[llvm] [AMDGPU] Fix SDWA 'preserve' transformation for instructions in different basic blocks. (PR #82406)

[Valery Pykhtin via llvm-commits]

https://github.com/vpykhtin updated https://github.com/llvm/llvm-project/pull/82406

>From d23f860efeae17d3e0bd8d6762291609e69ab23a Mon Sep 17 00:00:00 2001
From: Valery Pykhtin <valery.pykhtin at gmail.com>
Date: Tue, 20 Feb 2024 17:43:42 +0100
Subject: [PATCH] [AMDGPU] Fix SDWA 'preserve' transformation for instructions
 in different basic blocks.

---
 llvm/lib/Target/AMDGPU/SIPeepholeSDWA.cpp  |  7 ++-
 llvm/test/CodeGen/AMDGPU/sdwa-preserve.mir | 57 ++++++++++++++++++++++
 2 files changed, 60 insertions(+), 4 deletions(-)

diff --git a/llvm/lib/Target/AMDGPU/SIPeepholeSDWA.cpp b/llvm/lib/Target/AMDGPU/SIPeepholeSDWA.cpp
index 53fc2c0686245f..afc380b4203457 100644
--- a/llvm/lib/Target/AMDGPU/SIPeepholeSDWA.cpp
+++ b/llvm/lib/Target/AMDGPU/SIPeepholeSDWA.cpp
@@ -472,12 +472,11 @@ bool SDWADstPreserveOperand::convertToSDWA(MachineInstr &MI,
   }
 
   // Move MI before v_or_b32
-  auto MBB = MI.getParent();
-  MBB->remove(&MI);
-  MBB->insert(getParentInst(), &MI);
+  MI.getParent()->remove(&MI);
+  getParentInst()->getParent()->insert(getParentInst(), &MI);
 
   // Add Implicit use of preserved register
-  MachineInstrBuilder MIB(*MBB->getParent(), MI);
+  MachineInstrBuilder MIB(*MI.getMF(), MI);
   MIB.addReg(getPreservedOperand()->getReg(),
              RegState::ImplicitKill,
              getPreservedOperand()->getSubReg());
diff --git a/llvm/test/CodeGen/AMDGPU/sdwa-preserve.mir b/llvm/test/CodeGen/AMDGPU/sdwa-preserve.mir
index f93456ccacb806..4c61e6803febf3 100644
--- a/llvm/test/CodeGen/AMDGPU/sdwa-preserve.mir
+++ b/llvm/test/CodeGen/AMDGPU/sdwa-preserve.mir
@@ -160,3 +160,60 @@ body:             |
     S_ENDPGM 0
 
