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comparison src/cpu/x86/vm/assembler_x86_64.hpp @ 168:7793bd37a336

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6705887: Compressed Oops: generate x64 addressing and implicit null checks with narrow oops Summary: Generate addresses and implicit null checks with narrow oops to avoid decoding. Reviewed-by: jrose, never
author kvn
date Thu, 29 May 2008 12:04:14 -0700
parents feeb96a45707
children 44abbb0d4c18
comparison
equal deleted inserted replaced
167:feeb96a45707 168:7793bd37a336
1026 // reg is NULL. If the accessed location is M[reg + offset] and the 1026 // reg is NULL. If the accessed location is M[reg + offset] and the
1027 // offset is known, provide the offset. No explicit code generation 1027 // offset is known, provide the offset. No explicit code generation
1028 // is needed if the offset is within a certain range (0 <= offset <= 1028 // is needed if the offset is within a certain range (0 <= offset <=
1029 // page_size). 1029 // page_size).
1030 void null_check(Register reg, int offset = -1); 1030 void null_check(Register reg, int offset = -1);
1031 static bool needs_explicit_null_check(int offset); 1031 static bool needs_explicit_null_check(intptr_t offset);
1032 1032
1033 // Required platform-specific helpers for Label::patch_instructions. 1033 // Required platform-specific helpers for Label::patch_instructions.
1034 // They _shadow_ the declarations in AbstractAssembler, which are undefined. 1034 // They _shadow_ the declarations in AbstractAssembler, which are undefined.
1035 void pd_patch_instruction(address branch, address target); 1035 void pd_patch_instruction(address branch, address target);
1036 #ifndef PRODUCT 1036 #ifndef PRODUCT