// to the saved value before the tail call, which would clobber a call address.
// Note, getMinimalPhysRegClass(R0) returns tGPR because of the names of
// this class and the preceding one(!) This is what we want.
-def tcGPR : RegisterClass<"ARM", [i32], 32, (add R0, R1, R2, R3, R9, R12)> {
+def tcGPR : RegisterClass<"ARM", [i32], 32, (add R0, R1, R2, R3, R12)> {
let AltOrders = [(and tcGPR, tGPR)];
let AltOrderSelect = [{
return MF.getTarget().getSubtarget<ARMSubtarget>().isThumb1Only();
--- /dev/null
+; RUN: llc < %s -mtriple=thumbv7-apple-ios -mcpu=cortex-m3 | FileCheck %s
+
+@foo = common global void ()* null, align 4
+
+; Make sure in the presence of a tail call, r9 doesn't get used to hold
+; the destination address. It's callee-saved in AAPCS.
+define arm_aapcscc void @test(i32 %a) nounwind {
+; CHECK-LABEL: test:
+; CHECK-NOT bx r9
+ %tmp = load void ()** @foo, align 4
+ tail call void asm sideeffect "", "~{r0},~{r1},~{r2},~{r3},~{r12}"() nounwind
+ tail call arm_aapcscc void %tmp() nounwind
+ ret void
+}