[Coroutines] Presubmit retcon without suspend test

The test gets incorrectly optimized to unreachable.

Author: Flakebi

llvm/test/Transforms/Coroutines/coro-retcon.ll

@@ -1,6 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; First example from Doc/Coroutines.rst (two block loop) converted to retcon
 ; RUN: opt < %s -passes='default<O2>' -S | FileCheck %s
+; RUN: opt < %s -passes='module(coro-early),cgscc(coro-split),module(coro-cleanup)' -S | FileCheck --check-prefix=CORO %s
 
 define i8* @f(i8* %buffer, i32 %n) {
 ; CHECK-LABEL: @f(
@@ -10,6 +11,15 @@ define i8* @f(i8* %buffer, i32 %n) {
 ; CHECK-NEXT:    tail call void @print(i32 [[N]])
 ; CHECK-NEXT:    ret i8* bitcast (i8* (i8*, i1)* @f.resume.0 to i8*)
 ;
+; CORO-LABEL: @f(
+; CORO-NEXT:  entry:
+; CORO-NEXT:    [[FRAMEPTR:%.*]] = bitcast i8* [[BUFFER:%.*]] to %f.Frame*
+; CORO-NEXT:    [[N_VAL_SPILL_ADDR:%.*]] = getelementptr inbounds [[F_FRAME:%.*]], %f.Frame* [[FRAMEPTR]], i32 0, i32 0
+; CORO-NEXT:    store i32 [[N:%.*]], i32* [[N_VAL_SPILL_ADDR]], align 4
+; CORO-NEXT:    call void @print(i32 [[N]])
+; CORO-NEXT:    [[TMP0:%.*]] = bitcast i8* (i8*, i1)* @f.resume.0 to i8*
+; CORO-NEXT:    ret i8* [[TMP0]]
+;
 entry:
   %id = call token @llvm.coro.id.retcon(i32 8, i32 4, i8* %buffer, i8* bitcast (i8* (i8*, i1)* @prototype to i8*), i8* bitcast (i8* (i32)* @allocate to i8*), i8* bitcast (void (i8*)* @deallocate to i8*))
   %hdl = call i8* @llvm.coro.begin(token %id, i8* null)
@@ -35,11 +45,24 @@ cleanup:
 define i32 @main() {
 ; CHECK-LABEL: @main(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    call void @print(i32 4)
-; CHECK-NEXT:    call void @print(i32 5), !noalias !0
-; CHECK-NEXT:    call void @print(i32 6), !noalias !3
+; CHECK-NEXT:    tail call void @print(i32 4)
+; CHECK-NEXT:    tail call void @print(i32 5), !noalias !0
+; CHECK-NEXT:    tail call void @print(i32 6), !noalias !3
 ; CHECK-NEXT:    ret i32 0
 ;
+; CORO-LABEL: @main(
+; CORO-NEXT:  entry:
+; CORO-NEXT:    [[TMP0:%.*]] = alloca [8 x i8], align 4
+; CORO-NEXT:    [[BUFFER:%.*]] = bitcast [8 x i8]* [[TMP0]] to i8*
+; CORO-NEXT:    [[CONT0:%.*]] = call i8* @f(i8* [[BUFFER]], i32 4)
+; CORO-NEXT:    [[CONT0_CAST:%.*]] = bitcast i8* [[CONT0]] to i8* (i8*, i1)*
+; CORO-NEXT:    [[CONT1:%.*]] = call i8* [[CONT0_CAST]](i8* [[BUFFER]], i1 zeroext false)
+; CORO-NEXT:    [[CONT1_CAST:%.*]] = bitcast i8* [[CONT1]] to i8* (i8*, i1)*
+; CORO-NEXT:    [[CONT2:%.*]] = call i8* [[CONT1_CAST]](i8* [[BUFFER]], i1 zeroext false)
+; CORO-NEXT:    [[CONT2_CAST:%.*]] = bitcast i8* [[CONT2]] to i8* (i8*, i1)*
+; CORO-NEXT:    [[TMP1:%.*]] = call i8* [[CONT2_CAST]](i8* [[BUFFER]], i1 zeroext true)
+; CORO-NEXT:    ret i32 0
+;
 entry:
   %0 = alloca [8 x i8], align 4
   %buffer = bitcast [8 x i8]* %0 to i8*
@@ -70,6 +93,22 @@ define hidden { i8*, i8* } @g(i8* %buffer, i16* %ptr) {
 ; CHECK-NEXT:    [[TMP3:%.*]] = insertvalue { i8*, i8* } { i8* bitcast ({ i8*, i8* } (i8*, i1)* @g.resume.0 to i8*), i8* undef }, i8* [[TMP2]], 1
 ; CHECK-NEXT:    ret { i8*, i8* } [[TMP3]]
 ;
+; CORO-LABEL: @g(
+; CORO-NEXT:  entry:
+; CORO-NEXT:    [[TMP0:%.*]] = call i8* @allocate(i32 8)
+; CORO-NEXT:    [[TMP1:%.*]] = bitcast i8* [[BUFFER:%.*]] to i8**
+; CORO-NEXT:    store i8* [[TMP0]], i8** [[TMP1]], align 8
+; CORO-NEXT:    [[FRAMEPTR:%.*]] = bitcast i8* [[TMP0]] to %g.Frame*
+; CORO-NEXT:    [[PTR_SPILL_ADDR:%.*]] = getelementptr inbounds [[G_FRAME:%.*]], %g.Frame* [[FRAMEPTR]], i32 0, i32 0
+; CORO-NEXT:    store i16* [[PTR:%.*]], i16** [[PTR_SPILL_ADDR]], align 8
+; CORO-NEXT:    [[PTR_RELOAD_ADDR:%.*]] = getelementptr inbounds [[G_FRAME]], %g.Frame* [[FRAMEPTR]], i32 0, i32 0
+; CORO-NEXT:    [[PTR_RELOAD:%.*]] = load i16*, i16** [[PTR_RELOAD_ADDR]], align 8
+; CORO-NEXT:    [[PTR2:%.*]] = bitcast i16* [[PTR_RELOAD]] to i8*
+; CORO-NEXT:    [[TMP2:%.*]] = bitcast { i8*, i8* } (i8*, i1)* @g.resume.0 to i8*
+; CORO-NEXT:    [[TMP3:%.*]] = insertvalue { i8*, i8* } undef, i8* [[TMP2]], 0
+; CORO-NEXT:    [[TMP4:%.*]] = insertvalue { i8*, i8* } [[TMP3]], i8* [[PTR2]], 1
+; CORO-NEXT:    ret { i8*, i8* } [[TMP4]]
+;
 entry:
   %id = call token @llvm.coro.id.retcon(i32 8, i32 4, i8* %buffer, i8* bitcast ({ i8*, i8* } (i8*, i1)* @g_prototype to i8*), i8* bitcast (i8* (i32)* @allocate to i8*), i8* bitcast (void (i8*)* @deallocate to i8*))
   %hdl = call i8* @llvm.coro.begin(token %id, i8* null)
@@ -88,12 +127,45 @@ cleanup:
   unreachable
 }
 
