Mercurial > hg > graal-compiler

diff src/cpu/x86/vm/interp_masm_x86_64.cpp @ 113:ba764ed4b6f2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
author coleenp
date Sun, 13 Apr 2008 17:43:42 -0400
parents a61af66fc99e
children 6d172e3548cb 37f87013dfd8
line wrap: on
line diff
--- a/src/cpu/x86/vm/interp_masm_x86_64.cpp	Fri Apr 11 09:56:35 2008 -0400
+++ b/src/cpu/x86/vm/interp_masm_x86_64.cpp	Sun Apr 13 17:43:42 2008 -0400
@@ -267,15 +267,29 @@
   addq(rdi, arrayOopDesc::base_offset_in_bytes(T_OBJECT));
   // Scan rcx words at [rdi] for occurance of rax
   // Set NZ/Z based on last compare
-  repne_scan();
-  // Not equal?
-  jcc(Assembler::notEqual, not_subtype);
+
+  // this part is kind tricky, as values in supers array could be 32 or 64 bit wide
+  // and we store values in objArrays always encoded, thus we need to encode value
+  // before repne
+  if (UseCompressedOops) {
+    encode_heap_oop(rax);
+    repne_scanl();
+    // Not equal?
+    jcc(Assembler::notEqual, not_subtype);
+    // decode heap oop here for movq
+    decode_heap_oop(rax);
+  } else {
+    repne_scanq();
+    jcc(Assembler::notEqual, not_subtype);
+  }
   // Must be equal but missed in cache.  Update cache.
   movq(Address(Rsub_klass, sizeof(oopDesc) +
                Klass::secondary_super_cache_offset_in_bytes()), rax);
   jmp(ok_is_subtype);
 
   bind(not_subtype);
+  // decode heap oop here for miss
+  if (UseCompressedOops) decode_heap_oop(rax);
   profile_typecheck_failed(rcx); // blows rcx
 }