Deduplicate ARM call-related instructions.

We had special instructions for iOS because r9 is call-clobbered, but
that is represented dynamically by the register mask operands now, so
there is no need for the pseudo-instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154144 91177308-0d34-0410-b5e6-96231b3b80d8

6 files changed, 24 insertions, 145 deletions

diff --git a/lib/Target/ARM/ARMAsmPrinter.cpp b/lib/Target/ARM/ARMAsmPrinter.cpp
index ee31c0c027..18ff37332a 100644
--- a/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -1266,7 +1266,6 @@ void ARMAsmPrinter::EmitInstruction(const MachineInstr *MI) {
   }
   // Darwin call instructions are just normal call instructions with different
   // clobber semantics (they clobber R9).
-  case ARM::BXr9_CALL:
   case ARM::BX_CALL: {
     {
       MCInst TmpInst;
@@ -1288,7 +1287,6 @@ void ARMAsmPrinter::EmitInstruction(const MachineInstr *MI) {
     }
     return;
   }
-  case ARM::tBXr9_CALL:
   case ARM::tBX_CALL: {
     {
       MCInst TmpInst;
@@ -1311,7 +1309,6 @@ void ARMAsmPrinter::EmitInstruction(const MachineInstr *MI) {
     }
     return;
   }
-  case ARM::BMOVPCRXr9_CALL:
   case ARM::BMOVPCRX_CALL: {
     {
       MCInst TmpInst;
@@ -1339,7 +1336,6 @@ void ARMAsmPrinter::EmitInstruction(const MachineInstr *MI) {
     }
     return;
   }
-  case ARM::BMOVPCBr9_CALL:
   case ARM::BMOVPCB_CALL: {
     {
       MCInst TmpInst;
@@ -1367,7 +1363,6 @@ void ARMAsmPrinter::EmitInstruction(const MachineInstr *MI) {
     }
     return;
   }
-  case ARM::t2BMOVPCBr9_CALL:
   case ARM::t2BMOVPCB_CALL: {
     {
       MCInst TmpInst;
diff --git a/lib/Target/ARM/ARMCodeEmitter.cpp b/lib/Target/ARM/ARMCodeEmitter.cpp
index e1e62e6de3..32ef345c05 100644
--- a/lib/Target/ARM/ARMCodeEmitter.cpp
+++ b/lib/Target/ARM/ARMCodeEmitter.cpp
@@ -836,9 +836,7 @@ void ARMCodeEmitter::emitPseudoInstruction(const MachineInstr &MI) {
   default:
     llvm_unreachable("ARMCodeEmitter::emitPseudoInstruction");
   case ARM::BX_CALL:
-  case ARM::BMOVPCRX_CALL:
-  case ARM::BXr9_CALL:
-  case ARM::BMOVPCRXr9_CALL: {
+  case ARM::BMOVPCRX_CALL: {
     // First emit mov lr, pc
     unsigned Binary = 0x01a0e00f;
     Binary |= II->getPredicate(&MI) << ARMII::CondShift;
diff --git a/lib/Target/ARM/ARMFastISel.cpp b/lib/Target/ARM/ARMFastISel.cpp
index 2f08b148e1..3dc79c1625 100644
--- a/lib/Target/ARM/ARMFastISel.cpp
+++ b/lib/Target/ARM/ARMFastISel.cpp
@@ -2111,13 +2111,10 @@ bool ARMFastISel::SelectRet(const Instruction *I) {
 }
 
 unsigned ARMFastISel::ARMSelectCallOp(const GlobalValue *GV) {
-
-  // iOS needs the r9 versions of the opcodes.
-  bool isiOS = Subtarget->isTargetIOS();
   if (isThumb2) {
-    return isiOS ? ARM::tBLr9 : ARM::tBL;
+    return ARM::tBL;
   } else  {
-    return isiOS ? ARM::BLr9 : ARM::BL;
+    return ARM::BL;
   }
 }
 
@@ -2176,8 +2173,7 @@ bool ARMFastISel::ARMEmitLibcall(const Instruction *I, RTLIB::Libcall Call) {
   if (!ProcessCallArgs(Args, ArgRegs, ArgVTs, ArgFlags, RegArgs, CC, NumBytes))
     return false;
 
