[PowerPC] Use mtocrf when available

Just as with mfocrf, it is also preferable to use mtocrf instead of
mtcrf when only a single CR register is to be written.

Current code however always emits mtcrf.  This probably does not matter
when using an external assembler, since the GNU assembler will in fact
automatically replace mtcrf with mtocrf when possible.  It does create
inefficient code with the integrated assembler, however.

To fix this, this patch adds MTOCRF/MTOCRF8 instruction patterns and
uses those instead of MTCRF/MTCRF8 everything.  Just as done in the
MFOCRF patch committed as 185556, these patterns will be converted
back to MTCRF if MTOCRF is not available on the machine.

As a side effect, this allows to modify the MTCRF pattern to accept
the full range of mask operands for the benefit of the asm parser.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185561 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/Target/PowerPC/PPCCodeEmitter.cpp b/lib/Target/PowerPC/PPCCodeEmitter.cpp
index e9aa4c07ad..418736e21e 100644
--- a/lib/Target/PowerPC/PPCCodeEmitter.cpp
+++ b/lib/Target/PowerPC/PPCCodeEmitter.cpp
@@ -142,7 +142,7 @@ void PPCCodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
 unsigned PPCCodeEmitter::get_crbitm_encoding(const MachineInstr &MI,
                                              unsigned OpNo) const {
   const MachineOperand &MO = MI.getOperand(OpNo);
-  assert((MI.getOpcode() == PPC::MTCRF || MI.getOpcode() == PPC::MTCRF8 ||
+  assert((MI.getOpcode() == PPC::MTOCRF || MI.getOpcode() == PPC::MTOCRF8 ||
           MI.getOpcode() == PPC::MFOCRF || MI.getOpcode() == PPC::MFOCRF8) &&
          (MO.getReg() >= PPC::CR0 && MO.getReg() <= PPC::CR7));
   return 0x80 >> TM.getRegisterInfo()->getEncodingValue(MO.getReg());
@@ -274,9 +274,9 @@ unsigned PPCCodeEmitter::getMachineOpValue(const MachineInstr &MI,
                                            const MachineOperand &MO) const {
 
   if (MO.isReg()) {
-    // MTCRF/MFOCRF should go through get_crbitm_encoding for the CR operand.
+    // MTOCRF/MFOCRF should go through get_crbitm_encoding for the CR operand.
     // The GPR operand should come through here though.
-    assert((MI.getOpcode() != PPC::MTCRF && MI.getOpcode() != PPC::MTCRF8 &&
+    assert((MI.getOpcode() != PPC::MTOCRF && MI.getOpcode() != PPC::MTOCRF8 &&
             MI.getOpcode() != PPC::MFOCRF && MI.getOpcode() != PPC::MFOCRF8) ||
            MO.getReg() < PPC::CR0 || MO.getReg() > PPC::CR7);
     return TM.getRegisterInfo()->getEncodingValue(MO.getReg());