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re PR middle-end/91708 ([ARM] Bootstrap fails in gen_movsi, at config/arm/arm.md:5258)

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2019-09-13  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        PR middle-end/91708
        * cse.c (cse_insn): Do not replace anything with a
        MEM.

From-SVN: r275701
This commit is contained in:
Bernd Edlinger 2019-09-13 17:22:04 +00:00 committed by Bernd Edlinger
parent 57cccc860e
commit 2374137476
2 changed files with 12 additions and 17 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2019-09-13 Bernd Edlinger <bernd.edlinger@hotmail.de>
PR middle-end/91708
* cse.c (cse_insn): Do not replace anything with a
MEM.
2019-09-13 Ian Lance Taylor <iant@golang.org>
* doc/invoke.texi (Optimize Options): Fix typo.

23
gcc/cse.c
View File

@ -5238,23 +5238,6 @@ cse_insn (rtx_insn *insn)
src_elt_cost = MAX_COST;
}
/* Avoid creation of overlapping memory moves. */
if (MEM_P (trial) && MEM_P (dest) && !rtx_equal_p (trial, dest))
{
rtx src, dest;
/* BLKmode moves are not handled by cse anyway. */
if (GET_MODE (trial) == BLKmode)
break;
src = canon_rtx (trial);
dest = canon_rtx (SET_DEST (sets[i].rtl));
if (!MEM_P (src) || !MEM_P (dest)
|| !nonoverlapping_memrefs_p (src, dest, false))
break;
}
/* Try to optimize
(set (reg:M N) (const_int A))
(set (reg:M2 O) (const_int B))
@ -5385,6 +5368,12 @@ cse_insn (rtx_insn *insn)
/* Do nothing for this case. */
;
/* Do not replace anything with a MEM, except the replacement
is a no-op. This allows this loop to terminate. */
else if (MEM_P (trial) && !rtx_equal_p (trial, SET_SRC(sets[i].rtl)))
/* Do nothing for this case. */
;
/* Look for a substitution that makes a valid insn. */
else if (validate_unshare_change (insn, &SET_SRC (sets[i].rtl),
trial, 0))