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From 5cbb8e6b1122092b3eaabd4270b2f316aa40407c Mon Sep 17 00:00:00 2001
From: ebotcazou <ebotcazou@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue, 31 Oct 2017 18:27:52 +0000
Subject: [PATCH] PR rtl-optimization/81803 * lra-constraints.c
(curr_insn_transform): Also reload the whole register for a strict subreg
no wider than a word if this is for a WORD_REGISTER_OPERATIONS target.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@254275 138bc75d-0d04-0410-961f-82ee72b054a4
Upstream-Status: Backport
This patch removes changes to Changelog from the original patch upstream. This is
because we are backporting a patch to a stable version, making changes to Changelog,
especially up '* GCC 7.2.0 released.', feels a little weird.
Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
gcc/lra-constraints.c | 11 ++++++++---
2 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c
index a423f069836..3758409bb9c 100644
--- a/gcc/lra-constraints.c
+++ b/gcc/lra-constraints.c
@@ -4207,8 +4207,9 @@ curr_insn_transform (bool check_only_p)
reg = SUBREG_REG (*loc);
byte = SUBREG_BYTE (*loc);
if (REG_P (reg)
- /* Strict_low_part requires reload the register not
- the sub-register. */
+ /* Strict_low_part requires reloading the register and not
+ just the subreg. Likewise for a strict subreg no wider
+ than a word for WORD_REGISTER_OPERATIONS targets. */
&& (curr_static_id->operand[i].strict_low
|| (!paradoxical_subreg_p (mode, GET_MODE (reg))
&& (hard_regno
@@ -4219,7 +4220,11 @@ curr_insn_transform (bool check_only_p)
&& (goal_alt[i] == NO_REGS
|| (simplify_subreg_regno
(ira_class_hard_regs[goal_alt[i]][0],
- GET_MODE (reg), byte, mode) >= 0)))))
+ GET_MODE (reg), byte, mode) >= 0)))
+ || (GET_MODE_PRECISION (mode)
+ < GET_MODE_PRECISION (GET_MODE (reg))
+ && GET_MODE_SIZE (GET_MODE (reg)) <= UNITS_PER_WORD
+ && WORD_REGISTER_OPERATIONS)))
{
/* An OP_INOUT is required when reloading a subreg of a
mode wider than a word to ensure that data beyond the
--
2.13.0
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