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