Arm64: Remove forced csp alignment to 16 byte values for Nvidia chips.

src/arm64/macro-assembler-arm64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ARM64_MACRO_ASSEMBLER_ARM64_H_
 #define V8_ARM64_MACRO_ASSEMBLER_ARM64_H_
 
 #include <vector>
 
 #include "src/bailout-reason.h"
@@ skipping 743 matching lines @@
   // it will be encoded in the event marker.
   inline void AnnotateInstrumentation(const char* marker_name);
 
   // If emit_debug_code() is true, emit a run-time check to ensure that
   // StackPointer() does not point below the system stack pointer.
   //
   // Whilst it is architecturally legal for StackPointer() to point below csp,
   // it can be evidence of a potential bug because the ABI forbids accesses
   // below csp.
   //
-  // If StackPointer() is the system stack pointer (csp) or ALWAYS_ALIGN_CSP is
-  // enabled, then csp will be dereferenced to  cause the processor
-  // (or simulator) to abort if it is not properly aligned.
+  // If StackPointer() is the system stack pointer (csp), then csp will be
+  // dereferenced to cause the processor (or simulator) to abort if it is not
+  // properly aligned.
   //
   // If emit_debug_code() is false, this emits no code.
   void AssertStackConsistency();
 
   // Preserve the callee-saved registers (as defined by AAPCS64).
   //
   // Higher-numbered registers are pushed before lower-numbered registers, and
   // thus get higher addresses.
   // Floating-point registers are pushed before general-purpose registers, and
   // thus get higher addresses.
@@ skipping 47 matching lines @@
   // This is necessary when pushing or otherwise adding things to the stack, to
   // satisfy the AAPCS64 constraint that the memory below the system stack
   // pointer is not accessed.  The amount pushed will be increased as necessary
   // to ensure csp remains aligned to 16 bytes.
   //
   // This method asserts that StackPointer() is not csp, since the call does
   // not make sense in that context.
   inline void BumpSystemStackPointer(const Operand& space);
 
   // Re-synchronizes the system stack pointer (csp) with the current stack
-  // pointer (according to StackPointer()).  This function will ensure the
-  // new value of the system stack pointer is remains aligned to 16 bytes, and
-  // is lower than or equal to the value of the current stack pointer.
+  // pointer (according to StackPointer()).
   //
   // This method asserts that StackPointer() is not csp, since the call does
   // not make sense in that context.
   inline void SyncSystemStackPointer();
 
   // Helpers ------------------------------------------------------------------
   // Root register.
   inline void InitializeRootRegister();
 
   void AssertFPCRState(Register fpcr = NoReg);
@@ skipping 1485 matching lines @@
 #error "Unsupported option"
 #define CODE_COVERAGE_STRINGIFY(x) #x
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 #endif  // V8_ARM64_MACRO_ASSEMBLER_ARM64_H_