-  // Issue the call, BLr9 for iOS, BL otherwise.
-  // TODO: Turn this into the table of arm call ops.
+  // Issue the call.
   MachineInstrBuilder MIB;
   unsigned CallOpc = ARMSelectCallOp(NULL);
   if (isThumb2)
@@ -2302,8 +2298,7 @@ bool ARMFastISel::SelectCall(const Instruction *I,
   if (!ProcessCallArgs(Args, ArgRegs, ArgVTs, ArgFlags, RegArgs, CC, NumBytes))
     return false;
 
-  // Issue the call, BLr9 for iOS, BL otherwise.
-  // TODO: Turn this into the table of arm call ops.
+  // Issue the call.
   MachineInstrBuilder MIB;
   unsigned CallOpc = ARMSelectCallOp(GV);
   // Explicitly adding the predicate here.
diff --git a/lib/Target/ARM/ARMInstrInfo.td b/lib/Target/ARM/ARMInstrInfo.td
index 65628544ff..e771693590 100644
--- a/lib/Target/ARM/ARMInstrInfo.td
+++ b/lib/Target/ARM/ARMInstrInfo.td
@@ -1908,7 +1908,7 @@ let isCall = 1,
   def BL  : ABXI<0b1011, (outs), (ins bl_target:$func, variable_ops),
                 IIC_Br, "bl\t$func",
                 [(ARMcall tglobaladdr:$func)]>,
-            Requires<[IsARM, IsNotIOS]> {
+            Requires<[IsARM]> {
     let Inst{31-28} = 0b1110;
     bits<24> func;
     let Inst{23-0} = func;
@@ -1918,7 +1918,7 @@ let isCall = 1,
   def BL_pred : ABI<0b1011, (outs), (ins bl_target:$func, variable_ops),
                    IIC_Br, "bl", "\t$func",
                    [(ARMcall_pred tglobaladdr:$func)]>,
-                Requires<[IsARM, IsNotIOS]> {
+                Requires<[IsARM]> {
     bits<24> func;
     let Inst{23-0} = func;
     let DecoderMethod = "DecodeBranchImmInstruction";
@@ -1928,7 +1928,7 @@ let isCall = 1,
   def BLX : AXI<(outs), (ins GPR:$func, variable_ops), BrMiscFrm,
                 IIC_Br, "blx\t$func",
                 [(ARMcall GPR:$func)]>,
-            Requires<[IsARM, HasV5T, IsNotIOS]> {
+            Requires<[IsARM, HasV5T]> {
     bits<4> func;
     let Inst{31-4} = 0b1110000100101111111111110011;
     let Inst{3-0}  = func;
@@ -1937,7 +1937,7 @@ let isCall = 1,
   def BLX_pred : AI<(outs), (ins GPR:$func, variable_ops), BrMiscFrm,
                     IIC_Br, "blx", "\t$func",
                     [(ARMcall_pred GPR:$func)]>,
-                 Requires<[IsARM, HasV5T, IsNotIOS]> {
+                 Requires<[IsARM, HasV5T]> {
     bits<4> func;
     let Inst{27-4} = 0b000100101111111111110011;
     let Inst{3-0}  = func;
@@ -1947,67 +1947,19 @@ let isCall = 1,
   // Note: Restrict $func to the tGPR regclass to prevent it being in LR.
   def BX_CALL : ARMPseudoInst<(outs), (ins tGPR:$func, variable_ops),
                    8, IIC_Br, [(ARMcall_nolink tGPR:$func)]>,
-                   Requires<[IsARM, HasV4T, IsNotIOS]>;
+                   Requires<[IsARM, HasV4T]>;
 
   // ARMv4
   def BMOVPCRX_CALL : ARMPseudoInst<(outs), (ins tGPR:$func, variable_ops),
                    8, IIC_Br, [(ARMcall_nolink tGPR:$func)]>,
-                   Requires<[IsARM, NoV4T, IsNotIOS]>;
+                   Requires<[IsARM, NoV4T]>;
 
