Sparc: Prefer reg+reg address encoding when only one register used.

[jyknight]

Summary

Reg+%g0 is preferred to Reg+imm0 by the manual, and is what GCC produces.

Futhermore, reg+imm is invalid for the (not yet supported) "alternate address space" instructions.

[jyknight]

(No real changes; just rebased to not be on top of the LDD/STD patch)

[jyknight]

Ping

[venkatra]

LGTM.

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

MorphToMEMrr(unsigned Base, std::unique_ptr<SparcOperand> Op) {
     Op->Kind = k_MemoryReg;
     Op->Mem.Base = Base;
     Op->Mem.OffsetReg = offsetReg;
     Op->Mem.Off = nullptr;
     return Op;
   }
 
   static std::unique_ptr<SparcOperand>
-  CreateMEMri(unsigned Base, const MCExpr *Off, SMLoc S, SMLoc E) {
-    auto Op = make_unique<SparcOperand>(k_MemoryImm);
+  CreateMEMr(unsigned Base, SMLoc S, SMLoc E) {
+    auto Op = make_unique<SparcOperand>(k_MemoryReg);
     Op->Mem.Base = Base;
-    Op->Mem.OffsetReg = 0;
-    Op->Mem.Off = Off;
+    Op->Mem.OffsetReg = Sparc::G0;  // always 0
+    Op->Mem.Off = nullptr;
     Op->StartLoc = S;
     Op->EndLoc = E;
     return Op;
   }
 
   static std::unique_ptr<SparcOperand>
   MorphToMEMri(unsigned Base, std::unique_ptr<SparcOperand> Op) {
     const MCExpr *Imm  = Op->getImm();
SparcAsmParser::parseMEMOperand(OperandVector &Operands) {
   }
 
   switch (getLexer().getKind()) {
   default: return MatchOperand_NoMatch;
 
   case AsmToken::Comma:
   case AsmToken::RBrac:
   case AsmToken::EndOfStatement:
-    Operands.push_back(SparcOperand::CreateMEMri(BaseReg, nullptr, S, E));
+    Operands.push_back(SparcOperand::CreateMEMr(BaseReg, S, E));
     return MatchOperand_Success;
 
   case AsmToken:: Plus:
     Parser.Lex(); // Eat the '+'
     break;
   case AsmToken::Minus:
     break;
   }

llvm/trunk/test/MC/Disassembler/Sparc/sparc-mem.txt

 # RUN: llvm-mc --disassemble %s -triple=sparcv9-unknown-linux | FileCheck %s
 
 # CHECK:      ldsb [%i0+%l6], %o2
 0xd4 0x4e 0x00 0x16
 
 # CHECK:      ldsb [%i0+32], %o2
 0xd4 0x4e 0x20 0x20
 
 # CHECK:      ldsb [%g1], %o4
 0xd8 0x48 0x60 0x00
 
+# CHECK:      ldsb [%g1], %o4
+0xd8 0x48 0x40 0x00
+
 # CHECK:      ldsh [%i0+%l6], %o2
 0xd4 0x56 0x00 0x16
 
 # CHECK:      ldsh [%i0+32], %o2
 0xd4 0x56 0x20 0x20
 
 # CHECK:      ldsh [%g1], %o4
 0xd8 0x50 0x60 0x00
 
+# CHECK:      ldsh [%g1], %o4
+0xd8 0x50 0x40 0x00
+
 # CHECK:      ldub [%i0+%l6], %o2
 0xd4 0x0e 0x00 0x16
 
 # CHECK:      ldub [%i0+32], %o2
 0xd4 0x0e 0x20 0x20
 
 # CHECK:      ldub [%g1], %o2
 0xd4 0x08 0x60 0x00
 
+# CHECK:      ldub [%g1], %o2
+0xd4 0x08 0x40 0x00
+
 # CHECK:      lduh [%i0+%l6], %o2
 0xd4 0x16 0x00 0x16
 
 # CHECK:      lduh [%i0+32], %o2
 0xd4 0x16 0x20 0x20
 
 # CHECK:      lduh [%g1], %o2
 0xd4 0x10 0x60 0x00
 
+# CHECK:      lduh [%g1], %o2
+0xd4 0x10 0x40 0x00
+
 # CHECK:      ld [%i0+%l6], %o2
 0xd4 0x06 0x00 0x16
 
 # CHECK:      ld [%i0+32], %o2
 0xd4 0x06 0x20 0x20
 
 # CHECK:      ld [%g1], %o2
 0xd4 0x00 0x60 0x00
 
+# CHECK:      ld [%g1], %o2
+0xd4 0x00 0x40 0x00
+
 # CHECK:     ld [%i0+%l6], %f2
 0xc5 0x06 0x00 0x16
 
