xref: /llvm-project/llvm/test/CodeGen/AVR/pseudo/ELPMBRdZ.mir (revision 4fa9dc948226e374372537250d046924d348307e)
1# RUN: llc -mtriple=avr -mattr=+elpm -mattr=+elpmx -start-before=greedy %s -o - \
2# RUN:     | FileCheck %s
3# RUN: llc -mtriple=avr -mattr=+elpm -mattr=-elpmx -start-before=greedy %s -o - \
4# RUN:     | FileCheck --check-prefix=NOX %s
5
6# This test checks the expansion of the 16-bit ELPM pseudo instruction and that
7# the register allocator won't use R31R30 as an output register (which would
8# lead to undefined behavior).
9
10--- |
11  target triple = "avr--"
12  define void @test_elpmbrdz() {
13  entry:
14    ret void
15  }
16...
17
18---
19name:            test_elpmbrdz
20tracksRegLiveness: true
21body: |
22  bb.0.entry:
23    liveins: $r31r30
24
25    ; CHECK-LABEL: test_elpmbrdz
26    ; CHECK:       ; %bb.0:
27    ; CHECK-NEXT:    ldi r24, 1
28    ; CHECK-NEXT:    out
29    ; CHECK-NEXT:    elpm r31, Z
30    ; CHECK-NEXT:    ret
31
32    ; NOX-LABEL:   test_elpmbrdz
33    ; NOX:         ; %bb.0:
34    ; NOX-NEXT:      ldi r24, 1
35    ; NOX-NEXT:      out
36    ; NOX-NEXT:      elpm
37    ; NOX-NEXT:      mov r31, r0
38    ; NOX-NEXT:      ret
39
40    %1:zreg = COPY killed $r31r30
41    %2:ld8 = LDIRdK 1
42    %3:gpr8 = ELPMBRdZ %1, %2, implicit-def dead $r0
43    $r31 = COPY %3
44    RET implicit $r31
45...
46