+define i8* @nosuspend(i8* %buffer, i32 %n) {
+; CHECK-LABEL: @nosuspend(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    unreachable
+;
+; CORO-LABEL: @nosuspend(
+; CORO-NEXT:  entry:
+; CORO-NEXT:    [[FRAMEPTR:%.*]] = bitcast i8* undef to %nosuspend.Frame*
+; CORO-NEXT:    [[A:%.*]] = getelementptr inbounds [[NOSUSPEND_FRAME:%.*]], %nosuspend.Frame* [[FRAMEPTR]], i32 0, i32 0
+; CORO-NEXT:    store i32 [[N:%.*]], i32* [[A]], align 4
+; CORO-NEXT:    call void @use_var_ptr(i32* [[A]])
+; CORO-NEXT:    [[AL:%.*]] = load i32, i32* [[A]], align 4
+; CORO-NEXT:    call void @use_var(i32 [[AL]])
+; CORO-NEXT:    ret i8* null
+;
+entry:
+  %id = call token @llvm.coro.id.retcon(i32 8, i32 4, i8* %buffer, i8* bitcast (i8* (i8*, i1)* @prototype to i8*), i8* bitcast (i8* (i32)* @allocate to i8*), i8* bitcast (void (i8*)* @deallocate to i8*))
+  %hdl = call i8* @llvm.coro.begin(token %id, i8* null)
+  %a = alloca i32
+  store i32 %n, i32* %a
+  br label %cleanup
+
+cleanup:
+  call void @use_var_ptr(i32* %a)
+  %al = load i32, i32* %a
+  call void @use_var(i32 %al)
+  call i1 @llvm.coro.end(i8* %hdl, i1 0)
+  ret i8* %hdl
+}
+
 declare token @llvm.coro.id.retcon(i32, i32, i8*, i8*, i8*, i8*)
 declare i8* @llvm.coro.begin(token, i8*)
 declare i1 @llvm.coro.suspend.retcon.i1(...)
 declare i1 @llvm.coro.end(i8*, i1)
 declare i8* @llvm.coro.prepare.retcon(i8*)
 
+declare void @use_var(i32)
+declare void @use_var_ptr(i32*)
+
 declare i8* @prototype(i8*, i1 zeroext)
 declare {i8*,i8*} @g_prototype(i8*, i1 zeroext)