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8378353: [PPC64] StringCoding.countPositives causes errors when the length is not a proper 32 bit int

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Reviewed-by: mbaesken, dbriemann
This commit is contained in:
Martin Doerr 2026-02-23 13:00:00 +00:00
parent 9ea62c258c
commit aee4b02ecd
1 changed files with 5 additions and 3 deletions
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8
src/hotspot/cpu/ppc/c2_MacroAssembler_ppc.cpp
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@ -600,19 +600,21 @@ void C2_MacroAssembler::count_positives(Register src, Register cnt, Register res
orr(tmp0, tmp2, tmp0);
and_(tmp0, tmp0, tmp1);
bne(CR0, Lslow); // Found negative byte.
bne(CR0, Lslow); // Found negative byte.
addi(result, result, 16);
bdnz(Lfastloop);
bind(Lslow); // Fallback to slow version.
subf(tmp0, src, result); // Bytes known positive.
subf_(tmp0, tmp0, cnt); // Remaining Bytes.
clrldi(tmp1, cnt, 32); // Clear garbage from upper 32 bits.
subf_(tmp0, tmp0, tmp1); // Remaining Bytes.
beq(CR0, Ldone);
mtctr(tmp0);
bind(Lloop);
lbz(tmp0, 0, result);
andi_(tmp0, tmp0, 0x80);
bne(CR0, Ldone); // Found negative byte.
bne(CR0, Ldone); // Found negative byte.
addi(result, result, 1);
bdnz(Lloop);