1 files changed, 52 insertions, 0 deletions

diff --git a/meta/recipes-devtools/gcc/gcc-7.2/0001-PR-rtl-optimization-81803.patch b/meta/recipes-devtools/gcc/gcc-7.2/0001-PR-rtl-optimization-81803.patch
new file mode 100644
index 0000000000..292e734a2f
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc-7.2/0001-PR-rtl-optimization-81803.patch
@@ -0,0 +1,52 @@
+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
+