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8261235: C1 compilation fails with assert(res->vreg_number() == index) failed: conversion check

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Reviewed-by: thartmann, kvn
This commit is contained in:
Christian Hagedorn 2021-02-17 09:00:39 +00:00
parent a9308705ff
commit 8418285530
6 changed files with 4150 additions and 15 deletions
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21
src/hotspot/share/c1/c1_LIRGenerator.cpp
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@ -1049,20 +1049,21 @@ void LIRGenerator::move_to_phi(ValueStack* cur_state) {
LIR_Opr LIRGenerator::new_register(BasicType type) {
int vreg = _virtual_register_number;
// add a little fudge factor for the bailout, since the bailout is
// only checked periodically. This gives a few extra registers to
// hand out before we really run out, which helps us keep from
// tripping over assertions.
if (vreg + 20 >= LIR_OprDesc::vreg_max) {
bailout("out of virtual registers");
if (vreg + 2 >= LIR_OprDesc::vreg_max) {
// wrap it around
int vreg_num = _virtual_register_number;
// Add a little fudge factor for the bailout since the bailout is only checked periodically. This allows us to hand out
// a few extra registers before we really run out which helps to avoid to trip over assertions.
if (vreg_num + 20 >= LIR_OprDesc::vreg_max) {
bailout("out of virtual registers in LIR generator");
if (vreg_num + 2 >= LIR_OprDesc::vreg_max) {
// Wrap it around and continue until bailout really happens to avoid hitting assertions.
_virtual_register_number = LIR_OprDesc::vreg_base;
vreg_num = LIR_OprDesc::vreg_base;
}
}
_virtual_register_number += 1;
return LIR_OprFact::virtual_register(vreg, type);
LIR_Opr vreg = LIR_OprFact::virtual_register(vreg_num, type);
assert(vreg != LIR_OprFact::illegal(), "ran out of virtual registers");
return vreg;
}