Do early taildup of ret in CodeGenPrepare for potential tail calls that have a

void return type. This fixes PR9487.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128197 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 37 insertions, 0 deletions

diff --git a/test/CodeGen/X86/tailcall-returndup-void.ll b/test/CodeGen/X86/tailcall-returndup-void.ll
new file mode 100644
index 0000000..c1d6312
--- /dev/null
+++ b/test/CodeGen/X86/tailcall-returndup-void.ll
@@ -0,0 +1,37 @@
+; RUN: llc < %s -march=x86-64 | FileCheck %s
+; CHECK: rBM_info
+; CHECK-NOT: ret
+
+@sES_closure = external global [0 x i64]
+declare cc10 void @sEH_info(i64* noalias nocapture, i64* noalias nocapture, i64* noalias nocapture, i64, i64, i64) align 8
+
+define cc10 void @rBM_info(i64* noalias nocapture %Base_Arg, i64* noalias nocapture %Sp_Arg, i64* noalias nocapture %Hp_Arg, i64 %R1_Arg, i64 %R2_Arg, i64 %R3_Arg) nounwind align 8 {
+c263:
+  %ln265 = getelementptr inbounds i64* %Sp_Arg, i64 -2
+  %ln266 = ptrtoint i64* %ln265 to i64
+  %ln268 = icmp ult i64 %ln266, %R3_Arg
+  br i1 %ln268, label %c26a, label %n26p
+
+n26p:                                             ; preds = %c263
+  br i1 icmp ne (i64 and (i64 ptrtoint ([0 x i64]* @sES_closure to i64), i64 7), i64 0), label %c1ZP.i, label %n1ZQ.i
+
+n1ZQ.i:                                           ; preds = %n26p
+  %ln1ZT.i = load i64* getelementptr inbounds ([0 x i64]* @sES_closure, i64 0, i64 0), align 8
+  %ln1ZU.i = inttoptr i64 %ln1ZT.i to void (i64*, i64*, i64*, i64, i64, i64)*
+  tail call cc10 void %ln1ZU.i(i64* %Base_Arg, i64* %Sp_Arg, i64* %Hp_Arg, i64 ptrtoint ([0 x i64]* @sES_closure to i64), i64 ptrtoint ([0 x i64]* @sES_closure to i64), i64 %R3_Arg) nounwind
+  br label %rBL_info.exit
+
+c1ZP.i:                                           ; preds = %n26p
+  tail call cc10 void @sEH_info(i64* %Base_Arg, i64* %Sp_Arg, i64* %Hp_Arg, i64 ptrtoint ([0 x i64]* @sES_closure to i64), i64 ptrtoint ([0 x i64]* @sES_closure to i64), i64 %R3_Arg) nounwind
+  br label %rBL_info.exit
+
+rBL_info.exit:                                    ; preds = %c1ZP.i, %n1ZQ.i
+  ret void
+
+c26a:                                             ; preds = %c263
+  %ln27h = getelementptr inbounds i64* %Base_Arg, i64 -2
+  %ln27j = load i64* %ln27h, align 8
+  %ln27k = inttoptr i64 %ln27j to void (i64*, i64*, i64*, i64, i64, i64)*
+  tail call cc10 void %ln27k(i64* %Base_Arg, i64* %Sp_Arg, i64* %Hp_Arg, i64 %R1_Arg, i64 %R2_Arg, i64 %R3_Arg) nounwind
+  ret void
+}