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gcc: merge small upstream change.

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Backport from mainline:
2007-04-24  Hui-May Chang <hm.chang@apple.com>

* reload1.c (merge_assigned_reloads) : Do not merge a RELOAD_OTHER
instruction with a RELOAD_FOR_OPERAND_ADDRESS instruction.

Obtained from:	gcc 4.3 (rev. r124115: GPLv2)
MFC after:	1 week
This commit is contained in:
Pedro F. Giffuni 2013-12-27 15:15:49 +00:00
parent 04aab884d7
commit 4707030025
2 changed files with 23 additions and 9 deletions
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5
contrib/gcc/ChangeLog.gcc43
View File

@ -151,6 +151,11 @@
alignment for amdfam10 architecture. Increasing the max loop
alignment to 24 bytes.
2007-04-24 Hui-May Chang <hm.chang@apple.com> (r124115)
* reload1.c (merge_assigned_reloads) : Do not merge a RELOAD_OTHER
instruction with a RELOAD_FOR_OPERAND_ADDRESS instruction.
2007-04-16 Lawrence Crowl <crowl@google.com> (r123909)
* doc/invoke.texi (Debugging Options): Add documentation for the

27
contrib/gcc/reload1.c
View File

@ -6238,15 +6238,23 @@ merge_assigned_reloads (rtx insn)
transfer_replacements (i, j);
}
/* If this is now RELOAD_OTHER, look for any reloads that load
parts of this operand and set them to RELOAD_FOR_OTHER_ADDRESS
if they were for inputs, RELOAD_OTHER for outputs. Note that
this test is equivalent to looking for reloads for this operand
number. */
/* We must take special care with RELOAD_FOR_OUTPUT_ADDRESS; it may
share registers with a RELOAD_FOR_INPUT, so we can not change it
to RELOAD_FOR_OTHER_ADDRESS. We should never need to, since we
do not modify RELOAD_FOR_OUTPUT. */
/* If this is now RELOAD_OTHER, look for any reloads that
load parts of this operand and set them to
RELOAD_FOR_OTHER_ADDRESS if they were for inputs,
RELOAD_OTHER for outputs. Note that this test is
equivalent to looking for reloads for this operand
number.
We must take special care with RELOAD_FOR_OUTPUT_ADDRESS;
it may share registers with a RELOAD_FOR_INPUT, so we can
not change it to RELOAD_FOR_OTHER_ADDRESS. We should
never need to, since we do not modify RELOAD_FOR_OUTPUT.
It is possible that the RELOAD_FOR_OPERAND_ADDRESS
instruction is assigned the same register as the earlier
RELOAD_FOR_OTHER_ADDRESS instruction. Merging these two
instructions will cause the RELOAD_FOR_OTHER_ADDRESS
instruction to be deleted later on. */
if (rld[i].when_needed == RELOAD_OTHER)
for (j = 0; j < n_reloads; j++)
@ -6254,6 +6262,7 @@ merge_assigned_reloads (rtx insn)
&& rld[j].when_needed != RELOAD_OTHER
&& rld[j].when_needed != RELOAD_FOR_OTHER_ADDRESS
&& rld[j].when_needed != RELOAD_FOR_OUTPUT_ADDRESS
&& rld[j].when_needed != RELOAD_FOR_OPERAND_ADDRESS
&& (! conflicting_input
|| rld[j].when_needed == RELOAD_FOR_INPUT_ADDRESS
|| rld[j].when_needed == RELOAD_FOR_INPADDR_ADDRESS)