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Backport a change to the 2.95 branch

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From-SVN: r37888
This commit is contained in:
Bernd Schmidt
2000-11-30 12:57:46 +00:00
committed by Bernd Schmidt
parent 3f3fdff8fb
commit 82b2067482
2 changed files with 22 additions and 0 deletions
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5
gcc/ChangeLog
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@@ -1,5 +1,10 @@
2000-11-30 Bernd Schmidt <bernds@redhat.co.uk>
2000-11-24 Bernd Schmidt <bernds@redhat.co.uk>
* reload1.c (conflicts_with_override): New function.
(emit_input_reload_insns): Use it to tighten test for validity
of substituting into output of previous insn.
Wed Oct 27 03:09:23 1999 J"orn Rennecke <amylaar@redhat.co.uk>
* reload.h (earlyclobber_operand_p): Declare.
* reload.c (earlyclobber_operand_p): Don't declare. No longer static.

17
gcc/reload1.c
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@@ -423,6 +423,7 @@ static int reload_reg_free_for_value_p PROTO((int, int, enum reload_type, rtx, r
static int reload_reg_reaches_end_p PROTO((int, int, enum reload_type));
static int allocate_reload_reg PROTO((struct insn_chain *, int, int,
int));
static int conflicts_with_override PROTO((rtx));
static void choose_reload_regs PROTO((struct insn_chain *));
static void merge_assigned_reloads PROTO((rtx));
static void emit_reload_insns PROTO((struct insn_chain *));
@@ -5412,6 +5413,21 @@ reload_reg_free_for_value_p (regno, opnum, type, value, out, reloadnum,
return 1;
}
/* Determine whether the reload reg X overlaps any rtx'es used for
overriding inheritance. Return nonzero if so. */
static int
conflicts_with_override (x)
rtx x;
{
int i;
for (i = 0; i < n_reloads; i++)
if (reload_override_in[i]
&& reg_overlap_mentioned_p (x, reload_override_in[i]))
return 1;
return 0;
}
/* Find a spill register to use as a reload register for reload R.
LAST_RELOAD is non-zero if this is the last reload for the insn being
processed.
@@ -6819,6 +6835,7 @@ emit_reload_insns (chain)
&& dead_or_set_p (insn, old)
/* This is unsafe if some other reload
uses the same reg first. */
&& ! conflicts_with_override (reloadreg)
&& reload_reg_free_for_value_p (REGNO (reloadreg),
reload_opnum[j],
reload_when_needed[j],