[AVR] Fix incorrect register state for LDRdPtr

Summary:
LDRdPtr expanded from LDWRdPtr shouldn't define its second operand(SrcReg).
The second operand is its source register.
Add -verify-machineinstrs into command line of testcases can trigger this error.

Reviewers: dylanmckay

Reviewed By: dylanmckay

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D75437

Author: tclin914

llvm/lib/Target/AVR/AVRExpandPseudoInsts.cpp

@@ -597,8 +597,8 @@ bool AVRExpandPseudo::expand<AVR::LDWRdPtr>(Block &MBB, BlockIt MBBI) {
 
   // Load low byte.
   auto MIBLO = buildMI(MBB, MBBI, OpLo)
-    .addReg(CurDstLoReg, RegState::Define)
-    .addReg(SrcReg, RegState::Define);
+                   .addReg(CurDstLoReg, RegState::Define)
+                   .addReg(SrcReg);
 
   // Push low byte onto stack if necessary.
   if (TmpReg)

llvm/test/CodeGen/AVR/PR37143.ll

@@ -1,4 +1,4 @@
-; RUN: llc -mattr=avr6,sram < %s -march=avr | FileCheck %s
+; RUN: llc -mattr=avr6,sram < %s -march=avr -verify-machineinstrs | FileCheck %s
 
 ; CHECK: ld {{r[0-9]+}}, [[PTR:[XYZ]]]
 ; CHECK: ldd {{r[0-9]+}}, [[PTR]]+1

llvm/test/CodeGen/AVR/brind.ll

@@ -1,4 +1,4 @@
-; RUN: llc -mattr=sram,eijmpcall < %s -march=avr | FileCheck %s
+; RUN: llc -mattr=sram,eijmpcall < %s -march=avr -verify-machineinstrs | FileCheck %s
 
 @brind.k = private unnamed_addr constant [2 x i8*] [i8* blockaddress(@brind, %return), i8* blockaddress(@brind, %b)], align 1
 

llvm/test/CodeGen/AVR/load.ll

@@ -1,4 +1,4 @@
-; RUN: llc -mattr=avr6,sram < %s -march=avr | FileCheck %s
+; RUN: llc -mattr=avr6,sram < %s -march=avr -verify-machineinstrs | FileCheck %s
 
 define i8 @load8(i8* %x) {
 ; CHECK-LABEL: load8:

llvm/test/CodeGen/AVR/pseudo/LDWRdPtr.mir

@@ -17,7 +17,7 @@ body: |
 
     ; CHECK-LABEL: test_ldwrdptr
 
-    ; CHECK:      $r0, $r31r30 = LDRdPtr
+    ; CHECK:               $r0 = LDRdPtr $r31r30
     ; CHECK-NEXT:          $r1 = LDDRdPtrQ $r31r30, 1
 
     $r1r0 = LDWRdPtr $r31r30