[SPARC][IAS] Add aliases for %asr20-21 as defined in JPS1

This adds %set_softint and %clear_softint alias for %asr20 and %asr21
as defined in JPS1.

Reviewers: jrtc27, brad0, s-barannikov, rorth

Reviewed By: s-barannikov

Pull Request: #94247

Author: koachan

llvm/lib/Target/Sparc/AsmParser/SparcAsmParser.cpp

@@ -1384,12 +1384,11 @@ MCRegister SparcAsmParser::matchRegisterName(const AsmToken &Tok,
   }
 
   // JPS1 extension - aliases for ASRs
-  // Section A.51 - Read State Register
+  // Section 5.2.11 - Ancillary State Registers (ASRs)
   if (Name == "pcr") {
     RegKind = SparcOperand::rk_Special;
     return SP::ASR16;
   }
-
   if (Name == "pic") {
     RegKind = SparcOperand::rk_Special;
     return SP::ASR17;
@@ -1402,6 +1401,14 @@ MCRegister SparcAsmParser::matchRegisterName(const AsmToken &Tok,
     RegKind = SparcOperand::rk_Special;
     return SP::ASR19;
   }
+  if (Name == "set_softint") {
+    RegKind = SparcOperand::rk_Special;
+    return SP::ASR20;
+  }
+  if (Name == "clear_softint") {
+    RegKind = SparcOperand::rk_Special;
+    return SP::ASR21;
+  }
   if (Name == "softint") {
     RegKind = SparcOperand::rk_Special;
     return SP::ASR22;

llvm/test/MC/Sparc/sparcv9-instructions.s

@@ -502,6 +502,10 @@
         wr %i0, %i1, %ccr
         ! V9: wr %i0, 1, %ccr           ! encoding: [0x85,0x86,0x20,0x01]
         wr %i0, 1, %ccr
+        ! V9: wr %i0, 1, %asr20         ! encoding: [0xa9,0x86,0x20,0x01]
+        wr %i0, 1, %set_softint
+        ! V9: wr %i0, 1, %asr21         ! encoding: [0xab,0x86,0x20,0x01]
+        wr %i0, 1, %clear_softint
 
         ! V9: st %o1, [%o0]             ! encoding: [0xd2,0x22,0x00,0x00]
         stw %o1, [%o0]