Swift Calling Convention: add swifterror attribute.

A ``swifterror`` attribute can be applied to a function parameter or an
AllocaInst.

This commit does not include any target-specific change. The target-specific
optimization will come as a follow-up patch.

Differential Revision: http://reviews.llvm.org/D18092

llvm-svn: 265189

1 files changed, 25 insertions, 0 deletions

diff --git a/llvm/test/Bitcode/attributes.ll b/llvm/test/Bitcode/attributes.ll
index 74b0386c33d..dec3608fb2b 100644
--- a/llvm/test/Bitcode/attributes.ll
+++ b/llvm/test/Bitcode/attributes.ll
@@ -293,6 +293,31 @@ define void @f50(i8* swiftself)
   ret void;
 }
 
+; CHECK: define i32 @f51(i8** swifterror)
+define i32 @f51(i8** swifterror)
+{
+  ret i32 0
+}
+
+; CHECK: define i32 @f52(i32, i8** swifterror)
+define i32 @f52(i32, i8** swifterror)
+{
+  ret i32 0
+}
+
+%swift_error = type {i64, i8}
+declare float @foo(%swift_error** swifterror %error_ptr_ref)
+
+; CHECK: define float @f53
+; CHECK: alloca swifterror
+define float @f53(i8* %error_ref) {
+entry:
+  %error_ptr_ref = alloca swifterror %swift_error*
+  store %swift_error* null, %swift_error** %error_ptr_ref
+  %call = call float @foo(%swift_error** swifterror %error_ptr_ref)
+  ret float 1.0
+}
+
 ; CHECK: attributes #0 = { noreturn }
 ; CHECK: attributes #1 = { nounwind }
 ; CHECK: attributes #2 = { readnone }