i64, i64, i64, i1 }50 51; See that all of the uses prior to coro-begin stays put.52; CHECK-LABEL: define ptr @f() {53; CHECK-NEXT: entry:54; CHECK-NEXT: %a.addr = alloca i6455; CHECK-NEXT: %x.addr = alloca i6456; CHECK-NEXT: call void @use(ptr %x.addr)57; CHECK-NEXT: %z.addr = alloca i6458 59; See that we only copy the x as y was not modified prior to coro.begin.60; CHECK: store ptr @f.destroy, ptr %destroy.addr61; The next 3 instructions are to copy data in %x.addr from stack to frame.62; CHECK-NEXT: %0 = getelementptr inbounds %f.Frame, ptr %hdl, i32 0, i32 363; CHECK-NEXT: %1 = load i64, ptr %x.addr, align 464; CHECK-NEXT: store i64 %1, ptr %0, align 465; The next 3 instructions are to copy data in %z.addr from stack to frame.66; CHECK-NEXT: [[T2:%.+]] = getelementptr inbounds %f.Frame, ptr %hdl, i32 0, i32 567; CHECK-NEXT: [[T3:%.+]] = load i64, ptr %z.addr, align 468; CHECK-NEXT: store i64 [[T3]], ptr [[T2]], align 469; The next instruction is to recreate %y.cast in the original IR.70; CHECK-NEXT: %y.addr.reload.addr = getelementptr inbounds %f.Frame, ptr %hdl, i32 0, i32 471; CHECK-NEXT: call void @llvm.memset.p0.i32(ptr %y.addr.reload.addr, i8 1, i32 4, i1 false)72; CHECK-NEXT: %index.addr1 = getelementptr inbounds nuw %f.Frame, ptr %hdl, i32 0, i32 673; CHECK-NEXT: store i1 false, ptr %index.addr1, align 174; CHECK-NEXT: ret ptr %hdl75 76 77declare ptr @llvm.coro.free(token, ptr)78declare i32 @llvm.coro.size.i32()79declare i8 @llvm.coro.suspend(token, i1)80declare void @llvm.coro.resume(ptr)81declare void @llvm.coro.destroy(ptr)82 83declare token @llvm.coro.id(i32, ptr, ptr, ptr)84declare i1 @llvm.coro.alloc(token)85declare ptr @llvm.coro.begin(token, ptr)86declare void @llvm.coro.end(ptr, i1, token)87 88declare void @llvm.memset.p0.i32(ptr, i8, i32, i1)89 90declare noalias ptr @myAlloc(i32)91declare void @use(ptr)92declare void @free(ptr)93declare i1 @check()94