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diff src/cpu/ppc/vm/macroAssembler_ppc.inline.hpp @ 14436:b0133e4187d3

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8028471: PPC64 (part 215): opto: Extend ImplicitNullCheck optimization. Summary: Fixed Implicit NULL check optimization for AIX, where the page at address '0' is only write-protected. Reviewed-by: kvn
author goetz
date Thu, 21 Nov 2013 18:29:34 -0800
parents ec28f9c041ff
children 67fa91961822
line wrap: on
line diff
--- a/src/cpu/ppc/vm/macroAssembler_ppc.inline.hpp	Thu Nov 21 12:30:35 2013 -0800
+++ b/src/cpu/ppc/vm/macroAssembler_ppc.inline.hpp	Thu Nov 21 18:29:34 2013 -0800
@@ -269,7 +269,7 @@
 // No support for compressed oops (base page of heap).  Does not distinguish
 // loads and stores.
 inline void MacroAssembler::null_check_throw(Register a, int offset, Register temp_reg, address exception_entry) {
-  if (!ImplicitNullChecks || needs_explicit_null_check(offset) NOT_LINUX(|| true) /*!os::zero_page_read_protected()*/) {
+  if (!ImplicitNullChecks || needs_explicit_null_check(offset) || !os::zero_page_read_protected()) {
     if (TrapBasedNullChecks) {
       assert(UseSIGTRAP, "sanity");
       trap_null_check(a);
@@ -286,7 +286,7 @@
 }
 
 inline void MacroAssembler::ld_with_trap_null_check(Register d, int si16, Register s1) {
-  if ( NOT_LINUX(true) LINUX_ONLY(false)/*!os::zero_page_read_protected()*/) {
+  if (!os::zero_page_read_protected()) {
     if (TrapBasedNullChecks) {
       trap_null_check(s1);
     }
@@ -297,7 +297,7 @@
 // Attention: No null check for loaded uncompressed OOP. Can be used for loading klass field.
 inline void MacroAssembler::load_heap_oop_with_trap_null_check(Register d, RegisterOrConstant si16,
                                                                    Register s1) {
-  if ( NOT_LINUX(true)LINUX_ONLY(false) /*!os::zero_page_read_protected()*/) {
+  if ( !os::zero_page_read_protected()) {
     if (TrapBasedNullChecks) {
       trap_null_check(s1);
     }