Select @llvm.trap to the special B with 1111 condition (i.e. trap) instruction.

llvm-svn: 103459

llvm/lib/Target/ARM/ARMISelLowering.cpp

@@ -384,6 +384,8 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
   setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
   setOperationAction(ISD::BlockAddress, MVT::i32, Custom);
 
+  setOperationAction(ISD::TRAP, MVT::Other, Legal);
+
   // Use the default implementation.
   setOperationAction(ISD::VASTART,            MVT::Other, Custom);
   setOperationAction(ISD::VAARG,              MVT::Other, Expand);

llvm/lib/Target/ARM/ARMInstrInfo.td

@@ -791,8 +791,8 @@ def DBG : AI<(outs), (ins i32imm:$opt), MiscFrm, NoItinerary, "dbg", "\t$opt",
 }
 
 // A5.4 Permanently UNDEFINED instructions.
-def TRAP : AI<(outs), (ins), MiscFrm, NoItinerary, "trap", "",
-              [/* For disassembly only; pattern left blank */]>,
+let isBarrier = 1, isTerminator = 1 in
+def TRAP : AXI<(outs), (ins), MiscFrm, NoItinerary, "trap", [(trap)]>,
            Requires<[IsARM]> {
   let Inst{27-25} = 0b011;
   let Inst{24-20} = 0b11111;

llvm/lib/Target/ARM/ARMInstrThumb.td

@@ -417,9 +417,10 @@ def tSVC : T1pI<(outs), (ins i32imm:$svc), IIC_Br, "svc", "\t$svc", []>,
 }
 }
 
-// A8.6.16 B: Encoding T1 -- for disassembly only
+// A8.6.16 B: Encoding T1
 // If Inst{11-8} == 0b1110 then UNDEFINED
-def tTRAP : T1I<(outs), (ins), IIC_Br, "trap", []>, Encoding16 {
+let isBarrier = 1, isTerminator = 1 in
+def tTRAP : TI<(outs), (ins), IIC_Br, "trap", [(trap)]>, Encoding16 {
   let Inst{15-12} = 0b1101;
   let Inst{11-8} = 0b1110;
 }

llvm/test/CodeGen/ARM/trap.ll

@@ -0,0 +1,12 @@
+; RUN: llc < %s -march=arm | FileCheck %s
+; rdar://7961298
+
+define arm_apcscc void @t() nounwind {
+entry:
+; CHECK: t:
+; CHECK: trap
+  call void @llvm.trap()
+  unreachable
+}
+
+declare void @llvm.trap() nounwind

llvm/test/CodeGen/Thumb/trap.ll

@@ -0,0 +1,12 @@
+; RUN: llc < %s -march=thumb | FileCheck %s
+; rdar://7961298
+
+define arm_apcscc void @t() nounwind {
+entry:
+; CHECK: t:
+; CHECK: trap
+  call void @llvm.trap()
+  unreachable
+}
+
+declare void @llvm.trap() nounwind