commit 4e2c78228aca0a6be132ed1105649a78ec62e14c
author Hal Finkel <hfinkel@anl.gov> Mon Jan 05 18:09:06 2015 +0000
committer Hal Finkel <hfinkel@anl.gov> Mon Jan 05 18:09:06 2015 +0000
tree 7700db108e05bce959546849432aa515a22d609b
parent 5e079577e12e4b709639f5a92bcbd3e04c93052b

[PowerPC] Remove zexts after byte-swapping loads

lhbrx and lwbrx not only load their data with byte swapping, but also clear the
upper 32 bits (at least). As a result, they can be added to the PPCISelDAGToDAG
peephole optimization as frontier instructions for the removal of unnecessary
zero extensions.

llvm-svn: 225189

llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp

diff --git a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
index 7d7f557..3e787be 100644
--- a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -3729,6 +3729,13 @@
     return true;
   }
 
+  // LHBRX and LWBRX always clear the higher-order bits.
+  if (Op32.getMachineOpcode() == PPC::LHBRX ||
+      Op32.getMachineOpcode() == PPC::LWBRX) {
+    ToPromote.insert(Op32.getNode());
+    return true;
+  }
+
   // Next, check for those instructions we can look through.
 
   // Assuming the mask does not wrap around, then the higher-order bits are
@@ -3916,6 +3923,8 @@
       case PPC::SRW:       NewOpcode = PPC::SRW8; break;
       case PPC::LI:        NewOpcode = PPC::LI8; break;
       case PPC::LIS:       NewOpcode = PPC::LIS8; break;
+      case PPC::LHBRX:     NewOpcode = PPC::LHBRX8; break;
+      case PPC::LWBRX:     NewOpcode = PPC::LWBRX8; break;
       case PPC::RLWIMI:    NewOpcode = PPC::RLWIMI8; break;
       case PPC::OR:        NewOpcode = PPC::OR8; break;
       case PPC::SELECT_I4: NewOpcode = PPC::SELECT_I8; break;

llvm/lib/Target/PowerPC/PPCInstr64Bit.td

diff --git a/llvm/lib/Target/PowerPC/PPCInstr64Bit.td b/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
index 75f4656..29b13f8 100644
--- a/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
+++ b/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
@@ -843,6 +843,13 @@
                    "ldbrx $rD, $src", IIC_LdStLoad,
                    [(set i64:$rD, (PPClbrx xoaddr:$src, i64))]>, isPPC64;
 
+let mayLoad = 1, hasSideEffects = 0, isCodeGenOnly = 1 in {
+def LHBRX8 : XForm_1<31, 790, (outs g8rc:$rD), (ins memrr:$src),
+                   "lhbrx $rD, $src", IIC_LdStLoad, []>;
+def LWBRX8 : XForm_1<31,  534, (outs g8rc:$rD), (ins memrr:$src),
+                   "lwbrx $rD, $src", IIC_LdStLoad, []>;
+}
+
 let mayLoad = 1, hasSideEffects = 0 in {
 def LDU  : DSForm_1<58, 1, (outs g8rc:$rD, ptr_rc_nor0:$ea_result), (ins memrix:$addr),
                     "ldu $rD, $addr", IIC_LdStLDU,