[SPARC] Cleanup handling of the Y/ASR registers.

- Implement copying ASR to/from GPR regs.
- Mark ASRs as non-allocatable, so it won't try to arbitrarily use
  them inappropriately.
- Instead of inserting explicit WRASR/RDASR nodes in the MUL/DIV
  routines, just do normal register copies.
- Also...mark div as using Y, not just writing it.

Added a test case with some code which previously died with an
assertion failure (with -O0), or produced wrong code (otherwise).

(Third time's the charm?)

Differential Revision: http://reviews.llvm.org/D10401

llvm-svn: 241686

1 files changed, 9 insertions, 0 deletions

diff --git a/llvm/lib/Target/Sparc/SparcInstrInfo.cpp b/llvm/lib/Target/Sparc/SparcInstrInfo.cpp
index f87cee43e31..6167c532db8 100644
--- a/llvm/lib/Target/Sparc/SparcInstrInfo.cpp
+++ b/llvm/lib/Target/Sparc/SparcInstrInfo.cpp
@@ -324,6 +324,15 @@ void SparcInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
       numSubRegs = 4;
       movOpc     = SP::FMOVS;
     }
+  } else if (SP::ASRRegsRegClass.contains(DestReg) &&
+             SP::IntRegsRegClass.contains(SrcReg)) {
+    BuildMI(MBB, I, DL, get(SP::WRASRrr), DestReg)
+        .addReg(SP::G0)
+        .addReg(SrcReg, getKillRegState(KillSrc));
+  } else if (SP::IntRegsRegClass.contains(DestReg) &&
+             SP::ASRRegsRegClass.contains(SrcReg)) {
+    BuildMI(MBB, I, DL, get(SP::RDASR), DestReg)
+        .addReg(SrcReg, getKillRegState(KillSrc));
   } else
     llvm_unreachable("Impossible reg-to-reg copy");