[AArch64][GlobalISel] Select G_SDIV/G_UDIV.

There is no REM instruction; that will require an expansion.
It's not obvious that should be done in select, rather than as a
(custom?) legalization.

llvm-svn: 279074

llvm/lib/Target/AArch64/AArch64InstructionSelector.cpp

@@ -113,6 +113,10 @@ static unsigned selectBinaryOp(unsigned GenericOpc, unsigned RegBankID,
         return AArch64::LSRVWr;
       case TargetOpcode::G_ASHR:
         return AArch64::ASRVWr;
+      case TargetOpcode::G_SDIV:
+        return AArch64::SDIVWr;
+      case TargetOpcode::G_UDIV:
+        return AArch64::UDIVWr;
       default:
         return GenericOpc;
       }
@@ -134,6 +138,10 @@ static unsigned selectBinaryOp(unsigned GenericOpc, unsigned RegBankID,
         return AArch64::LSRVXr;
       case TargetOpcode::G_ASHR:
         return AArch64::ASRVXr;
+      case TargetOpcode::G_SDIV:
+        return AArch64::SDIVXr;
+      case TargetOpcode::G_UDIV:
+        return AArch64::UDIVXr;
       default:
         return GenericOpc;
       }
@@ -289,6 +297,8 @@ bool AArch64InstructionSelector::select(MachineInstr &I) const {
   case TargetOpcode::G_SHL:
   case TargetOpcode::G_LSHR:
   case TargetOpcode::G_ASHR:
+  case TargetOpcode::G_SDIV:
+  case TargetOpcode::G_UDIV:
   case TargetOpcode::G_ADD:
   case TargetOpcode::G_SUB: {
     // Reject the various things we don't support yet.

llvm/lib/Target/AArch64/AArch64MachineLegalizer.cpp

@@ -42,7 +42,7 @@ AArch64MachineLegalizer::AArch64MachineLegalizer() {
       setAction(BinOp, Ty, WidenScalar);
   }
 
-  for (auto BinOp : {G_SHL, G_LSHR, G_ASHR})
+  for (auto BinOp : {G_SHL, G_LSHR, G_ASHR, G_SDIV, G_UDIV})
     for (auto Ty : {s32, s64})
       setAction(BinOp, Ty, Legal);
 

llvm/test/CodeGen/AArch64/GlobalISel/arm64-instructionselect.mir

@@ -34,6 +34,12 @@
   define void @mul_s32_gpr() { ret void }
   define void @mul_s64_gpr() { ret void }
 
+  define void @sdiv_s32_gpr() { ret void }
+  define void @sdiv_s64_gpr() { ret void }
+
+  define void @udiv_s32_gpr() { ret void }
+  define void @udiv_s64_gpr() { ret void }
+
   define void @unconditional_br() { ret void }
 
   define void @load_s64_gpr(i64* %addr) { ret void }
@@ -592,6 +598,126 @@ body:             |
     %2(64) = G_MUL s64 %0, %1
 ...
 
+---
+# Same as add_s32_gpr, for G_SDIV operations.
+# CHECK-LABEL: name: sdiv_s32_gpr
+name:            sdiv_s32_gpr
+isSSA:           true
+legalized:       true
+regBankSelected: true
+
+# CHECK:      registers:
+# CHECK-NEXT:  - { id: 0, class: gpr32 }
+# CHECK-NEXT:  - { id: 1, class: gpr32 }
+# CHECK-NEXT:  - { id: 2, class: gpr32 }
+registers:
+  - { id: 0, class: gpr }
+  - { id: 1, class: gpr }
+  - { id: 2, class: gpr }
+
+# CHECK:  body:
+# CHECK:    %0 = COPY %w0
+# CHECK:    %1 = COPY %w1
+# CHECK:    %2 = SDIVWr %0, %1
+body:             |
+  bb.0:
+    liveins: %w0, %w1
+
+    %0(32) = COPY %w0
+    %1(32) = COPY %w1
+    %2(32) = G_SDIV s32 %0, %1
+...
+
+---
+# Same as add_s64_gpr, for G_SDIV operations.
+# CHECK-LABEL: name: sdiv_s64_gpr
+name:            sdiv_s64_gpr
+isSSA:           true
+legalized:       true
+regBankSelected: true
+
+# CHECK:      registers:
+# CHECK-NEXT:  - { id: 0, class: gpr64 }
+# CHECK-NEXT:  - { id: 1, class: gpr64 }
+# CHECK-NEXT:  - { id: 2, class: gpr64 }
+registers:
+  - { id: 0, class: gpr }
+  - { id: 1, class: gpr }
+  - { id: 2, class: gpr }
+
+# CHECK:  body:
+# CHECK:    %0 = COPY %x0
+# CHECK:    %1 = COPY %x1
+# CHECK:    %2 = SDIVXr %0, %1
+body:             |
+  bb.0:
+    liveins: %x0, %x1
+
+    %0(64) = COPY %x0
+    %1(64) = COPY %x1
+    %2(64) = G_SDIV s64 %0, %1
+...
+
+---
+# Same as add_s32_gpr, for G_UDIV operations.
+# CHECK-LABEL: name: udiv_s32_gpr
+name:            udiv_s32_gpr
+isSSA:           true
+legalized:       true
+regBankSelected: true
+
+# CHECK:      registers:
+# CHECK-NEXT:  - { id: 0, class: gpr32 }
+# CHECK-NEXT:  - { id: 1, class: gpr32 }
+# CHECK-NEXT:  - { id: 2, class: gpr32 }
+registers:
+  - { id: 0, class: gpr }
+  - { id: 1, class: gpr }
+  - { id: 2, class: gpr }
+
+# CHECK:  body:
+# CHECK:    %0 = COPY %w0
+# CHECK:    %1 = COPY %w1
+# CHECK:    %2 = UDIVWr %0, %1
+body:             |
+  bb.0:
+    liveins: %w0, %w1
+
+    %0(32) = COPY %w0
+    %1(32) = COPY %w1
+    %2(32) = G_UDIV s32 %0, %1
+...
+
+---
+# Same as add_s64_gpr, for G_UDIV operations.
+# CHECK-LABEL: name: udiv_s64_gpr
+name:            udiv_s64_gpr
+isSSA:           true
+legalized:       true
+regBankSelected: true
+
+# CHECK:      registers:
+# CHECK-NEXT:  - { id: 0, class: gpr64 }
+# CHECK-NEXT:  - { id: 1, class: gpr64 }
+# CHECK-NEXT:  - { id: 2, class: gpr64 }
+registers:
+  - { id: 0, class: gpr }
+  - { id: 1, class: gpr }
+  - { id: 2, class: gpr }
+
+# CHECK:  body:
+# CHECK:    %0 = COPY %x0
+# CHECK:    %1 = COPY %x1
+# CHECK:    %2 = UDIVXr %0, %1
+body:             |
+  bb.0:
+    liveins: %x0, %x1
+
+    %0(64) = COPY %x0
+    %1(64) = COPY %x1
+    %2(64) = G_UDIV s64 %0, %1
+...
+
 ---
 # CHECK-LABEL: name: unconditional_br
 name:            unconditional_br