[PowerPC] Make verifier happy after peephole on MMA COPYs (llvm#94321)

Author: Kai Luo

llvm/lib/Target/PowerPC/PPCMIPeephole.cpp

@@ -448,6 +448,9 @@ void PPCMIPeephole::convertUnprimedAccPHIs(
       if (MRI->isSSA())
         addRegToUpdate(RegMBB.first.getReg());
     }
+    // The liveness of old PHI and new PHI have to be updated.
+    addRegToUpdate(PHI->getOperand(0).getReg());
+    addRegToUpdate(AccReg);
     ChangedPHIMap[PHI] = NewPHI.getInstr();
     LLVM_DEBUG(dbgs() << "Converting PHI: ");
     LLVM_DEBUG(PHI->dump());

llvm/test/CodeGen/PowerPC/peephole-mma-phi-liveness.ll

@@ -1,14 +1,43 @@
-;REQUIRES: asserts
-;RUN: not --crash llc -verify-machineinstrs -mtriple=powerpc64-ibm-aix < %s 2>&1 | FileCheck %s
-
-;CHECK: %[[PHI1:[0-9]+]]:accrc = PHI
-;CHECK: %[[PHI0:[0-9]+]]:uaccrc = PHI
-;CHECK: Virtual register %[[PHI0]] is not needed live through the block.
-;CHECK: Virtual register %[[PHI1]] must be live through the block.
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -verify-machineinstrs -mtriple=powerpc64-ibm-aix < %s | FileCheck %s
 
 target datalayout = "E-m:a-Fi64-i64:64-n32:64-S128-v256:256:256-v512:512:512"
 
 define void @baz(i64 %arg) local_unnamed_addr #0 {
+; CHECK-LABEL: baz:
+; CHECK:       # %bb.0: # %bb
+; CHECK-NEXT:    xxmfacc 0
+; CHECK-NEXT:    xxmrgld 0, 0, 2
+; CHECK-NEXT:    xxlxor 1, 1, 1
+; CHECK-NEXT:    xvnegdp 2, 0
+; CHECK-NEXT:    xvnegdp 0, 0
+; CHECK-NEXT:    xvsubdp 2, 2, 1
+; CHECK-NEXT:    xvsubdp 0, 0, 3
+; CHECK-NEXT:    xvmuldp 2, 2, 1
+; CHECK-NEXT:    xvmuldp 0, 0, 1
+; CHECK-NEXT:    xvmaddadp 2, 1, 1
+; CHECK-NEXT:    xvmaddadp 0, 1, 1
+; CHECK-NEXT:    stxv 2, 0(3)
+; CHECK-NEXT:    stxv 0, 0(3)
+; CHECK-NEXT:    # implicit-def: $acc0
+; CHECK-NEXT:    bc 12, 20, L..BB0_2
+; CHECK-NEXT:  # %bb.1: # %bb10
+; CHECK-NEXT:    xvf64gerpp 0, 34, 0
+; CHECK-NEXT:  L..BB0_2: # %bb12
+; CHECK-NEXT:    cmpdi 3, 0
+; CHECK-NEXT:  L..BB0_3: # %bb13
+; CHECK-NEXT:    #
+; CHECK-NEXT:    bc 4, 2, L..BB0_3
+; CHECK-NEXT:  # %bb.4: # %bb14
+; CHECK-NEXT:    xxmfacc 0
+; CHECK-NEXT:    xxlxor 0, 0, 0
+; CHECK-NEXT:    xxlxor 2, 2, 2
+; CHECK-NEXT:    xvsubdp 1, 0, 1
+; CHECK-NEXT:    xvmaddadp 2, 1, 2
+; CHECK-NEXT:    xvadddp 0, 2, 0
+; CHECK-NEXT:    xxswapd 0, 0
+; CHECK-NEXT:    stxv 0, 0(3)
+; CHECK-NEXT:    blr
 bb:
   %call = tail call { <16 x i8>, <16 x i8>, <16 x i8>, <16 x i8> } @llvm.ppc.mma.disassemble.acc(<512 x i1> poison)
   %extractvalue = extractvalue { <16 x i8>, <16 x i8>, <16 x i8>, <16 x i8> } %call, 0