[GlobalISel][AArch64] Check caller for swifterror params in tailcall eligibility

Before, we only checked the callee for swifterror. However, we should also be
checking the caller to see if it has a swifterror parameter.

Since we don't currently handle outgoing arguments, this didn't show up in the
swifterror.ll testcase.

Also, remove the swifterror checks from call-translator-tail-call.ll, since
they are covered by the existing swifterror testing. Better to have it all in
one place.

Differential Revision: https://reviews.llvm.org/D67465

llvm-svn: 371692

1 files changed, 7 insertions, 3 deletions

diff --git a/llvm/lib/Target/AArch64/AArch64CallLowering.cpp b/llvm/lib/Target/AArch64/AArch64CallLowering.cpp
index 77944186c45..1ca89ba33a5 100644
--- a/llvm/lib/Target/AArch64/AArch64CallLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64CallLowering.cpp
@@ -493,11 +493,15 @@ bool AArch64CallLowering::isEligibleForTailCallOptimization(
   // caller has an argument with "inreg" attribute.
   //
   // FIXME: Check whether the callee also has an "inreg" argument.
+  //
+  // When the caller has a swifterror argument, we don't want to tail call
+  // because would have to move into the swifterror register before the
+  // tail call.
   if (any_of(CallerF.args(), [](const Argument &A) {
-        return A.hasByValAttr() || A.hasInRegAttr();
+        return A.hasByValAttr() || A.hasInRegAttr() || A.hasSwiftErrorAttr();
       })) {
-    LLVM_DEBUG(dbgs() << "... Cannot tail call from callers with byval or "
-                         "inreg arguments.\n");
+    LLVM_DEBUG(dbgs() << "... Cannot tail call from callers with byval, "
+                         "inreg, or swifterror arguments\n");
     return false;
   }