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comparison src/cpu/x86/vm/assembler_x86_32.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 3d62cb85208d
children d1605aabd0a1 6aae2f9d0294
comparison
equal deleted inserted replaced
167:feeb96a45707 168:7793bd37a336
1052 // If the accessed location is M[reg + offset] and the offset is known, provide the 1052 // If the accessed location is M[reg + offset] and the offset is known, provide the
1053 // offset. No explicit code generation is needed if the offset is within a certain 1053 // offset. No explicit code generation is needed if the offset is within a certain
1054 // range (0 <= offset <= page_size). 1054 // range (0 <= offset <= page_size).
1055 1055
1056 void null_check(Register reg, int offset = -1); 1056 void null_check(Register reg, int offset = -1);
1057 static bool needs_explicit_null_check(int offset); 1057 static bool needs_explicit_null_check(intptr_t offset);
1058 1058
1059 // Required platform-specific helpers for Label::patch_instructions. 1059 // Required platform-specific helpers for Label::patch_instructions.
1060 // They _shadow_ the declarations in AbstractAssembler, which are undefined. 1060 // They _shadow_ the declarations in AbstractAssembler, which are undefined.
1061 void pd_patch_instruction(address branch, address target); 1061 void pd_patch_instruction(address branch, address target);
1062 #ifndef PRODUCT 1062 #ifndef PRODUCT