[SimplifyCFG] Extend SimplifyResume to handle phi of trivial landing pad.
Summary:
This is a fix of D13718. D13718 was committed but then reverted because of the following bug:
https://llvm.org/bugs/show_bug.cgi?id=25299
This patch fixes the issue shown in the bug.
Reviewers: majnemer, reames
Subscribers: jevinskie, llvm-commits
Differential Revision: http://reviews.llvm.org/D14308
llvm-svn: 257277
diff --git a/llvm/test/Transforms/SimplifyCFG/invoke_unwind.ll b/llvm/test/Transforms/SimplifyCFG/invoke_unwind.ll
index 100bfd4..b11b7c1 100644
--- a/llvm/test/Transforms/SimplifyCFG/invoke_unwind.ll
+++ b/llvm/test/Transforms/SimplifyCFG/invoke_unwind.ll
@@ -30,4 +30,46 @@
resume { i8*, i32 } %exn
}
+declare i64 @dummy1()
+declare i64 @dummy2()
+
+; This testcase checks to see if simplifycfg pass can convert two invoke
+; instructions to call instructions if they share a common trivial unwind
+; block.
+define i64 @test3(i1 %cond) personality i32 (...)* @__gxx_personality_v0 {
+entry:
+; CHECK-LABEL: @test3(
+; CHECK: %call1 = call i64 @dummy1()
+; CHECK: %call2 = call i64 @dummy2()
+; CHECK-NOT: resume { i8*, i32 } %lp
+ br i1 %cond, label %br1, label %br2
+
+br1:
+ %call1 = invoke i64 @dummy1()
+ to label %invoke.cont unwind label %lpad1
+
+br2:
+ %call2 = invoke i64 @dummy2()
+ to label %invoke.cont unwind label %lpad2
+
+invoke.cont:
+ %c = phi i64 [%call1, %br1], [%call2, %br2]
+ ret i64 %c
+
+
+lpad1:
+ %0 = landingpad { i8*, i32 }
+ cleanup
+ br label %rethrow
+
+rethrow:
+ %lp = phi { i8*, i32 } [%0, %lpad1], [%1, %lpad2]
+ resume { i8*, i32 } %lp
+
+lpad2:
+ %1 = landingpad { i8*, i32 }
+ cleanup
+ br label %rethrow
+}
+
declare i32 @__gxx_personality_v0(...)