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: e58a1b3f0edce84103529b6761fc323be301ba07)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Khem Raj 2017-10-07 10:29:23 -07:00 committed by Richard Purdie
parent f7a6138589
commit fbf0a74537
2 changed files with 52 additions and 0 deletions

View File

@ -81,6 +81,7 @@ 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 = "\

View File

@ -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