https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109402
Bug ID: 109402
Summary: v850: non-v850e version of __muldi3() in
/libgcc/config/v850/lib1funcs.S operates sp in
reversed direction
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: t-hosh...@pony-e.jp
Target Milestone: ---
I have no idea to show a reproduce way in shortly.
Because a problem happens with inter-procedure such as interrupt service
routines which use storage in stack.
Where I talk about is:
in a commit 8b1204d7, /libgcc/config/v850/lib1funcs.S L2214, L2259.
There are stack-pointer operations.
I think these operations: shrink before, glowth after --- may reversed way.
There is one more consideration; this version of __muldi3() does not use
local storage in stack. So the problem will be resolved simply to remove
sp-operations.
In my environment, the next patch works well.
---
>From 1258506e0192fb0b9e5ce9e99fe88752ba7a5644 Tue, 4 Apr 2023 20:31:48 +0900
From: Hoshino Tetsuma <t-hosh...@pony-e.jp>
Date: Tue, 4 Apr 2023 19:25:03 +0900
Subject: [PATCH] remove improper stack-pointer operation
diff --git a/libgcc/config/v850/lib1funcs.S b/libgcc/config/v850/lib1funcs.S
index 00dd61d..99e79bf 100644
--- a/libgcc/config/v850/lib1funcs.S
+++ b/libgcc/config/v850/lib1funcs.S
@@ -2211,7 +2211,6 @@
___muldi3:
#ifdef __v850__
jarl __save_r26_r31, r10
- addi 16, sp, sp
mov r6, r28
shr 15, r28
movea lo(32767), r0, r14
@@ -2256,7 +2255,6 @@
mulh r12, r6
mov r28, r17
mulh r10, r17
- add -16, sp
mov r28, r12
mulh r8, r12
add r17, r18
