[LRA] Don't make eliminable registers live (PR91957)
One effect of https://gcc.gnu.org/ml/gcc-patches/2019-09/msg00802.html was to strengthen the sanity check in lra_assigns so that it checks whether reg_renumber is consistent with the whole conflict set. This duly tripped on csky for a pseudo that had been allocated to the eliminated frame pointer. (csky doesn't have a separate hard frame pointer.) lra-lives uses: /* Set of hard regs (except eliminable ones) currently live. */ static HARD_REG_SET hard_regs_live; to track the set of live directly-referenced hard registers, and it correctly implements the exclusion when setting up the initial set: hard_regs_live &= ~eliminable_regset; But later calls to make_hard_regno_live and make_hard_regno_dead would process eliminable registers like other registers, recording conflicts for them and potentially making them live. (Note that after r266086, make_hard_regno_dead adds conflicts for registers that are already marked dead.) I think this would have had the effect of pessimising targets without a separate hard frame pointer. 2019-10-02 Richard Sandiford <richard.sandiford@arm.com> gcc/ PR middle-end/91957 * lra-lives.c (make_hard_regno_dead): Don't record conflicts for eliminable registers. (make_hard_regno_live): Likewise, and don't make them live. From-SVN: r276440
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2019-10-02 Richard Sandiford <richard.sandiford@arm.com>
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PR middle-end/91957
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* lra-lives.c (make_hard_regno_dead): Don't record conflicts for
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eliminable registers.
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(make_hard_regno_live): Likewise, and don't make them live.
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2019-10-01 David Malcolm <dmalcolm@redhat.com>
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* diagnostic-show-locus.c (layout::print_gap_in_line_numbering):
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@ -281,7 +281,8 @@ static void
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make_hard_regno_live (int regno)
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{
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lra_assert (HARD_REGISTER_NUM_P (regno));
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if (TEST_HARD_REG_BIT (hard_regs_live, regno))
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if (TEST_HARD_REG_BIT (hard_regs_live, regno)
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|| TEST_HARD_REG_BIT (eliminable_regset, regno))
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return;
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SET_HARD_REG_BIT (hard_regs_live, regno);
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sparseset_set_bit (start_living, regno);
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@ -295,6 +296,9 @@ make_hard_regno_live (int regno)
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static void
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make_hard_regno_dead (int regno)
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{
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if (TEST_HARD_REG_BIT (eliminable_regset, regno))
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return;
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lra_assert (HARD_REGISTER_NUM_P (regno));
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unsigned int i;
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EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, i)
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