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gcc: fix miscompilation on mips64

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We've observed strange behaviour of `systemctl status <xxx> on qemumips64.
The output of the command is like `systemctl show <xxx>', which is incorrect.

This patch is from gcc bugzilla's attachment.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81803

The patch hasn't been merged into gcc. But it does solve the above problem.

(From OE-Core rev: 3717c76eb24217c14a22f72fdd8732923729dee8)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Chen Qi
2017-10-27 17:43:51 +08:00
committed by Richard Purdie
parent af34166d38
commit b656fd9267
2 changed files with 36 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
meta/recipes-devtools/gcc/gcc-7.2.inc
+1
View File
@@ -75,6 +75,7 @@ SRC_URI = "\
file://0048-gcc-Enable-static-PIE.patch \
file://fix-segmentation-fault-precompiled-hdr.patch \
file://0050-RISC-V-Handle-non-legitimate-address-in-riscv_legiti.patch \
file://fix-miscompilation-for-O1-on-mips64el.patch \
${BACKPORTS} \
"
BACKPORTS = "\
meta/recipes-devtools/gcc/gcc-7.2/fix-miscompilation-for-O1-on-mips64el.patch
+35
View File
@@ -0,0 +1,35 @@
This patch comes from https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81803
Author: mpf <mpf@138bc75d-0d04-0410-961f-82ee72b054a4>
This patch hasn't been merged into gcc. But it does solve the problem of
strange behaviour of `systemd status <xxx>' on qemumips64.
Upstream-Status: Pending [Taken from gcc bugzilla's attachment]
Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
gcc/lra-constraints.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c
index c8bc9b9a66f..6d319662b09 100644
--- a/gcc/lra-constraints.c
+++ b/gcc/lra-constraints.c
@@ -4235,7 +4235,12 @@ 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))))
+ || (type != OP_IN
+ && 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