AMDGPU: Only break soft clauses if xnack enabled

lib/Target/AMDGPU/SIInsertWaits.cpp

for (unsigned j = Interval.first; j < Interval.second; ++j) {
         DefinedRegs[j] = Limit;
 
       // and which one we are using
       if (Op.isUse())
         UsedRegs[j] = Limit;
     }
   }
 
-  if (ST->hasSoftClauses()) {
+  if (ST->hasSoftClauses() && ST->isXNACKEnabled()) {
     if (TII->isSMRD(*I))
       LastOpcodeType = SMEM;
     else if (Increment.Named.VM) {
       if (needToBreakSoftClause(*I)) {
         // Insert a NOP to break the clause.
         BuildMI(MBB, I, DebugLoc(), TII->get(AMDGPU::S_NOP))
           .addImm(0);
         LastInstWritesM0 = false;

test/CodeGen/AMDGPU/break-vmem-soft-clauses.mir

-# RUN: llc -march=amdgcn -mcpu=fiji -verify-machineinstrs -run-pass si-insert-waits %s -o - | FileCheck -check-prefix=GCN -check-prefix=VI %s
+# RUN: llc -march=amdgcn -mcpu=carrizo -verify-machineinstrs -run-pass si-insert-waits %s -o - | FileCheck -check-prefix=GCN -check-prefix=XNACK %s
+# RUN: llc -march=amdgcn -mcpu=fiji -verify-machineinstrs -run-pass si-insert-waits %s -o - | FileCheck -check-prefix=GCN -check-prefix=NOXNACK %s
 
 --- |
   define void @trivial_clause_load_flat4_x1() {
     ret void
   }
 
   define void @trivial_clause_load_flat4_x2() {
     ret void
bb.0:
     %vgpr0 = FLAT_LOAD_DWORD %vgpr2_vgpr3, 0, 0, 0, implicit %exec, implicit %flat_scr
     %sgpr0 = S_MOV_B32 %sgpr0, implicit %vgpr2, implicit %vgpr3, implicit %vgpr4, implicit %vgpr5, implicit %vgpr6, implicit %vgpr7, implicit %vgpr8, implicit %vgpr9, implicit %vgpr10, implicit %vgpr11, implicit %vgpr12, implicit %vgpr13, implicit %vgpr14, implicit %vgpr15, implicit %vgpr16, implicit %vgpr17, implicit %vgpr18
     S_ENDPGM
 ...
 ---
 
 # GCN-LABEL: name: break_clause_simple_load_flat4_lo_ptr
 # GCN: %vgpr0 = FLAT_LOAD_DWORD %vgpr2_vgpr3
-# GCN-NEXT: S_NOP 0
+# XNACK-NEXT: S_NOP 0
 # GCN-NEXT: %vgpr2 = FLAT_LOAD_DWORD %vgpr4_vgpr5
 name: break_clause_simple_load_flat4_lo_ptr
 
 body: |
   bb.0:
     %vgpr0 = FLAT_LOAD_DWORD %vgpr2_vgpr3, 0, 0, 0, implicit %exec, implicit %flat_scr
     %vgpr2 = FLAT_LOAD_DWORD %vgpr4_vgpr5, 0, 0, 0, implicit %exec, implicit %flat_scr
     S_ENDPGM
 ...
 ---
 
 # GCN-LABEL: name: break_clause_simple_load_flat4_hi_ptr
 # GCN: %vgpr0 = FLAT_LOAD_DWORD %vgpr2_vgpr3
-# GCN-NEXT: S_NOP 0
+# XNACK-NEXT: S_NOP 0
 # GCN-NEXT: %vgpr3 = FLAT_LOAD_DWORD %vgpr4_vgpr5
 name: break_clause_simple_load_flat4_hi_ptr
 
 body: |
   bb.0:
     %vgpr0 = FLAT_LOAD_DWORD %vgpr2_vgpr3, 0, 0, 0, implicit %exec, implicit %flat_scr
     %vgpr3 = FLAT_LOAD_DWORD %vgpr4_vgpr5, 0, 0, 0, implicit %exec, implicit %flat_scr
     S_ENDPGM
 ...
 ---
 
