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8379794: C2: UBSAN runtime error: shift exponent 64 is too large for 64-bit type 'long unsigned int'

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Reviewed-by: rcastanedalo, qamai, dlong
This commit is contained in:
Anton Seoane Ampudia 2026-03-27 09:44:37 +00:00 committed by Roberto Castañeda Lozano
parent 53c864a881
commit c0e500ad99
1 changed files with 6 additions and 2 deletions
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8
src/hotspot/cpu/x86/x86.ad
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@ -23972,8 +23972,12 @@ instruct vmask_gen_imm(kReg dst, immL len, rRegL temp) %{
format %{ "vector_mask_gen $len \t! vector mask generator" %}
effect(TEMP temp);
ins_encode %{
__ mov64($temp$$Register, (0xFFFFFFFFFFFFFFFFUL >> (64 -$len$$constant)));
__ kmovql($dst$$KRegister, $temp$$Register);
if ($len$$constant > 0) {
__ mov64($temp$$Register, right_n_bits($len$$constant));
__ kmovql($dst$$KRegister, $temp$$Register);
} else {
__ kxorql($dst$$KRegister, $dst$$KRegister, $dst$$KRegister);
}
%}
ins_pipe( pipe_slow );
%}