llvm/test/CodeGen/ARM/special-reg.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc < %s -mtriple=arm-none-eabi -mcpu=cortex-a8 2>&1 | FileCheck %s --check-prefix=ARM --check-prefix=ACORE
; RUN: llc < %s -mtriple=thumb-none-eabi -mcpu=cortex-m4 2>&1 | FileCheck %s --check-prefix=ARM --check-prefix=MCORE

define i32 @read_i32_encoded_register() nounwind {
; ARM-LABEL: read_i32_encoded_register:
; ARM:       @ %bb.0: @ %entry
; ARM-NEXT:    mrc p1, #2, r0, c3, c4, #5
; ARM-NEXT:    bx lr
entry:
  %reg = call i32 @llvm.read_register.i32(metadata !0)
  ret i32 %reg
}

define i64 @read_i64_encoded_register() nounwind {
; ARM-LABEL: read_i64_encoded_register:
; ARM:       @ %bb.0: @ %entry
; ARM-NEXT:    mrrc p1, #2, r0, r1, c3
; ARM-NEXT:    bx lr
entry:
  %reg = call i64 @llvm.read_register.i64(metadata !1)
  ret i64 %reg
}

define i64 @read_volatile_i64_twice() {
; ACORE-LABEL: read_volatile_i64_twice:
; ACORE:       @ %bb.0: @ %entry
; ACORE-NEXT:    mrrc p15, #1, r0, r1, c14
; ACORE-NEXT:    mrrc p15, #1, r2, r3, c14
; ACORE-NEXT:    eor r0, r2, r0
; ACORE-NEXT:    eor r1, r3, r1
; ACORE-NEXT:    bx lr
;
; MCORE-LABEL: read_volatile_i64_twice:
; MCORE:       @ %bb.0: @ %entry
; MCORE-NEXT:    mrrc p15, #1, r0, r1, c14
; MCORE-NEXT:    mrrc p15, #1, r2, r3, c14
; MCORE-NEXT:    eors r0, r2
; MCORE-NEXT:    eors r1, r3
; MCORE-NEXT:    bx lr
entry:
  %0 = tail call i64 @llvm.read_volatile_register.i64(metadata !5)
  %1 = tail call i64 @llvm.read_volatile_register.i64(metadata !5)
  %xor = xor i64 %1, %0
  ret i64 %xor
}


define i32 @read_apsr() nounwind {
; ARM-LABEL: read_apsr:
; ARM:       @ %bb.0: @ %entry
; ARM-NEXT:    mrs r0, apsr
; ARM-NEXT:    bx lr
entry:
  %reg = call i32 @llvm.read_register.i32(metadata !2)
  ret i32 %reg
}

define i32 @read_fpscr() nounwind {
; ARM-LABEL: read_fpscr:
; ARM:       @ %bb.0: @ %entry
; ARM-NEXT:    vmrs r0, fpscr
; ARM-NEXT:    bx lr
entry:
  %reg = call i32 @llvm.read_register.i32(metadata !3)
  ret i32 %reg
}

define void @write_i32_encoded_register(i32 %x) nounwind {
; ARM-LABEL: write_i32_encoded_register:
; ARM:       @ %bb.0: @ %entry
; ARM-NEXT:    mcr p1, #2, r0, c3, c4, #5
; ARM-NEXT:    bx lr
entry:
  call void @llvm.write_register.i32(metadata !0, i32 %x)
  ret void
}

define void @write_i64_encoded_register(i64 %x) nounwind {
; ARM-LABEL: write_i64_encoded_register:
; ARM:       @ %bb.0: @ %entry
; ARM-NEXT:    mcrr p1, #2, r0, r1, c3
; ARM-NEXT:    bx lr
entry:
  call void @llvm.write_register.i64(metadata !1, i64 %x)
  ret void
}

define void @write_apsr(i32 %x) nounwind {
; ACORE-LABEL: write_apsr:
; ACORE:       @ %bb.0: @ %entry
; ACORE-NEXT:    msr APSR_nzcvq, r0
; ACORE-NEXT:    bx lr
;
; MCORE-LABEL: write_apsr:
; MCORE:       @ %bb.0: @ %entry
; MCORE-NEXT:    msr apsr_nzcvq, r0
; MCORE-NEXT:    bx lr
entry:
  call void @llvm.write_register.i32(metadata !4, i32 %x)
  ret void
}

define void @write_fpscr(i32 %x) nounwind {
; ARM-LABEL: write_fpscr:
; ARM:       @ %bb.0: @ %entry
; ARM-NEXT:    vmsr fpscr, r0
; ARM-NEXT:    bx lr
entry:
  call void @llvm.write_register.i32(metadata !3, i32 %x)
  ret void
}

declare i32 @llvm.read_register.i32(metadata) nounwind
declare i64 @llvm.read_register.i64(metadata) nounwind
declare void @llvm.write_register.i32(metadata, i32) nounwind
declare void @llvm.write_register.i64(metadata, i64) nounwind

!0 = !{!"cp1:2:c3:c4:5"}
!1 = !{!"cp1:2:c3"}
!2 = !{!"apsr"}
!3 = !{!"fpscr"}
!4 = !{!"apsr_nzcvq"}
!5 = !{!"cp15:1:c14"}