ARM: diagnose deprecated syntax

The use of SP and PC in the register list for stores is deprecated on ARM
(ARM ARM A.8.8.199):

  ARM deprecates the use of ARM instructions that include the SP or the PC in
  the list.

Provide a deprecation warning from the assembler in the case that the syntax is
ever seen.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224319 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMInstrInfo.td

@@ -3167,7 +3167,8 @@ defm LDM : arm_ldst_mult<"ldm", "", 1, 0, LdStMulFrm, IIC_iLoad_m,
 
 let mayStore = 1, hasExtraSrcRegAllocReq = 1 in
 defm STM : arm_ldst_mult<"stm", "", 0, 0, LdStMulFrm, IIC_iStore_m,
-                         IIC_iStore_mu>;
+                         IIC_iStore_mu>,
+           ComplexDeprecationPredicate<"ARMStore">;
 
 } // hasSideEffects
 

lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp

@@ -75,6 +75,20 @@ static bool getITDeprecationInfo(MCInst &MI, MCSubtargetInfo &STI,
   return false;
 }
 
+static bool getARMStoreDeprecationInfo(MCInst &MI, MCSubtargetInfo &STI,
+                                       std::string &Info) {
+  assert(MI.getNumOperands() > 4 && "expected >4 arguments");
+  for (unsigned OI = 4, OE = MI.getNumOperands(); OI < OE; ++OI) {
+    assert(MI.getOperand(OI).isReg() && "expected register");
+    if (MI.getOperand(OI).getReg() == ARM::SP ||
+        MI.getOperand(OI).getReg() == ARM::PC) {
+      Info = "use of SP or PC in the list is deprecated";
+      return true;
+    }
+  }
+  return false;
+}
+
 #define GET_INSTRINFO_MC_DESC
 #include "ARMGenInstrInfo.inc"
 

test/MC/ARM/arm-store-deprecated.s

@@ -0,0 +1,147 @@
+@ RUN: llvm-mc -triple armv7-linux-eabi -filetype asm -o /dev/null %s 2>&1 \
+@ RUN:   | FileCheck %s
+
+	.syntax unified
+	.arm
+
+	.global stm
+	.type stm,%function
+stm:
+	stm sp!, {r0, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stm sp!, {r0, pc}
+@ CHECK: ^
+	stm r0!, {r0, sp}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stm r0!, {r0, sp}
+@ CHECK: ^
+	stm r1!, {r0, sp, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stm r1!, {r0, sp, pc}
+@ CHECK: ^
+	stm r2!, {sp, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stm r2!, {sp, pc}
+@ CHECK: ^
+	stm sp!, {pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stm sp!, {pc}
+@ CHECK: ^
+	stm r0!, {sp}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stm r0!, {sp}
+@ CHECK: ^
+
+	.global stmda
+	.type stmda,%function
+stmda:
+	stmda sp!, {r0, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmda sp!, {r0, pc}
+@ CHECK: ^
+	stmda r0!, {r0, sp}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmda r0!, {r0, sp}
+@ CHECK: ^
+	stmda r1!, {r0, sp, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmda r1!, {r0, sp, pc}
+@ CHECK: ^
+	stmda r2!, {sp, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmda r2!, {sp, pc}
+@ CHECK: ^
+	stmda sp!, {pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmda sp!, {pc}
+@ CHECK: ^
+	stmda r0!, {sp}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmda r0!, {sp}
+@ CHECK: ^
+
+	.global stmdb
+	.type stmdb,%function
+stmdb:
+	stmdb sp!, {r0, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmdb sp!, {r0, pc}
+@ CHECK: ^
+	stmdb r0!, {r0, sp}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmdb r0!, {r0, sp}
+@ CHECK: ^
+	stmdb r1!, {r0, sp, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmdb r1!, {r0, sp, pc}
+@ CHECK: ^
+	stmdb r2!, {sp, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmdb r2!, {sp, pc}
+@ CHECK: ^
+	stmdb sp!, {pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmdb sp!, {pc}
+@ CHECK: ^
+	stmdb r0!, {sp}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmdb r0!, {sp}
+@ CHECK: ^
+
+	.global stmib
+	.type stmib,%function
+stmib:
+	stmib sp!, {r0, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmib sp!, {r0, pc}
+@ CHECK: ^
+	stmib r0!, {r0, sp}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmib r0!, {r0, sp}
+@ CHECK: ^
+	stmib r1!, {r0, sp, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmib r1!, {r0, sp, pc}
+@ CHECK: ^
+	stmib r2!, {sp, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmib r2!, {sp, pc}
+@ CHECK: ^
+	stmib sp!, {pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmib sp!, {pc}
+@ CHECK: ^
+	stmib r0!, {sp}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: stmib r0!, {sp}
+@ CHECK: ^
+
+
+	.global push
+	.type push,%function
+push:
+	push {r0, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: push {r0, pc}
+@ CHECK: ^
+	push {r0, sp}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: push {r0, sp}
+@ CHECK: ^
+	push {r0, sp, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: push {r0, sp, pc}
+@ CHECK: ^
+	push {sp, pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: push {sp, pc}
+@ CHECK: ^
+	push {pc}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: push {pc}
+@ CHECK: ^
+	push {sp}
+@ CHECK: warning: use of SP or PC in the list is deprecated
+@ CHECK: push {sp}
+@ CHECK: ^
+