   // mov lr, pc; b if callee is marked noreturn to avoid confusing the
   // return stack predictor.
   def BMOVPCB_CALL : ARMPseudoInst<(outs),
                                    (ins bl_target:$func, variable_ops),
                                8, IIC_Br, [(ARMcall_nolink tglobaladdr:$func)]>,
-                      Requires<[IsARM, IsNotIOS]>;
-}
-
-let isCall = 1,
-  // On IOS R9 is call-clobbered.
-  // R7 is marked as a use to prevent frame-pointer assignments from being
-  // moved above / below calls.
-  Defs = [LR], Uses = [R7, SP] in {
-  def BLr9  : ARMPseudoExpand<(outs), (ins bl_target:$func, variable_ops),
-                4, IIC_Br,
-                [(ARMcall tglobaladdr:$func)], (BL bl_target:$func)>,
-              Requires<[IsARM, IsIOS]>;
-
-  def BLr9_pred : ARMPseudoExpand<(outs),
-                   (ins bl_target:$func, pred:$p, variable_ops),
-                   4, IIC_Br,
-                   [(ARMcall_pred tglobaladdr:$func)],
-                   (BL_pred bl_target:$func, pred:$p)>,
-                  Requires<[IsARM, IsIOS]>;
-
-  // ARMv5T and above
-  def BLXr9 : ARMPseudoExpand<(outs), (ins GPR:$func, variable_ops),
-                4, IIC_Br,
-                [(ARMcall GPR:$func)],
-                (BLX GPR:$func)>,
-               Requires<[IsARM, HasV5T, IsIOS]>;
-
-  def BLXr9_pred: ARMPseudoExpand<(outs), (ins GPR:$func, pred:$p,variable_ops),
-                4, IIC_Br,
-                [(ARMcall_pred GPR:$func)],
-                (BLX_pred GPR:$func, pred:$p)>,
-                   Requires<[IsARM, HasV5T, IsIOS]>;
-
-  // ARMv4T
-  // Note: Restrict $func to the tGPR regclass to prevent it being in LR.
-  def BXr9_CALL : ARMPseudoInst<(outs), (ins tGPR:$func, variable_ops),
-                  8, IIC_Br, [(ARMcall_nolink tGPR:$func)]>,
-                  Requires<[IsARM, HasV4T, IsIOS]>;
-
-  // ARMv4
-  def BMOVPCRXr9_CALL : ARMPseudoInst<(outs), (ins tGPR:$func, variable_ops),
-                  8, IIC_Br, [(ARMcall_nolink tGPR:$func)]>,
-                  Requires<[IsARM, NoV4T, IsIOS]>;
-
-  // mov lr, pc; b if callee is marked noreturn to avoid confusing the
-  // return stack predictor.
-  def BMOVPCBr9_CALL : ARMPseudoInst<(outs),(ins bl_target:$func, variable_ops),
-                               8, IIC_Br, [(ARMcall_nolink tglobaladdr:$func)]>,
-                        Requires<[IsARM, IsIOS]>;
+                      Requires<[IsARM]>;
 }
 
 let isBranch = 1, isTerminator = 1 in {
@@ -4898,15 +4850,9 @@ def : ARMPat<(ARMtcret (i32 texternalsym:$dst)),
 
 // Direct calls
 def : ARMPat<(ARMcall texternalsym:$func), (BL texternalsym:$func)>,
-      Requires<[IsARM, IsNotIOS]>;
-def : ARMPat<(ARMcall texternalsym:$func), (BLr9 texternalsym:$func)>,
-      Requires<[IsARM, IsIOS]>;
-def : ARMPat<(ARMcall_nolink texternalsym:$func),
-             (BMOVPCB_CALL texternalsym:$func)>,
-      Requires<[IsARM, IsNotIOS]>;
+      Requires<[IsARM]>;
 def : ARMPat<(ARMcall_nolink texternalsym:$func),
-             (BMOVPCBr9_CALL texternalsym:$func)>,
-      Requires<[IsARM, IsIOS]>;
+             (BMOVPCB_CALL texternalsym:$func)>, Requires<[IsARM]>;
 
