[Sparc] Generate ta 1 for the @llvm.debugtrap intrinsic

[dcederman]

Summary

Software trap number one is the trap used for breakpoints in the Sparc ABI.

llvm/trunk/lib/Target/Sparc/SparcISelLowering.cpp

SparcTargetLowering::SparcTargetLowering(const TargetMachine &TM,
   }
 
   // VASTART needs to be custom lowered to use the VarArgsFrameIndex.
   setOperationAction(ISD::VASTART           , MVT::Other, Custom);
   // VAARG needs to be lowered to not do unaligned accesses for doubles.
   setOperationAction(ISD::VAARG             , MVT::Other, Custom);
 
   setOperationAction(ISD::TRAP              , MVT::Other, Legal);
+  setOperationAction(ISD::DEBUGTRAP         , MVT::Other, Legal);
 
   // Use the default implementation.
   setOperationAction(ISD::VACOPY            , MVT::Other, Expand);
   setOperationAction(ISD::VAEND             , MVT::Other, Expand);
   setOperationAction(ISD::STACKSAVE         , MVT::Other, Expand);
   setOperationAction(ISD::STACKRESTORE      , MVT::Other, Expand);
   setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32  , Custom);
 

llvm/trunk/lib/Target/Sparc/SparcInstrInfo.td

 
 let DecoderNamespace = "SparcV9", DecoderMethod = "DecodeTRAP", Predicates = [HasV9], hasSideEffects = 1, Uses = [ICC], cc = 0b00 in
   defm TICC : TRAP<"%icc">;
 
 
 let isBarrier = 1, isTerminator = 1, rd = 0b01000, rs1 = 0, simm13 = 5 in
   def TA5 : F3_2<0b10, 0b111010, (outs), (ins), "ta 5", [(trap)]>;
 
+def : Pat<(debugtrap),
+  (TRAPri (i32 G0), (i32 1), (i32 8))>;
+
 // Section B.28 - Read State Register Instructions
 let rs2 = 0 in
   def RDASR : F3_1<2, 0b101000,
                  (outs IntRegs:$rd), (ins ASRRegs:$rs1),
                  "rd $rs1, $rd", []>;
 
 // PSR, WIM, and TBR don't exist on the SparcV9, only the V8.
 let Predicates = [HasNoV9] in {

llvm/trunk/test/CodeGen/SPARC/trap.ll

 ; RUN: llc -mtriple=sparc-linux-gnu < %s -show-mc-encoding | FileCheck %s
 
 define void @test1() {
   tail call void @llvm.trap()
   unreachable
 
 ; CHECK-LABEL: test1:
 ; CHECK: ta 5 ! encoding: [0x91,0xd0,0x20,0x05]
 }
 
 declare void @llvm.trap()
+
+; CHECK-LABEL: testdebugtrap:
+; CHECK: ta 1 ! encoding: [0x91,0xd0,0x20,0x01]
+define void @testdebugtrap() {
+entry:
+  call void @llvm.debugtrap()
+  ret void
+}
+
+declare void @llvm.debugtrap()