llvm/test/CodeGen/AArch64/sme-shared-za-interface.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sme -verify-machineinstrs < %s | FileCheck %s

declare void @private_za_callee()

; Ensure that we don't use tail call optimization when a lazy-save is required.
define void @disable_tailcallopt() "aarch64_inout_za" nounwind {
; CHECK-LABEL: disable_tailcallopt:
; CHECK:       // %bb.0:
; CHECK-NEXT:    stp x29, x30, [sp, #-16]! // 16-byte Folded Spill
; CHECK-NEXT:    mov x29, sp
; CHECK-NEXT:    sub sp, sp, #16
; CHECK-NEXT:    rdsvl x8, #1
; CHECK-NEXT:    mov x9, sp
; CHECK-NEXT:    msub x9, x8, x8, x9
; CHECK-NEXT:    mov sp, x9
; CHECK-NEXT:    sub x10, x29, #16
; CHECK-NEXT:    stp x9, x8, [x29, #-16]
; CHECK-NEXT:    msr TPIDR2_EL0, x10
; CHECK-NEXT:    bl private_za_callee
; CHECK-NEXT:    smstart za
; CHECK-NEXT:    mrs x8, TPIDR2_EL0
; CHECK-NEXT:    sub x0, x29, #16
; CHECK-NEXT:    cbnz x8, .LBB0_2
; CHECK-NEXT:  // %bb.1:
; CHECK-NEXT:    bl __arm_tpidr2_restore
; CHECK-NEXT:  .LBB0_2:
; CHECK-NEXT:    msr TPIDR2_EL0, xzr
; CHECK-NEXT:    mov sp, x29
; CHECK-NEXT:    ldp x29, x30, [sp], #16 // 16-byte Folded Reload
; CHECK-NEXT:    ret
  tail call void @private_za_callee()
  ret void
}

; Ensure we set up and restore the lazy save correctly for instructions which are lowered to lib calls
define fp128 @f128_call_za(fp128 %a, fp128 %b) "aarch64_inout_za" nounwind {
; CHECK-LABEL: f128_call_za:
; CHECK:       // %bb.0:
; CHECK-NEXT:    stp x29, x30, [sp, #-16]! // 16-byte Folded Spill
; CHECK-NEXT:    mov x29, sp
; CHECK-NEXT:    sub sp, sp, #16
; CHECK-NEXT:    rdsvl x8, #1
; CHECK-NEXT:    mov x9, sp
; CHECK-NEXT:    msub x9, x8, x8, x9
; CHECK-NEXT:    mov sp, x9
; CHECK-NEXT:    sub x10, x29, #16
; CHECK-NEXT:    stp x9, x8, [x29, #-16]
; CHECK-NEXT:    msr TPIDR2_EL0, x10
; CHECK-NEXT:    bl __addtf3
; CHECK-NEXT:    smstart za
; CHECK-NEXT:    mrs x8, TPIDR2_EL0
; CHECK-NEXT:    sub x0, x29, #16
; CHECK-NEXT:    cbnz x8, .LBB1_2
; CHECK-NEXT:  // %bb.1:
; CHECK-NEXT:    bl __arm_tpidr2_restore
; CHECK-NEXT:  .LBB1_2:
; CHECK-NEXT:    msr TPIDR2_EL0, xzr
; CHECK-NEXT:    mov sp, x29
; CHECK-NEXT:    ldp x29, x30, [sp], #16 // 16-byte Folded Reload
; CHECK-NEXT:    ret
  %res = fadd fp128 %a, %b
  ret fp128 %res
}