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8389312: RISC-V: vector_update_crc32 wrongly assumes undisturbed tail elements

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Reviewed-by: fyang, dzhang
This commit is contained in:
Gui Cao 2026-08-01 03:05:13 +00:00 committed by Fei Yang
parent add59ed298
commit 4a6718b062
1 changed files with 3 additions and 3 deletions
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6
src/hotspot/cpu/riscv/macroAssembler_riscv.cpp
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@ -2174,12 +2174,12 @@ void MacroAssembler::vector_update_crc32(Register crc, Register buf, Register le
mv(tmp5, 0xff);
if (MaxVectorSize == 16) {
vsetivli(zr, N, Assembler::e32, Assembler::m4, Assembler::ma, Assembler::ta);
vsetivli(zr, N, Assembler::e32, Assembler::m4, Assembler::mu, Assembler::tu);
} else if (MaxVectorSize == 32) {
vsetivli(zr, N, Assembler::e32, Assembler::m2, Assembler::ma, Assembler::ta);
vsetivli(zr, N, Assembler::e32, Assembler::m2, Assembler::mu, Assembler::tu);
} else {
assert(MaxVectorSize > 32, "sanity");
vsetivli(zr, N, Assembler::e32, Assembler::m1, Assembler::ma, Assembler::ta);
vsetivli(zr, N, Assembler::e32, Assembler::m1, Assembler::mu, Assembler::tu);
}
vmv_v_x(vcrc, zr);