 # CHECK:     ld [%i0+32], %f2
 0xc5 0x06 0x20 0x20
 
 # CHECK:     ld [%g1], %f2
 0xc5 0x00 0x60 0x00
 
+# CHECK:     ld [%g1], %f2
+0xc5 0x00 0x40 0x00
+
 # CHECK:     ldd [%i0+%l6], %f2
 0xc5 0x1e 0x00 0x16
 
 # CHECK:     ldd [%i0+32], %f2
 0xc5 0x1e 0x20 0x20
 
 # CHECK:     ldd [%g1], %f2
 0xc5 0x18 0x60 0x00
 
+# CHECK:     ldd [%g1], %f2
+0xc5 0x18 0x40 0x00
+
 # CHECK:     ldq [%i0+%l6], %f4
 0xc9 0x16 0x00 0x16
 
 # CHECK:     ldq [%i0+32], %f4
 0xc9 0x16 0x20 0x20
 
 # CHECK:     ldq [%g1], %f4
 0xc9 0x10 0x60 0x00
 
+# CHECK:     ldq [%g1], %f4
+0xc9 0x10 0x40 0x00
+
 # CHECK:     ldx [%i0+%l6], %o2
 0xd4 0x5e 0x00 0x16
 
 # CHECK:     ldx [%i0+32], %o2
 0xd4 0x5e 0x20 0x20
 
 # CHECK:     ldx [%g1], %o2
 0xd4 0x58 0x60 0x00
 
+# CHECK:     ldx [%g1], %o2
+0xd4 0x58 0x40 0x00
+
 # CHECK:     ldsw [%i0+%l6], %o2
 0xd4 0x46 0x00 0x16
 
 # CHECK:     ldsw [%i0+32], %o2
 0xd4 0x46 0x20 0x20
 
 # CHECK:     ldsw [%g1], %o2
 0xd4 0x40 0x60 0x00
 
+# CHECK:     ldsw [%g1], %o2
+0xd4 0x40 0x40 0x00
+
 # CHECK:      stb %o2, [%i0+%l6]
 0xd4 0x2e 0x00 0x16
 
 # CHECK:      stb %o2, [%i0+32]
 0xd4 0x2e 0x20 0x20
 
 # CHECK:      stb %o2, [%g1]
 0xd4 0x28 0x60 0x00
 
+# CHECK:      stb %o2, [%g1]
+0xd4 0x28 0x40 0x00
+
 # CHECK:      sth %o2, [%i0+%l6]
 0xd4 0x36 0x00 0x16
 
 # CHECK:      sth %o2, [%i0+32]
 0xd4 0x36 0x20 0x20
 
 # CHECK:      sth %o2, [%g1]
 0xd4 0x30 0x60 0x00
 
+# CHECK:      sth %o2, [%g1]
+0xd4 0x30 0x40 0x00
+
 # CHECK:      st %o2, [%i0+%l6]
 0xd4 0x26 0x00 0x16
 
 # CHECK:      st %o2, [%i0+32]
 0xd4 0x26 0x20 0x20
 
 # CHECK:      st %o2, [%g1]
 0xd4 0x20 0x60 0x00
 
+# CHECK:      st %o2, [%g1]
+0xd4 0x20 0x40 0x00
+
 # CHECK:      st %f2, [%i0+%l6]
 0xc5 0x26 0x00 0x16
 
 # CHECK:      st %f2, [%i0+32]
 0xc5 0x26 0x20 0x20
 
 # CHECK:      st %f2, [%g1]
 0xc5 0x20 0x60 0x00
 
+# CHECK:      st %f2, [%g1]
+0xc5 0x20 0x40 0x00
+
 # CHECK:      std %f2, [%i0+%l6]
 0xc5 0x3e 0x00 0x16
 
 # CHECK:      std %f2, [%i0+32]
 0xc5 0x3e 0x20 0x20
 
 # CHECK:      std %f2, [%g1]
 0xc5 0x38 0x60 0x00
 
+# CHECK:      std %f2, [%g1]
+0xc5 0x38 0x40 0x00
+
 # CHECK:      stq %f4, [%i0+%l6]
 0xc9 0x36 0x00 0x16
 
 # CHECK:      stq %f4, [%i0+32]
 0xc9 0x36 0x20 0x20
 
 # CHECK:      stq %f4, [%g1]
 0xc9 0x30 0x60 0x00
 
+# CHECK:      stq %f4, [%g1]
+0xc9 0x30 0x40 0x00
+
 # CHECK:      stx %o2, [%i0+%l6]
 0xd4 0x76 0x00 0x16
 
