ARM: further improve deprecated diagnosis (LDM)

The ARM ARM states:
  LDM/LDMIA/LDMFD:
    The SP can be in the list. However, ARM deprecates using these instructions
    with SP in the list.

    ARM deprecates using these instructions with both the LR and the PC in the
    list.

  LDMDA/LDMFA/LDMDB/LDMEA/LDMIB/LDMED:
    The SP can be in the list. However, instructions that include the SP in the
    list are deprecated.

    Instructions that include both the LR and the PC in the list are deprecated.

  POP:
    The SP can only be in the list before ARMv7. ARM deprecates any use of ARM
    instructions that include the SP, and the value of the SP after such an
    instruction is UNKNOWN.

    ARM deprecates the use of this instruction with both the LR and the PC in
    the list.

Attempt to diagnose use of deprecated forms of these instructions.  This mirrors
the previous changes to diagnose use of the deprecated forms of STM in ARM mode.

llvm-svn: 224682

3 files changed, 107 insertions, 6 deletions

diff --git a/llvm/lib/Target/ARM/ARMInstrInfo.td b/llvm/lib/Target/ARM/ARMInstrInfo.td
index db58ea8fca2..3d9a1106a83 100644
--- a/llvm/lib/Target/ARM/ARMInstrInfo.td
+++ b/llvm/lib/Target/ARM/ARMInstrInfo.td
@@ -3163,7 +3163,7 @@ let hasSideEffects = 0 in {
 
 let mayLoad = 1, hasExtraDefRegAllocReq = 1 in
 defm LDM : arm_ldst_mult<"ldm", "", 1, 0, LdStMulFrm, IIC_iLoad_m,
-                         IIC_iLoad_mu>;
+                         IIC_iLoad_mu>, ComplexDeprecationPredicate<"ARMLoad">;
 
 let mayStore = 1, hasExtraSrcRegAllocReq = 1 in
 defm STM : arm_ldst_mult<"stm", "", 0, 0, LdStMulFrm, IIC_iStore_m,
diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp b/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
index ecc7f0b1650..2cbc071f74e 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
@@ -92,6 +92,38 @@ static bool getARMStoreDeprecationInfo(MCInst &MI, MCSubtargetInfo &STI,
   return false;
 }
 
+static bool getARMLoadDeprecationInfo(MCInst &MI, MCSubtargetInfo &STI,
+                                      std::string &Info) {
+  if (STI.getFeatureBits() & llvm::ARM::ModeThumb)
+    return false;
+
+  assert(MI.getNumOperands() >= 4 && "expected >= 4 arguments");
+  bool ListContainsPC = false, ListContainsLR = false;
+  for (unsigned OI = 4, OE = MI.getNumOperands(); OI < OE; ++OI) {
+    assert(MI.getOperand(OI).isReg() && "expected register");
+    switch (MI.getOperand(OI).getReg()) {
+    default:
+      break;
+    case ARM::LR:
+      ListContainsLR = true;
+      break;
+    case ARM::PC:
+      ListContainsPC = true;
+      break;
+    case ARM::SP:
+      Info = "use of SP in the list is deprecated";
+      return true;
+    }
+  }
+
+  if (ListContainsPC && ListContainsLR) {
+    Info = "use of LR and PC simultaneously in the list is deprecated";
+    return true;
+  }
+
+  return false;
+}
+
 #define GET_INSTRINFO_MC_DESC
 #include "ARMGenInstrInfo.inc"
 
diff --git a/llvm/test/MC/ARM/arm-store-deprecated.s b/llvm/test/MC/ARM/arm-load-store-multiple-deprecated.s
index 8a598abc424..9354822bc41 100644
--- a/llvm/test/MC/ARM/arm-store-deprecated.s
+++ b/llvm/test/MC/ARM/arm-load-store-multiple-deprecated.s
@@ -1,6 +1,9 @@
-@ RUN: llvm-mc -triple armv7-linux-eabi -filetype asm -o /dev/null %s 2>&1 \
+@ RUN: llvm-mc -triple armv6t2-linux-eabi -filetype asm -o - %s 2>&1 \
 @ RUN:   | FileCheck %s
 
+@ RUN: not llvm-mc -triple armv7-linux-eabi -filetype asm -o - %s 2>&1 \
+@ RUN:   | FileCheck %s -check-prefix CHECK -check-prefix CHECK-V7
+
 	.syntax unified
 	.arm
 
@@ -145,9 +148,75 @@ push:
 @ CHECK: push {sp}
 @ CHECK: ^
 
-	.global single
-	.type single,%function
-single:
+	.global ldm
+	.type ldm,%function
+ldm:
+	ldm r0!, {r1, sp}
+@ CHECK: warning: use of SP in the list is deprecated
+	ldm r0!, {sp}
+@ CHECK: warning: use of SP in the list is deprecated
+	ldm r0!, {r1, lr, pc}
+@ CHECK: warning: use of LR and PC simultaneously in the list is deprecated
+	ldm r0!, {lr, pc}
+@ CHECK: warning: use of LR and PC simultaneously in the list is deprecated
+
+	.global ldmda
+	.type ldmda,%function
+ldmda:
+	ldmda r0!, {r1, sp}
+@ CHECK: warning: use of SP in the list is deprecated
+	ldmda r0!, {sp}
+@ CHECK: warning: use of SP in the list is deprecated
+	ldmda r0!, {r1, lr, pc}
+@ CHECK: warning: use of LR and PC simultaneously in the list is deprecated
+	ldmda r0!, {lr, pc}
+@ CHECK: warning: use of LR and PC simultaneously in the list is deprecated
+
+	.global ldmdb
+	.type ldmdb,%function
+ldmdb:
+	ldmdb r0!, {r1, sp}
+@ CHECK: warning: use of SP in the list is deprecated
+	ldmdb r0!, {sp}
+@ CHECK: warning: use of SP in the list is deprecated
+	ldmdb r0!, {r1, lr, pc}
+@ CHECK: warning: use of LR and PC simultaneously in the list is deprecated
+	ldmdb r0!, {lr, pc}
+@ CHECK: warning: use of LR and PC simultaneously in the list is deprecated
+
+	.global ldmib
+	.type ldmib,%function
+ldmib:
+	ldmib r0!, {r1, sp}
+@ CHECK: warning: use of SP in the list is deprecated
+	ldmib r0!, {sp}
+@ CHECK: warning: use of SP in the list is deprecated
+	ldmib r0!, {r1, lr, pc}
+@ CHECK: warning: use of LR and PC simultaneously in the list is deprecated
+	ldmib r0!, {lr, pc}
+@ CHECK: warning: use of LR and PC simultaneously in the list is deprecated
+
+	.global pop
+	.type pop,%function
+pop:
+	pop {r0, sp}
+@ CHECK: warning: use of SP in the list is deprecated
+@ CHECK-V7: error: writeback register not allowed in register list
+	pop {sp}
+@ CHECK: warning: use of SP in the list is deprecated
+@ CHECK-V7: error: writeback register not allowed in register list
+	pop {r0, lr, pc}
+@ CHECK: warning: use of LR and PC simultaneously in the list is deprecated
+	pop {lr, pc}
+@ CHECK: warning: use of LR and PC simultaneously in the list is deprecated
+
+	.global valid
+	.type valid,%function
+valid:
 	stmdaeq r0, {r0}
-@ CHECK-NOT: warning
+@ CHECK: stmdaeq r0, {r0}
+	ldmdaeq r0, {r0}
+@ CHECK: ldmdaeq r0, {r0}
+	pop {r0, pc}
+@ CHECK: pop {r0, pc}