Add support for the PowerPC 64-bit SVR4 ABI.

The Link Register is volatile when using the 32-bit SVR4 ABI.
Make it possible to use the 64-bit SVR4 ABI.
Add non-volatile registers for the 64-bit SVR4 ABI.
Make sure r2 is a reserved register when using the 64-bit SVR4 ABI.
Update PPCFrameInfo for the 64-bit SVR4 ABI.
Add FIXME for 64-bit Darwin PPC.
Insert NOP instruction after direct function calls.
Emit official procedure descriptors.
Create TOC entries for GlobalAddress references.
Spill 64-bit non-volatile registers to the correct slots.
Only custom lower VAARG when using the 32-bit SVR4 ABI.
Use simple VASTART lowering for the 64-bit SVR4 ABI.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79091 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCInstr64Bit.td b/lib/Target/PowerPC/PPCInstr64Bit.td
index 3823e53..85524ce 100644
--- a/lib/Target/PowerPC/PPCInstr64Bit.td
+++ b/lib/Target/PowerPC/PPCInstr64Bit.td
@@ -123,6 +123,8 @@
           (BL8_ELF tglobaladdr:$dst)>;
 def : Pat<(PPCcall_SVR4 (i64 texternalsym:$dst)),
           (BL8_ELF texternalsym:$dst)>;
+def : Pat<(PPCnop),
+          (NOP)>;
 
 // Atomic operations
 let usesCustomDAGSchedInserter = 1 in {
@@ -543,6 +545,10 @@
 def LD   : DSForm_1<58, 0, (outs G8RC:$rD), (ins memrix:$src),
                     "ld $rD, $src", LdStLD,
                     [(set G8RC:$rD, (load ixaddr:$src))]>, isPPC64;
+def LDtoc: DSForm_1<58, 0, (outs G8RC:$rD), (ins tocentry:$disp, G8RC:$reg),
+                    "ld $rD, $disp($reg)", LdStLD,
+                    [(set G8RC:$rD,
+                     (PPCtoc_entry tglobaladdr:$disp, G8RC:$reg))]>, isPPC64;
 def LDX  : XForm_1<31,  21, (outs G8RC:$rD), (ins memrr:$src),
                    "ldx $rD, $src", LdStLD,
                    [(set G8RC:$rD, (load xaddr:$src))]>, isPPC64;