 // zextload i1 -> zextload i8
 def : ARMPat<(zextloadi1 addrmode_imm12:$addr), (LDRBi12 addrmode_imm12:$addr)>;
diff --git a/lib/Target/ARM/ARMInstrThumb.td b/lib/Target/ARM/ARMInstrThumb.td
index 6c9a55cf64..6c45ccc5ae 100644
--- a/lib/Target/ARM/ARMInstrThumb.td
+++ b/lib/Target/ARM/ARMInstrThumb.td
@@ -416,14 +416,13 @@ let isReturn = 1, isTerminator = 1, isBarrier = 1 in {
 // prevent stack-pointer assignments that appear immediately before calls from
 // potentially appearing dead.
 let isCall = 1,
-  // On non-IOS platforms R9 is callee-saved.
   Defs = [LR], Uses = [SP] in {
   // Also used for Thumb2
   def tBL  : TIx2<0b11110, 0b11, 1,
                   (outs), (ins pred:$p, t_bltarget:$func, variable_ops), IIC_Br,
                   "bl${p}\t$func",
                   [(ARMtcall tglobaladdr:$func)]>,
-             Requires<[IsThumb, IsNotIOS]> {
+             Requires<[IsThumb]> {
     bits<22> func;
     let Inst{26} = func{21};
     let Inst{25-16} = func{20-11};
@@ -437,7 +436,7 @@ let isCall = 1,
                  (outs), (ins pred:$p, t_blxtarget:$func, variable_ops), IIC_Br,
                    "blx${p}\t$func",
                    [(ARMcall tglobaladdr:$func)]>,
-              Requires<[IsThumb, HasV5T, IsNotIOS]> {
+              Requires<[IsThumb, HasV5T]> {
     bits<21> func;
     let Inst{25-16} = func{20-11};
     let Inst{13} = 1;
@@ -450,7 +449,7 @@ let isCall = 1,
   def tBLXr : TI<(outs), (ins pred:$p, GPR:$func, variable_ops), IIC_Br,
                   "blx${p}\t$func",
                   [(ARMtcall GPR:$func)]>,
-              Requires<[IsThumb, HasV5T, IsNotIOS]>,
+              Requires<[IsThumb, HasV5T]>,
               T1Special<{1,1,1,?}> { // A6.2.3 & A8.6.24;
     bits<4> func;
     let Inst{6-3} = func;
@@ -461,37 +460,7 @@ let isCall = 1,
   def tBX_CALL : tPseudoInst<(outs), (ins tGPR:$func, variable_ops),
                   4, IIC_Br,
                   [(ARMcall_nolink tGPR:$func)]>,
-            Requires<[IsThumb, IsThumb1Only, IsNotIOS]>;
-}
-
-let isCall = 1,
-  // On IOS R9 is call-clobbered.
-  // R7 is marked as a use to prevent frame-pointer assignments from being
-  // moved above / below calls.
-  Defs = [LR], Uses = [R7, SP] in {
-  // Also used for Thumb2
-  def tBLr9 : tPseudoExpand<(outs), (ins pred:$p, t_bltarget:$func, variable_ops),
-                          4, IIC_Br, [(ARMtcall tglobaladdr:$func)],
-                          (tBL pred:$p, t_bltarget:$func)>,
-              Requires<[IsThumb, IsIOS]>;
-
-  // ARMv5T and above, also used for Thumb2
-  def tBLXi_r9 : tPseudoExpand<(outs), (ins pred:$p, t_blxtarget:$func, variable_ops),
-                      4, IIC_Br, [(ARMcall tglobaladdr:$func)],
-                      (tBLXi pred:$p, t_blxtarget:$func)>,
-                 Requires<[IsThumb, HasV5T, IsIOS]>;
-
-  // Also used for Thumb2
-  def tBLXr_r9 : tPseudoExpand<(outs), (ins pred:$p, GPR:$func, variable_ops),
-                    2, IIC_Br, [(ARMtcall GPR:$func)],
-                    (tBLXr pred:$p, GPR:$func)>,
-                 Requires<[IsThumb, HasV5T, IsIOS]>;
-
-  // ARMv4T
-  def tBXr9_CALL : tPseudoInst<(outs), (ins tGPR:$func, variable_ops),
-                   4, IIC_Br,
-                   [(ARMcall_nolink tGPR:$func)]>,
-              Requires<[IsThumb, IsThumb1Only, IsIOS]>;
+            Requires<[IsThumb, IsThumb1Only]>;
 }
 
 let isBranch = 1, isTerminator = 1, isBarrier = 1 in {
@@ -1318,20 +1287,14 @@ def : T1Pat<(ARMWrapperJT tjumptable:$dst, imm:$id),
 