 # CHECK:      stx %o2, [%i0+32]
 0xd4 0x76 0x20 0x20
 
 # CHECK:      stx %o2, [%g1]
 0xd4 0x70 0x60 0x00
 
+# CHECK:      stx %o2, [%g1]
+0xd4 0x70 0x40 0x00
+
 # CHECK:     swap [%i0+%l6], %o2
 0xd4 0x7e 0x00 0x16
 
 # CHECK:     swap [%i0+32], %o2
 0xd4 0x7e 0x20 0x20
 
 # CHECK:     swap [%g1], %o2
 0xd4 0x78 0x60 0x00
+
+# CHECK:     swap [%g1], %o2
+0xd4 0x78 0x40 0x00

llvm/trunk/test/MC/Sparc/sparc-ctrl-instructions.s

 ! RUN: llvm-mc %s -arch=sparc   -show-encoding | FileCheck %s
 ! RUN: llvm-mc %s -arch=sparcv9 -show-encoding | FileCheck %s
 
         ! CHECK: call foo     ! encoding: [0b01AAAAAA,A,A,A]
         ! CHECK:              !   fixup A - offset: 0, value: foo, kind: fixup_sparc_call30
         call foo
 
         ! CHECK: call %g1+%i2 ! encoding: [0x9f,0xc0,0x40,0x1a]
         call %g1 + %i2
 
         ! CHECK: call %o1+8   ! encoding: [0x9f,0xc2,0x60,0x08]
         call %o1 + 8
 
-        ! CHECK: call %g1     ! encoding: [0x9f,0xc0,0x60,0x00]
+        ! CHECK: call %g1     ! encoding: [0x9f,0xc0,0x40,0x00]
         call %g1
 
         ! CHECK: call %g1+%lo(sym)   ! encoding: [0x9f,0xc0,0b011000AA,A]
         ! CHECK-NEXT:                ! fixup A - offset: 0, value: %lo(sym), kind: fixup_sparc_lo10
         call %g1+%lo(sym)
 
         ! CHECK: jmp %g1+%i2  ! encoding: [0x81,0xc0,0x40,0x1a]
         jmp %g1 + %i2
 
         ! CHECK: jmp %o1+8    ! encoding: [0x81,0xc2,0x60,0x08]
         jmp %o1 + 8
 
-        ! CHECK: jmp %g1      ! encoding: [0x81,0xc0,0x60,0x00]
+        ! CHECK: jmp %g1      ! encoding: [0x81,0xc0,0x40,0x00]
         jmp %g1
 
         ! CHECK: jmp %g1+%lo(sym)   ! encoding: [0x81,0xc0,0b011000AA,A]
         ! CHECK-NEXT:                ! fixup A - offset: 0, value: %lo(sym), kind: fixup_sparc_lo10
         jmp %g1+%lo(sym)
 
         ! CHECK: jmpl %g1+%i2, %g2  ! encoding: [0x85,0xc0,0x40,0x1a]
         jmpl %g1 + %i2, %g2
 
         ! CHECK: jmpl %o1+8, %g2    ! encoding: [0x85,0xc2,0x60,0x08]
         jmpl %o1 + 8, %g2
 
-        ! CHECK: jmpl %g1, %g2      ! encoding: [0x85,0xc0,0x60,0x00]
+        ! CHECK: jmpl %g1, %g2      ! encoding: [0x85,0xc0,0x40,0x00]
         jmpl %g1, %g2
 
         ! CHECK: jmpl %g1+%lo(sym), %g2   ! encoding: [0x85,0xc0,0b011000AA,A]
         ! CHECK-NEXT:                     ! fixup A - offset: 0, value: %lo(sym), kind: fixup_sparc_lo10
         jmpl %g1+%lo(sym), %g2
 
         ! CHECK: ba .BB0      ! encoding: [0x10,0b10AAAAAA,A,A]
         ! CHECK-NEXT:         ! fixup A - offset: 0, value: .BB0, kind: fixup_sparc_br22

llvm/trunk/test/MC/Sparc/sparc-mem-instructions.s

 ! RUN: llvm-mc %s -arch=sparc   -show-encoding | FileCheck %s
 ! RUN: llvm-mc %s -arch=sparcv9 -show-encoding | FileCheck %s
 
