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Tighten condition for converting SUBREG reloads from OP_OUT to OP_INOUT 

gcc/
	PR target/78660
	* lra-constraints.c (curr_insn_transform): Tighten condition
	for converting SUBREG reloads from OP_OUT to OP_INOUT.

From-SVN: r245599
This commit is contained in:
Matthew Fortune 2017-02-20 12:07:06 +00:00 committed by Matthew Fortune
parent 222aafd7b6
commit 62cdb86264
2 changed files with 17 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-02-20 Matthew Fortune <matthew.fortune@imgtec.com>
PR target/78660
* lra-constraints.c (curr_insn_transform): Tighten condition
for converting SUBREG reloads from OP_OUT to OP_INOUT.
2017-02-20 Matthew Fortune <matthew.fortune@imgtec.com>
PR target/78660

12
gcc/lra-constraints.c
View File

@ -4140,7 +4140,17 @@ curr_insn_transform (bool check_only_p)
< GET_MODE_PRECISION (GET_MODE (reg))
&& WORD_REGISTER_OPERATIONS)))
{
if (type == OP_OUT)
/* An OP_INOUT is required when reloading a subreg of a
mode wider than a word to ensure that data beyond the
word being reloaded is preserved. Also automatically
ensure that strict_low_part reloads are made into
OP_INOUT which should already be true from the backend
constraints. */
if (type == OP_OUT
&& (curr_static_id->operand[i].strict_low
|| (GET_MODE_SIZE (GET_MODE (reg)) > UNITS_PER_WORD
&& (GET_MODE_SIZE (mode)
< GET_MODE_SIZE (GET_MODE (reg))))))
type = OP_INOUT;
loc = &SUBREG_REG (*loc);
mode = GET_MODE (*loc);