llvm/test/CodeGen/AArch64/sme-new-za-function.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc -O0 -mtriple=aarch64-linux-gnu -mattr=+sme -verify-machineinstrs < %s | FileCheck %s

declare void @shared_za_callee() "aarch64_inout_za"

define void @private_za() "aarch64_new_za" {
; CHECK-LABEL: private_za:
; CHECK:       // %bb.0:
; CHECK-NEXT:    str x30, [sp, #-16]! // 8-byte Folded Spill
; CHECK-NEXT:    .cfi_def_cfa_offset 16
; CHECK-NEXT:    .cfi_offset w30, -16
; CHECK-NEXT:    mrs x8, TPIDR2_EL0
; CHECK-NEXT:    cbnz x8, .LBB0_1
; CHECK-NEXT:    b .LBB0_2
; CHECK-NEXT:  .LBB0_1:
; CHECK-NEXT:    bl __arm_tpidr2_save
; CHECK-NEXT:    msr TPIDR2_EL0, xzr
; CHECK-NEXT:    zero {za}
; CHECK-NEXT:    b .LBB0_2
; CHECK-NEXT:  .LBB0_2:
; CHECK-NEXT:    smstart za
; CHECK-NEXT:    bl shared_za_callee
; CHECK-NEXT:    smstop za
; CHECK-NEXT:    ldr x30, [sp], #16 // 8-byte Folded Reload
; CHECK-NEXT:    ret
  call void @shared_za_callee()
  ret void
}

; Note: This test must run at -O0 as otherwise the multiple exits are optimized out.
define i32 @private_za_multiple_exit(i32 %a, i32 %b, i64 %cond) "aarch64_new_za" {
; CHECK-LABEL: private_za_multiple_exit:
; CHECK:       // %bb.0: // %entry
; CHECK-NEXT:    sub sp, sp, #16
; CHECK-NEXT:    .cfi_def_cfa_offset 16
; CHECK-NEXT:    str w1, [sp, #8] // 4-byte Spill
; CHECK-NEXT:    str w0, [sp, #12] // 4-byte Spill
; CHECK-NEXT:    subs x8, x2, #1
; CHECK-NEXT:    b.ne .LBB1_2
; CHECK-NEXT:    b .LBB1_1
; CHECK-NEXT:  .LBB1_1: // %if.else
; CHECK-NEXT:    ldr w8, [sp, #12] // 4-byte Reload
; CHECK-NEXT:    ldr w9, [sp, #8] // 4-byte Reload
; CHECK-NEXT:    add w0, w8, w9
; CHECK-NEXT:    add sp, sp, #16
; CHECK-NEXT:    ret
; CHECK-NEXT:  .LBB1_2: // %if.end
; CHECK-NEXT:    ldr w8, [sp, #12] // 4-byte Reload
; CHECK-NEXT:    ldr w9, [sp, #8] // 4-byte Reload
; CHECK-NEXT:    subs w0, w8, w9
; CHECK-NEXT:    add sp, sp, #16
; CHECK-NEXT:    ret
entry:
  %tobool = icmp eq i64 %cond, 1
  br i1 %tobool, label %if.else, label %if.end

if.else:
  %add = add i32 %a, %b
  ret i32 %add

if.end:
  %sub = sub i32 %a, %b
  ret i32 %sub
}

; In simple cases like this we should omit all ZA setup.
define i32 @private_za_trivially_does_not_use_za(i32 %x) "aarch64_new_za" {
; CHECK-LABEL: private_za_trivially_does_not_use_za:
; CHECK:       // %bb.0:
; CHECK-NEXT:    add w0, w0, w0
; CHECK-NEXT:    ret
    %ret = add i32 %x, %x
    ret i32 %ret
}