[PowerPC] Add support for -mlongcall
The "long call" option forces the use of the indirect calling sequence for all
calls (even those that don't really need it). GCC provides this option; This is
helpful, under certain circumstances, for building very-large binaries, and
some other specialized use cases.
Fixes PR19098.
llvm-svn: 280040
diff --git a/llvm/test/CodeGen/PowerPC/longcall.ll b/llvm/test/CodeGen/PowerPC/longcall.ll
new file mode 100644
index 0000000..9645ca8
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/longcall.ll
@@ -0,0 +1,26 @@
+; RUN: llc < %s | FileCheck %s
+target datalayout = "E-m:e-i64:64-n32:64"
+target triple = "powerpc64-unknown-linux-gnu"
+
+; Function Attrs: nounwind
+define void @bar() local_unnamed_addr #0 {
+entry:
+ tail call void @foo() #1
+ ret void
+
+; CHECK-LABEL: @bar
+; CHECK: ld [[FD:[0-9]+]], .LC0@toc@l({{[0-9]+}})
+; CHECK: ld [[ADDR:[0-9]+]], 0([[FD]])
+; CHECK: mtctr [[ADDR]]
+; CHECK: bctrl
+; CHECK-NOT: bl foo
+; CHECK: blr
+}
+
+; CHECK: .tc foo
+
+declare void @foo() local_unnamed_addr
+
+attributes #0 = { nounwind "target-cpu"="ppc64" "target-features"="+longcall" }
+attributes #1 = { nounwind }
+