Thumb parsing and encoding for SVC.

llvm-svn: 138360

llvm/lib/Target/ARM/ARMInstrThumb.td

@@ -534,7 +534,7 @@ let isCall = 1, isTerminator = 1, isReturn = 1, isBarrier = 1 in {
 }
 
 
-// A8.6.218 Supervisor Call (Software Interrupt) -- for disassembly only
+// A8.6.218 Supervisor Call (Software Interrupt)
 // A8.6.16 B: Encoding T1
 // If Inst{11-8} == 0b1111 then SEE SVC
 let isCall = 1, Uses = [SP] in

llvm/test/MC/ARM/basic-thumb-instructions.s

@@ -533,3 +533,13 @@ _func:
         subs r1, r2, r3
 
 @ CHECK: subs	r1, r2, r3              @ encoding: [0xd1,0x1a]
+
+
+@------------------------------------------------------------------------------
+@ SVC
+@------------------------------------------------------------------------------
+        svc #0
+        svc #255
+
+@ CHECK: svc	#0                      @ encoding: [0x00,0xdf]
+@ CHECK: svc	#255                    @ encoding: [0xff,0xdf]

llvm/test/MC/ARM/thumb-diagnostics.s

@@ -108,3 +108,13 @@ error: invalid operand for instruction
 @ CHECK-ERRORS: error: instruction requires a CPU feature not currently enabled
 @ CHECK-ERRORS:         str r3, [r7, #128]
 @ CHECK-ERRORS:         ^
+
+@ Out of range immediate for SVC instruction.
+        svc #-1
+        svc #256
+@ CHECK-ERRORS: error: invalid operand for instruction
+@ CHECK-ERRORS:         svc #-1
+@ CHECK-ERRORS:             ^
+@ CHECK-ERRORS: error: instruction requires a CPU feature not currently enabled
+@ CHECK-ERRORS:         svc #256
+@ CHECK-ERRORS:         ^