 # GCN-LABEL: name: break_clause_simple_load_flat8_ptr
 # GCN: %vgpr0_vgpr1 = FLAT_LOAD_DWORDX2 %vgpr2_vgpr3, 0, 0, 0, implicit %exec, implicit %flat_scr
-# GCN-NEXT: S_NOP 0
+# XNACK-NEXT: S_NOP 0
 # GCN-NEXT: %vgpr2_vgpr3 = FLAT_LOAD_DWORDX2 %vgpr4_vgpr5, 0, 0, 0, implicit %exec, implicit %flat_scr
 name: break_clause_simple_load_flat8_ptr
 
 body: |
   bb.0:
     %vgpr0_vgpr1 = FLAT_LOAD_DWORDX2 %vgpr2_vgpr3, 0, 0, 0, implicit %exec, implicit %flat_scr
     %vgpr2_vgpr3 = FLAT_LOAD_DWORDX2 %vgpr4_vgpr5, 0, 0, 0, implicit %exec, implicit %flat_scr
     S_ENDPGM
 ...
 ---
 
 # GCN-LABEL: name: break_clause_simple_load_flat16_ptr
 # GCN: %vgpr0_vgpr1 = FLAT_LOAD_DWORDX2 %vgpr2_vgpr3
-# GCN-NEXT: S_NOP 0
+# XNACK-NEXT: S_NOP 0
 # GCN-NEXT: %vgpr2_vgpr3_vgpr4_vgpr5 = FLAT_LOAD_DWORDX4 %vgpr6_vgpr7
 
 name: break_clause_simple_load_flat16_ptr
 
 body: |
   bb.0:
     %vgpr0_vgpr1 = FLAT_LOAD_DWORDX2 %vgpr2_vgpr3, 0, 0, 0, implicit %exec, implicit %flat_scr
     %vgpr2_vgpr3_vgpr4_vgpr5 = FLAT_LOAD_DWORDX4 %vgpr6_vgpr7, 0, 0, 0, implicit %exec, implicit %flat_scr
bb.0:
     %vgpr1 = BUFFER_LOAD_DWORD_OFFEN %vgpr2, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4, 0, 0, 0, 0, implicit %exec
     %vgpr3 = BUFFER_LOAD_DWORD_OFFEN %vgpr4, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4, 0, 0, 0, 0, implicit %exec
     S_ENDPGM
 ...
 ---
 # GCN-LABEL: name: break_clause_simple_load_mubuf_offen_ptr
 # GCN: bb.0:
 # GCN-NEXT: %vgpr1 = BUFFER_LOAD_DWORD_OFFEN %vgpr2, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4
-# GCN-NEXT: S_NOP 0
+# XNACK-NEXT: S_NOP 0
 # GCN-NEXT: %vgpr2 = BUFFER_LOAD_DWORD_OFFEN %vgpr3, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4
 name: break_clause_simple_load_mubuf_offen_ptr
 
 body: |
   bb.0:
     %vgpr1 = BUFFER_LOAD_DWORD_OFFEN %vgpr2, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4, 0, 0, 0, 0, implicit %exec
     %vgpr2 = BUFFER_LOAD_DWORD_OFFEN %vgpr3, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4, 0, 0, 0, 0, implicit %exec
     S_ENDPGM
bb.0:
     S_ENDPGM
 ...
 ---
 # Break a clause from interference between mubuf and flat instructions
 
 # GCN-LABEL: name: break_clause_flat_load_mubuf_load
 # GCN: bb.0:
 # GCN-NEXT: %vgpr0 = FLAT_LOAD_DWORD %vgpr2_vgpr3, 0, 0, 0, implicit %exec, implicit %flat_scr
-# GCN-NEXT: S_NOP 0
+# XNACK-NEXT: S_NOP 0
 # GCN-NEXT: %vgpr2 = BUFFER_LOAD_DWORD_OFFEN %vgpr1, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4, 0, 0, 0, 0, implicit %exec
 # GCN-NEXT: S_ENDPGM
 name: break_clause_flat_load_mubuf_load
 
 body: |
   bb.0:
     %vgpr0 = FLAT_LOAD_DWORD %vgpr2_vgpr3, 0, 0, 0, implicit %exec, implicit %flat_scr
     %vgpr2 = BUFFER_LOAD_DWORD_OFFEN %vgpr1, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4, 0, 0, 0, 0, implicit %exec
     S_ENDPGM
 ...
 # Break a clause from interference between mubuf and flat instructions
 
