ARM: Let the assembler reject v5 instructions in v4 mode.

PR18524.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199559 91177308-0d34-0410-b5e6-96231b3b80d8

Author: d0k

lib/Target/ARM/ARMInstrInfo.td

@@ -186,7 +186,8 @@ def ARMvminnm        : SDNode<"ARMISD::VMINNM", SDT_ARMVMINNM, []>;
 def HasV4T           : Predicate<"Subtarget->hasV4TOps()">,
                                  AssemblerPredicate<"HasV4TOps", "armv4t">;
 def NoV4T            : Predicate<"!Subtarget->hasV4TOps()">;
-def HasV5T           : Predicate<"Subtarget->hasV5TOps()">;
+def HasV5T           : Predicate<"Subtarget->hasV5TOps()">,
+                                 AssemblerPredicate<"HasV5TOps", "armv5t">;
 def HasV5TE          : Predicate<"Subtarget->hasV5TEOps()">,
                                  AssemblerPredicate<"HasV5TEOps", "armv5te">;
 def HasV6            : Predicate<"Subtarget->hasV6Ops()">,

test/MC/ARM/not-armv4.s

@@ -0,0 +1,8 @@
+@ RUN: not llvm-mc < %s -triple armv4-unknown-unknown -show-encoding 2>&1 | FileCheck %s
+
+@ PR18524
+@ CHECK: error: instruction requires: armv5t
+clz r4,r9
+
+@ CHECK: error: instruction requires: armv6t2
+rbit r4,r9