(struct resources): New field unch_memory.
(CLEAR_RESOURCES, mark_target_live_regs, dbr_schedule): Clear it. (mark_{referenced,set}_resources, redundant_insn): Set it. (fill_simple_delay_slots): Likewise. (resource_conflicts_p): Test it. From-SVN: r9860
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fd25a29a31
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14
gcc/reorg.c
14
gcc/reorg.c
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@ -162,6 +162,7 @@ static rtx *unfilled_firstobj;
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struct resources
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{
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char memory; /* Insn sets or needs a memory location. */
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char unch_memory; /* Insn sets of needs a "unchanging" MEM. */
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char volatil; /* Insn sets or needs a volatile memory loc. */
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char cc; /* Insn sets or needs the condition codes. */
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HARD_REG_SET regs; /* Which registers are set or needed. */
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@ -169,7 +170,7 @@ struct resources
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/* Macro to clear all resources. */
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#define CLEAR_RESOURCE(RES) \
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do { (RES)->memory = (RES)->volatil = (RES)->cc = 0; \
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do { (RES)->memory = (RES)->unch_memory = (RES)->volatil = (RES)->cc = 0; \
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CLEAR_HARD_REG_SET ((RES)->regs); } while (0)
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/* Indicates what resources are required at the beginning of the epilogue. */
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@ -310,7 +311,9 @@ mark_referenced_resources (x, res, include_delayed_effects)
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case MEM:
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/* If this memory shouldn't change, it really isn't referencing
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memory. */
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if (! RTX_UNCHANGING_P (x))
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if (RTX_UNCHANGING_P (x))
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res->unch_memory = 1;
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else
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res->memory = 1;
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res->volatil = MEM_VOLATILE_P (x);
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@ -616,6 +619,7 @@ mark_set_resources (x, res, in_dest, include_delayed_effects)
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if (in_dest)
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{
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res->memory = 1;
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res->unch_memory = RTX_UNCHANGING_P (x);
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res->volatil = MEM_VOLATILE_P (x);
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}
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@ -707,6 +711,7 @@ resource_conflicts_p (res1, res2)
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struct resources *res1, *res2;
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{
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if ((res1->cc && res2->cc) || (res1->memory && res2->memory)
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|| (res1->unch_memory && res2->unch_memory)
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|| res1->volatil || res2->volatil)
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return 1;
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@ -2033,6 +2038,7 @@ redundant_insn (insn, target, delay_list)
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/* Insns we pass may not set either NEEDED or SET, so merge them for
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simpler tests. */
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needed.memory |= set.memory;
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needed.unch_memory |= set.unch_memory;
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IOR_HARD_REG_SET (needed.regs, set.regs);
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/* This insn isn't redundant if it conflicts with an insn that either is
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@ -2454,7 +2460,7 @@ mark_target_live_regs (target, res)
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/* We have to assume memory is needed, but the CC isn't. */
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res->memory = 1;
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res->volatil = 0;
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res->volatil = res->unch_memory = 0;
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res->cc = 0;
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/* See if we have computed this value already. */
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@ -3053,6 +3059,7 @@ fill_simple_delay_slots (first, non_jumps_p)
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(next_active_insn (JUMP_LABEL (trial_delay)),
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&needed_at_jump);
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needed.memory |= needed_at_jump.memory;
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needed.unch_memory |= needed_at_jump.unch_memory;
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IOR_HARD_REG_SET (needed.regs, needed_at_jump.regs);
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}
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}
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@ -4260,6 +4267,7 @@ dbr_schedule (first, file)
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end_of_function_needs.cc = 0;
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end_of_function_needs.memory = 1;
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end_of_function_needs.unch_memory = 0;
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CLEAR_HARD_REG_SET (end_of_function_needs.regs);
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if (frame_pointer_needed)
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