[AMDGPU] Always use s_memtime for readcyclecounter

lib/Target/AMDGPU/SMInstructions.td

 
 defm : SMLoad_Pattern <"S_BUFFER_LOAD_DWORD",     f32>;
 defm : SMLoad_Pattern <"S_BUFFER_LOAD_DWORDX2",   v2f32>;
 defm : SMLoad_Pattern <"S_BUFFER_LOAD_DWORDX4",   v4f32>;
 defm : SMLoad_Pattern <"S_BUFFER_LOAD_DWORDX8",   v8f32>;
 defm : SMLoad_Pattern <"S_BUFFER_LOAD_DWORDX16",  v16f32>;
 } // End let AddedComplexity = 100
 
-let OtherPredicates = [isGFX6GFX7] in {
 def : GCNPat <
   (i64 (readcyclecounter)),
   (S_MEMTIME)
 >;
-}
-
-let OtherPredicates = [isGFX8Plus] in {
-
-def : GCNPat <
-  (i64 (readcyclecounter)),
-  (S_MEMREALTIME)
->;
-
-} // let OtherPredicates = [isGFX8Plus]
 
 //===----------------------------------------------------------------------===//
 // GFX10.
 //===----------------------------------------------------------------------===//
 
 class SMEM_Real_gfx10<bits<8> op, SM_Pseudo ps> :
     SM_Real<ps>, SIMCInstr<ps.PseudoInstr, SIEncodingFamily.GFX10>, Enc64 {
   bit glc;

test/CodeGen/AMDGPU/readcyclecounter.ll

-; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=GCN %s
-; RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck -check-prefix=VI -check-prefix=GCN %s
+; RUN: llc -march=amdgcn -mcpu=tahiti -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefix=MEMTIME -check-prefix=SIVI -check-prefix=GCN %s
+; RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefix=MEMTIME -check-prefix=SIVI -check-prefix=GCN %s
+; RUN: llc -march=amdgcn -mcpu=gfx1010 -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefix=MEMTIME -check-prefix=GCN %s
 
 declare i64 @llvm.readcyclecounter() #0
 
 ; GCN-LABEL: {{^}}test_readcyclecounter:
-; SI-DAG: s_memtime s{{\[[0-9]+:[0-9]+\]}}
-; VI-DAG: s_memrealtime s{{\[[0-9]+:[0-9]+\]}}
-; GCN-DAG: s_load_dwordx2
-; GCN: lgkmcnt
-; GCN: store_dwordx2
-; GCN-NOT: lgkmcnt
-; SI: s_memtime s{{\[[0-9]+:[0-9]+\]}}
-; VI: s_memrealtime s{{\[[0-9]+:[0-9]+\]}}
-; GCN: store_dwordx2
+; MEMTIME-DAG: s_memtime s{{\[[0-9]+:[0-9]+\]}}
+; GCN-DAG:     s_load_dwordx2
+; GCN-DAG:     lgkmcnt
+; MEMTIME:     store_dwordx2
+; SIVI-NOT:    lgkmcnt
+; MEMTIME:     s_memtime s{{\[[0-9]+:[0-9]+\]}}
+; MEMTIME:     store_dwordx2
+
 define amdgpu_kernel void @test_readcyclecounter(i64 addrspace(1)* %out) #0 {
   %cycle0 = call i64 @llvm.readcyclecounter()
   store volatile i64 %cycle0, i64 addrspace(1)* %out
 
   %cycle1 = call i64 @llvm.readcyclecounter()
   store volatile i64 %cycle1, i64 addrspace(1)* %out
   ret void
 }
 
 ; This test used to crash in ScheduleDAG.
 ;
 ; GCN-LABEL: {{^}}test_readcyclecounter_smem:
-; SI-DAG: s_memtime
-; VI-DAG: s_memrealtime
-; GCN-DAG: s_load_dword
+; MEMTIME-DAG: s_memtime
+; GCN-DAG:     s_load_dword
 define amdgpu_cs i32 @test_readcyclecounter_smem(i64 addrspace(4)* inreg %in) #0 {
   %cycle0 = call i64 @llvm.readcyclecounter()
   %in.v = load i64, i64 addrspace(4)* %in
   %r.64 = add i64 %cycle0, %in.v
   %r.32 = trunc i64 %r.64 to i32
   ret i32 %r.32
 }
 
 attributes #0 = { nounwind }