[gnome-continuous-yocto/gnomeostree-3.28-rocko: 7997/8267] gcc-6.3: Backport patch to fix ICE on ARM

[Emmanuele Bassi <ebassi src gnome org>]

commit 29b0f2c08fce18d90ff68e2ced1c05b041204848
Author: Khem Raj <raj khem gmail com>
Date:   Sat Oct 7 10:29:23 2017 -0700

    gcc-6.3: Backport patch to fix ICE on ARM
    
    Fixes
    internal compiler error: Max. number of generated reload insns per insn is achieved (90)
    
    (From OE-Core rev: d2631f45a057c53797b7ba657662f35f66a2b04e)
    
    Signed-off-by: Khem Raj <raj khem gmail com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/recipes-devtools/gcc/gcc-6.3.inc              |    1 +
 ...-relax-the-restriction-on-subreg-reload-f.patch |   51 ++++++++++++++++++++
 2 files changed, 52 insertions(+), 0 deletions(-)
---
diff --git a/meta/recipes-devtools/gcc/gcc-6.3.inc b/meta/recipes-devtools/gcc/gcc-6.3.inc
index ec6d8cd..e569e02 100644
--- a/meta/recipes-devtools/gcc/gcc-6.3.inc
+++ b/meta/recipes-devtools/gcc/gcc-6.3.inc
@@ -75,6 +75,7 @@ SRC_URI = "\
            file://0048-sync-gcc-stddef.h-with-musl.patch \
            file://0054_all_nopie-all-flags.patch \
            file://0055-unwind_h-glibc26.patch \
+           file://0056-LRA-PR70904-relax-the-restriction-on-subreg-reload-f.patch \
            ${BACKPORTS} \
 "
 BACKPORTS = "\
diff --git 
a/meta/recipes-devtools/gcc/gcc-6.3/0056-LRA-PR70904-relax-the-restriction-on-subreg-reload-f.patch 
b/meta/recipes-devtools/gcc/gcc-6.3/0056-LRA-PR70904-relax-the-restriction-on-subreg-reload-f.patch
new file mode 100644
index 0000000..231f147
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc-6.3/0056-LRA-PR70904-relax-the-restriction-on-subreg-reload-f.patch
@@ -0,0 +1,51 @@
+From a582b0a53d1dc8604a201348b99ca8de48784e7e Mon Sep 17 00:00:00 2001
+From: jiwang <jiwang@138bc75d-0d04-0410-961f-82ee72b054a4>
+Date: Thu, 12 May 2016 17:00:52 +0000
+Subject: [PATCH] [LRA] PR70904, relax the restriction on subreg reload for
+ wide mode
+
+2016-05-12  Jiong Wang  <jiong wang arm com>
+
+gcc/
+  PR rtl-optimization/70904
+  * lra-constraint.c (process_addr_reg): Relax the restriction on
+  subreg reload for wide mode.
+
+git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@236181 138bc75d-0d04-0410-961f-82ee72b054a4
+---
+Upstream-Status: Backport
+Signed-off-by: Khem Raj <raj khem gmail com>
+
+ gcc/lra-constraints.c | 16 +++++++++++++++-
+ 1 file changed, 15 insertions(+), 1 deletion(-)
+
+diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c
+index f96fd458e23..73fb72a2ea5 100644
+--- a/gcc/lra-constraints.c
++++ b/gcc/lra-constraints.c
+@@ -1326,7 +1326,21 @@ process_addr_reg (rtx *loc, bool check_only_p, rtx_insn **before, rtx_insn **aft
+ 
+   subreg_p = GET_CODE (*loc) == SUBREG;
+   if (subreg_p)
+-    loc = &SUBREG_REG (*loc);
++    {
++      reg = SUBREG_REG (*loc);
++      mode = GET_MODE (reg);
++
++      /* For mode with size bigger than ptr_mode, there unlikely to be "mov"
++       between two registers with different classes, but there normally will
++       be "mov" which transfers element of vector register into the general
++       register, and this normally will be a subreg which should be reloaded
++       as a whole.  This is particularly likely to be triggered when
++       -fno-split-wide-types specified.  */
++      if (in_class_p (reg, cl, &new_class)
++        || GET_MODE_SIZE (mode) <= GET_MODE_SIZE (ptr_mode))
++       loc = &SUBREG_REG (*loc);
++    }
++
+   reg = *loc;
+   mode = GET_MODE (reg);
+   if (! REG_P (reg))
+-- 
+2.14.2
+