MVT LocVT, CCValAssign::LocInfo LocInfo,
ISD::ArgFlagsTy ArgFlags, CCState &State) {
if (LocVT == MVT::i32 || LocVT == MVT::f32) {
- if (unsigned Reg = State.AllocateReg(Hexagon::R0)) {
+ // Note that use of registers beyond R1 is not ABI compliant. However there
+ // are (experimental) IR passes which generate internal functions that
+ // return structs using these additional registers.
+ static const uint16_t RegList[] = { Hexagon::R0, Hexagon::R1,
+ Hexagon::R2, Hexagon::R3,
+ Hexagon::R4, Hexagon::R5};
+ if (unsigned Reg = State.AllocateReg(RegList)) {
State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
return false;
}
--- /dev/null
+; RUN: llc -march=hexagon < %s | FileCheck %s
+; CHECK: r0 = add(r0, r1)
+
+; Allow simple structures to be returned by value.
+
+%s = type { i32, i32 }
+
+declare %s @foo() #0
+
+define i32 @fred() #0 {
+ %t0 = call %s @foo()
+ %x = extractvalue %s %t0, 0
+ %y = extractvalue %s %t0, 1
+ %r = add i32 %x, %y
+ ret i32 %r
+}
+
+attributes #0 = { nounwind }