 # GCN-LABEL: name: break_clause_mubuf_load_flat_load
 # GCN: bb.0:
 # GCN-NEXT: %vgpr0 = BUFFER_LOAD_DWORD_OFFEN %vgpr1, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4
-# GCN-NEXT: S_NOP 0
+# XNACK-NEXT: S_NOP 0
 # GCN-NEXT: %vgpr1 = FLAT_LOAD_DWORD %vgpr2_vgpr3
 # GCN-NEXT: S_ENDPGM
 name: break_clause_mubuf_load_flat_load
 
 body: |
   bb.0:
     %vgpr0 = BUFFER_LOAD_DWORD_OFFEN %vgpr1, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4, 0, 0, 0, 0, implicit %exec
     %vgpr1 = FLAT_LOAD_DWORD %vgpr2_vgpr3, 0, 0, 0, implicit %exec, implicit %flat_scr
 
     S_ENDPGM
 ...
 ---
 
 # GCN-LABEL: name: break_clause_atomic_rtn_into_ptr_flat4
 # GCN: bb.0:
 # GCN-NEXT: %vgpr2 = FLAT_LOAD_DWORD %vgpr4_vgpr5
-# GCN-NEXT: S_NOP 0
+# XNACK-NEXT: S_NOP 0
 # GCN-NEXT: %vgpr4 = FLAT_ATOMIC_ADD_RTN %vgpr5_vgpr6, %vgpr7
 # GCN-NEXT: S_ENDPGM
 name: break_clause_atomic_rtn_into_ptr_flat4
 
 body: |
   bb.0:
     %vgpr2 = FLAT_LOAD_DWORD %vgpr4_vgpr5, 0, 0, 0, implicit %exec, implicit %flat_scr
     %vgpr4 = FLAT_ATOMIC_ADD_RTN %vgpr5_vgpr6, %vgpr7, 0, 0, implicit %exec, implicit %flat_scr
bb.0:
     %vgpr2 = FLAT_LOAD_DWORD %vgpr3_vgpr4, 0, 0, 0, implicit %exec, implicit %flat_scr
     S_ENDPGM
 ...
 ---
 
 # GCN-LABEL: name: break_clause_atomic_rtn_into_ptr_mubuf4
 # GCN: bb.0:
 # GCN-NEXT: %vgpr1 = BUFFER_LOAD_DWORD_OFFEN %vgpr2, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4
-# GCN-NEXT: S_NOP 0
+# XNACK-NEXT: S_NOP 0
 # GCN-NEXT: %vgpr2 = BUFFER_ATOMIC_ADD_RTN_OFFEN %vgpr2, %vgpr5, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4
 # GCN-NEXT: S_ENDPGM
 name: break_clause_atomic_rtn_into_ptr_mubuf4
 
 body: |
   bb.0:
     %vgpr1 = BUFFER_LOAD_DWORD_OFFEN %vgpr2, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4, 0, 0, 0, 0, implicit %exec
     %vgpr2 = BUFFER_ATOMIC_ADD_RTN_OFFEN %vgpr2, %vgpr5, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4, 0, 0, implicit %exec
     S_ENDPGM
 ...
 ---
 
 # GCN-LABEL: name: break_clause_atomic_nortn_ptr_load_mubuf4
 # GCN: bb.0:
 # GCN-NEXT: BUFFER_ATOMIC_ADD_OFFEN %vgpr0, %vgpr1, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4
-# GCN-NEXT: S_NOP 0
+# XNACK-NEXT: S_NOP 0
 # GCN-NEXT: %vgpr1 = BUFFER_LOAD_DWORD_OFFEN %vgpr2, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4
 # GCN-NEXT: S_ENDPGM
 name: break_clause_atomic_nortn_ptr_load_mubuf4
 
 body: |
   bb.0:
     BUFFER_ATOMIC_ADD_OFFEN %vgpr0, %vgpr1, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4, 0, 0, implicit %exec
     %vgpr1 = BUFFER_LOAD_DWORD_OFFEN %vgpr2, %sgpr0_sgpr1_sgpr2_sgpr3, %sgpr4, 0, 0, 0, 0, implicit %exec