1.1 --- a/src/cpu/sparc/vm/assembler_sparc.cpp Mon Sep 14 09:49:54 2009 -0700
1.2 +++ b/src/cpu/sparc/vm/assembler_sparc.cpp Mon Sep 14 12:14:20 2009 -0700
1.3 @@ -4676,3 +4676,50 @@
1.4 load_ptr_contents(base, G6_heapbase);
1.5 }
1.6 }
1.7 +
1.8 +// Compare char[] arrays aligned to 4 bytes.
1.9 +void MacroAssembler::char_arrays_equals(Register ary1, Register ary2,
1.10 + Register limit, Register result,
1.11 + Register chr1, Register chr2, Label& Ldone) {
1.12 + Label Lvector, Lloop;
1.13 + assert(chr1 == result, "should be the same");
1.14 +
1.15 + // Note: limit contains number of bytes (2*char_elements) != 0.
1.16 + andcc(limit, 0x2, chr1); // trailing character ?
1.17 + br(Assembler::zero, false, Assembler::pt, Lvector);
1.18 + delayed()->nop();
1.19 +
1.20 + // compare the trailing char
1.21 + sub(limit, sizeof(jchar), limit);
1.22 + lduh(ary1, limit, chr1);
1.23 + lduh(ary2, limit, chr2);
1.24 + cmp(chr1, chr2);
1.25 + br(Assembler::notEqual, true, Assembler::pt, Ldone);
1.26 + delayed()->mov(G0, result); // not equal
1.27 +
1.28 + // only one char ?
1.29 + br_on_reg_cond(rc_z, true, Assembler::pn, limit, Ldone);
1.30 + delayed()->add(G0, 1, result); // zero-length arrays are equal
1.31 +
1.32 + // word by word compare, dont't need alignment check
1.33 + bind(Lvector);
1.34 + // Shift ary1 and ary2 to the end of the arrays, negate limit
1.35 + add(ary1, limit, ary1);
1.36 + add(ary2, limit, ary2);
1.37 + neg(limit, limit);
1.38 +
1.39 + lduw(ary1, limit, chr1);
1.40 + bind(Lloop);
1.41 + lduw(ary2, limit, chr2);
1.42 + cmp(chr1, chr2);
1.43 + br(Assembler::notEqual, true, Assembler::pt, Ldone);
1.44 + delayed()->mov(G0, result); // not equal
1.45 + inccc(limit, 2*sizeof(jchar));
1.46 + // annul LDUW if branch is not taken to prevent access past end of array
1.47 + br(Assembler::notZero, true, Assembler::pt, Lloop);
1.48 + delayed()->lduw(ary1, limit, chr1); // hoisted
1.49 +
1.50 + // Caller should set it:
1.51 + // add(G0, 1, result); // equals
1.52 +}
1.53 +
