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(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
This commit is contained in:
Richard Kenner 1995-05-31 21:13:57 -04:00
parent fd25a29a31
commit 8eae5ed6cd
1 changed files with 11 additions and 3 deletions
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14
gcc/reorg.c
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@ -162,6 +162,7 @@ static rtx *unfilled_firstobj;
struct resources struct resources
{ {
char memory; /* Insn sets or needs a memory location. */ char memory; /* Insn sets or needs a memory location. */
char unch_memory; /* Insn sets of needs a "unchanging" MEM. */
char volatil; /* Insn sets or needs a volatile memory loc. */ char volatil; /* Insn sets or needs a volatile memory loc. */
char cc; /* Insn sets or needs the condition codes. */ char cc; /* Insn sets or needs the condition codes. */
HARD_REG_SET regs; /* Which registers are set or needed. */ HARD_REG_SET regs; /* Which registers are set or needed. */
@ -169,7 +170,7 @@ struct resources
/* Macro to clear all resources. */ /* Macro to clear all resources. */
#define CLEAR_RESOURCE(RES) \ #define CLEAR_RESOURCE(RES) \
do { (RES)->memory = (RES)->volatil = (RES)->cc = 0; \ do { (RES)->memory = (RES)->unch_memory = (RES)->volatil = (RES)->cc = 0; \
CLEAR_HARD_REG_SET ((RES)->regs); } while (0) CLEAR_HARD_REG_SET ((RES)->regs); } while (0)
/* Indicates what resources are required at the beginning of the epilogue. */ /* Indicates what resources are required at the beginning of the epilogue. */
@ -310,7 +311,9 @@ mark_referenced_resources (x, res, include_delayed_effects)
case MEM: case MEM:
/* If this memory shouldn't change, it really isn't referencing /* If this memory shouldn't change, it really isn't referencing
memory. */ memory. */
if (! RTX_UNCHANGING_P (x)) if (RTX_UNCHANGING_P (x))
res->unch_memory = 1;
else
res->memory = 1; res->memory = 1;
res->volatil = MEM_VOLATILE_P (x); res->volatil = MEM_VOLATILE_P (x);
@ -616,6 +619,7 @@ mark_set_resources (x, res, in_dest, include_delayed_effects)
if (in_dest) if (in_dest)
{ {
res->memory = 1; res->memory = 1;
res->unch_memory = RTX_UNCHANGING_P (x);
res->volatil = MEM_VOLATILE_P (x); res->volatil = MEM_VOLATILE_P (x);
} }
@ -707,6 +711,7 @@ resource_conflicts_p (res1, res2)
struct resources *res1, *res2; struct resources *res1, *res2;
{ {
if ((res1->cc && res2->cc) || (res1->memory && res2->memory) if ((res1->cc && res2->cc) || (res1->memory && res2->memory)
|| (res1->unch_memory && res2->unch_memory)
|| res1->volatil || res2->volatil) || res1->volatil || res2->volatil)
return 1; return 1;
@ -2033,6 +2038,7 @@ redundant_insn (insn, target, delay_list)
/* Insns we pass may not set either NEEDED or SET, so merge them for /* Insns we pass may not set either NEEDED or SET, so merge them for
simpler tests. */ simpler tests. */
needed.memory |= set.memory; needed.memory |= set.memory;
needed.unch_memory |= set.unch_memory;
IOR_HARD_REG_SET (needed.regs, set.regs); IOR_HARD_REG_SET (needed.regs, set.regs);
/* This insn isn't redundant if it conflicts with an insn that either is /* This insn isn't redundant if it conflicts with an insn that either is
@ -2454,7 +2460,7 @@ mark_target_live_regs (target, res)
/* We have to assume memory is needed, but the CC isn't. */ /* We have to assume memory is needed, but the CC isn't. */
res->memory = 1; res->memory = 1;
res->volatil = 0; res->volatil = res->unch_memory = 0;
res->cc = 0; res->cc = 0;
/* See if we have computed this value already. */ /* See if we have computed this value already. */
@ -3053,6 +3059,7 @@ fill_simple_delay_slots (first, non_jumps_p)
(next_active_insn (JUMP_LABEL (trial_delay)), (next_active_insn (JUMP_LABEL (trial_delay)),
&needed_at_jump); &needed_at_jump);
needed.memory |= needed_at_jump.memory; needed.memory |= needed_at_jump.memory;
needed.unch_memory |= needed_at_jump.unch_memory;
IOR_HARD_REG_SET (needed.regs, needed_at_jump.regs); IOR_HARD_REG_SET (needed.regs, needed_at_jump.regs);
} }
} }
@ -4260,6 +4267,7 @@ dbr_schedule (first, file)
end_of_function_needs.cc = 0; end_of_function_needs.cc = 0;
end_of_function_needs.memory = 1; end_of_function_needs.memory = 1;
end_of_function_needs.unch_memory = 0;
CLEAR_HARD_REG_SET (end_of_function_needs.regs); CLEAR_HARD_REG_SET (end_of_function_needs.regs);
if (frame_pointer_needed) if (frame_pointer_needed)