 ...
+---
+name:            add_f16_u32_preserve_different_bb
+tracksRegLiveness: true
+body:             |
+  ; SDWA-LABEL: name: add_f16_u32_preserve_different_bb
+  ; SDWA: bb.0:
+  ; SDWA-NEXT:   successors: %bb.1(0x80000000)
+  ; SDWA-NEXT:   liveins: $vgpr0_vgpr1, $vgpr2_vgpr3, $sgpr30_sgpr31
+  ; SDWA-NEXT: {{  $}}
+  ; SDWA-NEXT:   [[COPY:%[0-9]+]]:sreg_64 = COPY $sgpr30_sgpr31
+  ; SDWA-NEXT:   [[COPY1:%[0-9]+]]:vreg_64 = COPY $vgpr2_vgpr3
+  ; SDWA-NEXT:   [[COPY2:%[0-9]+]]:vreg_64 = COPY $vgpr0_vgpr1
+  ; SDWA-NEXT:   [[FLAT_LOAD_DWORD:%[0-9]+]]:vgpr_32 = FLAT_LOAD_DWORD [[COPY2]], 0, 0, implicit $exec, implicit $flat_scr :: (load (s32))
+  ; SDWA-NEXT:   [[FLAT_LOAD_DWORD1:%[0-9]+]]:vgpr_32 = FLAT_LOAD_DWORD [[COPY1]], 0, 0, implicit $exec, implicit $flat_scr :: (load (s32))
+  ; SDWA-NEXT:   [[V_AND_B32_e32_:%[0-9]+]]:vgpr_32 = V_AND_B32_e32 65535, [[FLAT_LOAD_DWORD]], implicit $exec
+  ; SDWA-NEXT:   [[V_LSHRREV_B32_e64_:%[0-9]+]]:vgpr_32 = V_LSHRREV_B32_e64 16, [[FLAT_LOAD_DWORD1]], implicit $exec
+  ; SDWA-NEXT:   [[V_BFE_U32_e64_:%[0-9]+]]:vgpr_32 = V_BFE_U32_e64 [[FLAT_LOAD_DWORD]], 8, 8, implicit $exec
+  ; SDWA-NEXT:   [[V_LSHRREV_B32_e32_:%[0-9]+]]:vgpr_32 = V_LSHRREV_B32_e32 24, [[FLAT_LOAD_DWORD1]], implicit $exec
+  ; SDWA-NEXT: {{  $}}
+  ; SDWA-NEXT: bb.1:
+  ; SDWA-NEXT:   successors: %bb.2(0x80000000)
+  ; SDWA-NEXT: {{  $}}
+  ; SDWA-NEXT:   [[V_MUL_F32_sdwa:%[0-9]+]]:vgpr_32 = V_MUL_F32_sdwa 0, [[FLAT_LOAD_DWORD]], 0, [[FLAT_LOAD_DWORD1]], 0, 0, 5, 0, 1, 3, implicit $mode, implicit $exec
+  ; SDWA-NEXT: {{  $}}
+  ; SDWA-NEXT: bb.2:
+  ; SDWA-NEXT:   [[V_ADD_F16_sdwa:%[0-9]+]]:vgpr_32 = V_ADD_F16_sdwa 0, [[FLAT_LOAD_DWORD]], 0, [[FLAT_LOAD_DWORD1]], 0, 0, 1, 2, 4, 5, implicit $mode, implicit $exec, implicit killed [[V_MUL_F32_sdwa]](tied-def 0)
+  ; SDWA-NEXT:   FLAT_STORE_DWORD [[COPY2]], [[V_ADD_F16_sdwa]], 0, 0, implicit $exec, implicit $flat_scr :: (store (s32))
+  ; SDWA-NEXT:   $sgpr30_sgpr31 = COPY [[COPY]]
+  ; SDWA-NEXT:   S_SETPC_B64_return $sgpr30_sgpr31
+  bb.0:
+    liveins: $vgpr0_vgpr1, $vgpr2_vgpr3, $sgpr30_sgpr31
+
+    %2:sreg_64 = COPY $sgpr30_sgpr31
+    %1:vreg_64 = COPY $vgpr2_vgpr3
+    %0:vreg_64 = COPY $vgpr0_vgpr1
+    %3:vgpr_32 = FLAT_LOAD_DWORD %0, 0, 0, implicit $exec, implicit $flat_scr :: (load (s32))
+    %4:vgpr_32 = FLAT_LOAD_DWORD %1, 0, 0, implicit $exec, implicit $flat_scr :: (load (s32))
+
+    %5:vgpr_32 = V_AND_B32_e32 65535, %3, implicit $exec
+    %6:vgpr_32 = V_LSHRREV_B32_e64 16, %4, implicit $exec
+    %7:vgpr_32 = V_BFE_U32_e64 %3, 8, 8, implicit $exec
+    %8:vgpr_32 = V_LSHRREV_B32_e32 24, %4, implicit $exec
+
+    %9:vgpr_32 = V_ADD_F16_e64 0, %5, 0, %6, 0, 0, implicit $mode, implicit $exec
+    %10:vgpr_32 = V_LSHLREV_B16_e64 8, %9, implicit $exec
+
+  bb.1:
+    %11:vgpr_32 = V_MUL_F32_e64 0, %7, 0, %8, 0, 0, implicit $mode, implicit $exec
+    %12:vgpr_32 = V_LSHLREV_B32_e64 16, %11, implicit $exec
+
+  bb.2:
+    %13:vgpr_32 = V_OR_B32_e64 %10, %12, implicit $exec
+
+    FLAT_STORE_DWORD %0, %13, 0, 0, implicit $exec, implicit $flat_scr :: (store (s32))
+    $sgpr30_sgpr31 = COPY %2
+    S_SETPC_B64_return $sgpr30_sgpr31
+...