         ! CHECK: ldsb [%i0+%l6], %o2  ! encoding: [0xd4,0x4e,0x00,0x16]
         ldsb [%i0 + %l6], %o2
         ! CHECK: ldsb [%i0+32], %o2   ! encoding: [0xd4,0x4e,0x20,0x20]
         ldsb [%i0 + 32], %o2
-        ! CHECK: ldsb [%g1], %o4      ! encoding: [0xd8,0x48,0x60,0x00]
+        ! CHECK: ldsb [%g1], %o4      ! encoding: [0xd8,0x48,0x40,0x00]
         ldsb [%g1], %o4
 
         ! CHECK: ldsh [%i0+%l6], %o2  ! encoding: [0xd4,0x56,0x00,0x16]
         ldsh [%i0 + %l6], %o2
         ! CHECK: ldsh [%i0+32], %o2   ! encoding: [0xd4,0x56,0x20,0x20]
         ldsh [%i0 + 32], %o2
-        ! CHECK: ldsh [%g1], %o4      ! encoding: [0xd8,0x50,0x60,0x00]
+        ! CHECK: ldsh [%g1], %o4      ! encoding: [0xd8,0x50,0x40,0x00]
         ldsh [%g1], %o4
 
         ! CHECK: ldub [%i0+%l6], %o2  ! encoding: [0xd4,0x0e,0x00,0x16]
         ldub [%i0 + %l6], %o2
         ! CHECK: ldub [%i0+32], %o2   ! encoding: [0xd4,0x0e,0x20,0x20]
         ldub [%i0 + 32], %o2
-        ! CHECK: ldub [%g1], %o2      ! encoding: [0xd4,0x08,0x60,0x00]
+        ! CHECK: ldub [%g1], %o2      ! encoding: [0xd4,0x08,0x40,0x00]
         ldub [%g1], %o2
 
         ! CHECK: lduh [%i0+%l6], %o2  ! encoding: [0xd4,0x16,0x00,0x16]
         lduh [%i0 + %l6], %o2
         ! CHECK: lduh [%i0+32], %o2   ! encoding: [0xd4,0x16,0x20,0x20]
         lduh [%i0 + 32], %o2
-        ! CHECK: lduh [%g1], %o2      ! encoding: [0xd4,0x10,0x60,0x00]
+        ! CHECK: lduh [%g1], %o2      ! encoding: [0xd4,0x10,0x40,0x00]
         lduh [%g1], %o2
 
         ! CHECK: ld [%i0+%l6], %o2    ! encoding: [0xd4,0x06,0x00,0x16]
         ld [%i0 + %l6], %o2
         ! CHECK: ld [%i0+32], %o2     ! encoding: [0xd4,0x06,0x20,0x20]
         ld [%i0 + 32], %o2
-        ! CHECK: ld [%g1], %o2        ! encoding: [0xd4,0x00,0x60,0x00]
+        ! CHECK: ld [%g1], %o2        ! encoding: [0xd4,0x00,0x40,0x00]
         ld [%g1], %o2
 
         ! CHECK: stb %o2, [%i0+%l6]   ! encoding: [0xd4,0x2e,0x00,0x16]
         stb %o2, [%i0 + %l6]
         ! CHECK: stb %o2, [%i0+32]    ! encoding: [0xd4,0x2e,0x20,0x20]
         stb %o2, [%i0 + 32]
-        ! CHECK: stb %o2, [%g1]       ! encoding: [0xd4,0x28,0x60,0x00]
+        ! CHECK: stb %o2, [%g1]       ! encoding: [0xd4,0x28,0x40,0x00]
         stb %o2, [%g1]
 
         ! CHECK: sth %o2, [%i0+%l6]   ! encoding: [0xd4,0x36,0x00,0x16]
         sth %o2, [%i0 + %l6]
         ! CHECK: sth %o2, [%i0+32]    ! encoding: [0xd4,0x36,0x20,0x20]
         sth %o2, [%i0 + 32]
-        ! CHECK: sth %o2, [%g1]       ! encoding: [0xd4,0x30,0x60,0x00]
+        ! CHECK: sth %o2, [%g1]       ! encoding: [0xd4,0x30,0x40,0x00]
         sth %o2, [%g1]
 
         ! CHECK: st %o2, [%i0+%l6]    ! encoding: [0xd4,0x26,0x00,0x16]
         st %o2, [%i0 + %l6]
         ! CHECK: st %o2, [%i0+32]     ! encoding: [0xd4,0x26,0x20,0x20]
         st %o2, [%i0 + 32]
-        ! CHECK: st %o2, [%g1]        ! encoding: [0xd4,0x20,0x60,0x00]
+        ! CHECK: st %o2, [%g1]        ! encoding: [0xd4,0x20,0x40,0x00]
         st %o2, [%g1]