 // Direct calls
 def : T1Pat<(ARMtcall texternalsym:$func), (tBL texternalsym:$func)>,
-      Requires<[IsThumb, IsNotIOS]>;
-def : T1Pat<(ARMtcall texternalsym:$func), (tBLr9 texternalsym:$func)>,
-      Requires<[IsThumb, IsIOS]>;
+      Requires<[IsThumb]>;
 
 def : Tv5Pat<(ARMcall texternalsym:$func), (tBLXi texternalsym:$func)>,
-      Requires<[IsThumb, HasV5T, IsNotIOS]>;
-def : Tv5Pat<(ARMcall texternalsym:$func), (tBLXi_r9 texternalsym:$func)>,
-      Requires<[IsThumb, HasV5T, IsIOS]>;
+      Requires<[IsThumb, HasV5T]>;
 
 // Indirect calls to ARM routines
 def : Tv5Pat<(ARMcall GPR:$dst), (tBLXr GPR:$dst)>,
-      Requires<[IsThumb, HasV5T, IsNotIOS]>;
-def : Tv5Pat<(ARMcall GPR:$dst), (tBLXr_r9 GPR:$dst)>,
-      Requires<[IsThumb, HasV5T, IsIOS]>;
+      Requires<[IsThumb, HasV5T]>;
 
 // zextload i1 -> zextload i8
 def : T1Pat<(zextloadi1 t_addrmode_rrs1:$addr),
diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td
index cf1fbfa1ab..424c9324e3 100644
--- a/lib/Target/ARM/ARMInstrThumb2.td
+++ b/lib/Target/ARM/ARMInstrThumb2.td
@@ -3276,37 +3276,19 @@ let isCall = 1, isTerminator = 1, isReturn = 1, isBarrier = 1 in {
                  Requires<[IsThumb2, IsIOS]>;
 }
 
-let isCall = 1,
-  // On non-IOS platforms R9 is callee-saved.
-  Defs = [LR], Uses = [SP] in {
+let isCall = 1, Defs = [LR], Uses = [SP] in {
   // mov lr, pc; b if callee is marked noreturn to avoid confusing the
   // return stack predictor.
   def t2BMOVPCB_CALL : tPseudoInst<(outs),
                                    (ins t_bltarget:$func, variable_ops),
                                6, IIC_Br, [(ARMcall_nolink tglobaladdr:$func)]>,
-                        Requires<[IsThumb, IsNotIOS]>;
-}
-
-let isCall = 1,
-  // On IOS R9 is call-clobbered.
-  // R7 is marked as a use to prevent frame-pointer assignments from being
-  // moved above / below calls.
-  Defs = [LR], Uses = [R7, SP] in {
-  // mov lr, pc; b if callee is marked noreturn to avoid confusing the
-  // return stack predictor.
-  def t2BMOVPCBr9_CALL : tPseudoInst<(outs),
-                                     (ins t_bltarget:$func, variable_ops),
-                               6, IIC_Br, [(ARMcall_nolink tglobaladdr:$func)]>,
-                        Requires<[IsThumb, IsIOS]>;
+                        Requires<[IsThumb]>;
 }
 
 // Direct calls
 def : T2Pat<(ARMcall_nolink texternalsym:$func),
             (t2BMOVPCB_CALL texternalsym:$func)>,
-      Requires<[IsThumb, IsNotIOS]>;
-def : T2Pat<(ARMcall_nolink texternalsym:$func),
-            (t2BMOVPCBr9_CALL texternalsym:$func)>,
-      Requires<[IsThumb, IsIOS]>;
+      Requires<[IsThumb]>;
 
 // IT block
 let Defs = [ITSTATE] in