Increase spill area

Bump it from 8 to 16 Cells.

hphp/runtime/vm/translator/abi-x64.h

@@ -335,8 +335,8 @@ const RegSet kAllX64Regs = RegSet(kAllRegs).add(reg::r10)
  * address).  It is used as spill locations by HHIR (see LinearScan),
  * and for MInstrState in both HHIR and translator-x64-vector.cpp.
  */
-const size_t kReservedRSPScratchSpace = 0x100;
-const size_t kReservedRSPSpillSpace = 0x80;
+const size_t kReservedRSPScratchSpace = 0x180;
+const size_t kReservedRSPSpillSpace   = 0x100;
 
 //////////////////////////////////////////////////////////////////////
 

hphp/runtime/vm/translator/hopt/linearscan.h

@@ -29,7 +29,7 @@ class IRFactory;
 // This value must be consistent with the number of pre-allocated
 // bytes for spill locations in __enterTCHelper in translator-x64.cpp.
 // Be careful when changing this value.
-const int NumPreAllocatedSpillLocs = 16;
+const int NumPreAllocatedSpillLocs = 32;
 
 struct UseInfo {
   UseInfo() : lastUse(0), count(0) {}

hphp/runtime/vm/translator/translator-asm-helpers.S

@@ -45,7 +45,7 @@ enterTCHelper:
    * 16-byte aligned.
    */
 
-  sub $0x100, %rsp // kReservedRSPScratchSpace
+  sub $0x180, %rsp // kReservedRSPScratchSpace
 
   /*
    * If returning from a BIND_CALL request, push the return IP saved
@@ -63,7 +63,7 @@ enterTCHelper:
   call *%rdx
 .LenterTCHelper$serviceReqLabel:
 
-  add $0x100, %rsp // kReservedRSPScratchSpace
+  add $0x180, %rsp // kReservedRSPScratchSpace
   // Restore infoPtr into %rbx
   pop %rbx
   .cfi_adjust_cfa_offset -8

hphp/runtime/vm/translator/translator-x64.cpp

@@ -2851,7 +2851,7 @@ static_assert(rVmSp == rbx &&
               rVmTl == r12 &&
               rStashedAR == r15,
               "__enterTCHelper needs to be modified to use the correct ABI");
-static_assert(kReservedRSPScratchSpace == 0x100,
+static_assert(kReservedRSPScratchSpace == 0x180,
               "enterTCHelper needs to be updated for changes to "
               "kReservedRSPScratchSpace");
 static_assert(REQ_BIND_CALL == 0x1,