[llvm] e603285 - [Test] Add hanging test for D146276

[Max Kazantsev via llvm-commits]

Author: Max Kazantsev
Date: 2023-03-22T14:26:44+07:00
New Revision: e603285316cb5112c5e44ffaa1712381dab37527

URL: https://github.com/llvm/llvm-project/commit/e603285316cb5112c5e44ffaa1712381dab37527
DIFF: https://github.com/llvm/llvm-project/commit/e603285316cb5112c5e44ffaa1712381dab37527.diff

LOG: [Test] Add hanging test for D146276

The patch was reverted because of hang, adding the test so that this doesn't
happen again.

Added: 
    llvm/test/Transforms/GuardWidening/hang.ll

Modified: 
    

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/GuardWidening/hang.ll b/llvm/test/Transforms/GuardWidening/hang.ll
new file mode 100644
index 0000000000000..071a201ab6079
--- /dev/null
+++ b/llvm/test/Transforms/GuardWidening/hang.ll
@@ -0,0 +1,32 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
+; RUN: opt -S -passes=guard-widening < %s | FileCheck %s
+
+; Make sure we don't hang here.
+define i64 @test() {
+; CHECK-LABEL: define i64 @test() {
+; CHECK-NEXT:  bb:
+; CHECK-NEXT:    [[WIDE_CHK:%.*]] = and i1 poison, poison
+; CHECK-NEXT:    call void (i1, ...) @llvm.experimental.guard(i1 [[WIDE_CHK]]) [ "deopt"() ]
+; CHECK-NEXT:    br label [[BB2:%.*]]
+; CHECK:       bb2:
+; CHECK-NEXT:    br i1 poison, label [[BB3:%.*]], label [[BB2]]
+; CHECK:       bb3:
+; CHECK-NEXT:    [[CALL:%.*]] = call i64 (...) @llvm.experimental.deoptimize.i64() [ "deopt"() ]
+; CHECK-NEXT:    ret i64 [[CALL]]
+;
+bb:
+  call void (i1, ...) @llvm.experimental.guard(i1 poison) [ "deopt"() ]
+  br label %bb2
+
+bb2:                                              ; preds = %bb2, %bb
+  br i1 poison, label %bb3, label %bb2
+
+bb3:                                              ; preds = %bb2
+  call void (i1, ...) @llvm.experimental.guard(i1 poison) [ "deopt"() ]
+  %call = call i64 (...) @llvm.experimental.deoptimize.i64() [ "deopt"() ]
+  ret i64 %call
+}
+
+declare i64 @llvm.experimental.deoptimize.i64(...)
+
+declare void @llvm.experimental.guard(i1, ...)