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To: GNU C Library <libc-alpha@sourceware.org>
From: Stefan Liebler <stli@linux.ibm.com>
Subject: [PATCH] S390: Increase function alignment to 16 bytes.
Date: Fri, 1 Mar 2019 16:37:00 +0100
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Message-Id: <df4b46f9-3e30-a77a-83d5-c90f1d1054db@linux.ibm.com>

Hi,

this patch sets the default function alignment to 16 bytes in order to
get rid of some unwanted performance effects.

Please see also GCC commit "S/390: Set default function
alignment to 16."

Bye,
Stefan

ChangeLog:

	* sysdeps/s390/s390-64/sysdep.h(ENTRY): Use alignment of 16byte.
	* sysdeps/s390/s390-32/sysdep.h: Likewise.

commit 3ca7542058593c6870ca10d0eed801ccc4326a4c
Author: Stefan Liebler <stli@linux.ibm.com>
Date:   Wed Feb 20 09:02:56 2019 +0100

    S390: Increase function alignment to 16 bytes.
    
    Set the default function alignment to 16 bytes in order to
    get rid of some unwanted performance effects.
    
    Please see also GCC commit "S/390: Set default function
    alignment to 16."
    
    ChangeLog:
    
            * sysdeps/s390/s390-64/sysdep.h(ENTRY): Use alignment of 16byte.
            * sysdeps/s390/s390-32/sysdep.h: Likewise.

diff --git a/sysdeps/s390/s390-32/sysdep.h b/sysdeps/s390/s390-32/sysdep.h
index 6605dde237..4a441e1204 100644
--- a/sysdeps/s390/s390-32/sysdep.h
+++ b/sysdeps/s390/s390-32/sysdep.h
@@ -32,7 +32,7 @@
 #define	ENTRY(name)							      \
   .globl C_SYMBOL_NAME(name);						      \
   .type C_SYMBOL_NAME(name),@function;					      \
-  .align ALIGNARG(2);							      \
+  .align ALIGNARG(4);							      \
   C_LABEL(name)								      \
   cfi_startproc;							      \
   CALL_MCOUNT
diff --git a/sysdeps/s390/s390-64/sysdep.h b/sysdeps/s390/s390-64/sysdep.h
index 99dbf3f444..0531fa5823 100644
--- a/sysdeps/s390/s390-64/sysdep.h
+++ b/sysdeps/s390/s390-64/sysdep.h
@@ -32,7 +32,7 @@
 #define	ENTRY(name)							      \
   .globl C_SYMBOL_NAME(name);						      \
   .type C_SYMBOL_NAME(name),@function;					      \
-  .align ALIGNARG(2);							      \
+  .align ALIGNARG(4);							      \
   C_LABEL(name)								      \
   cfi_startproc;							      \
   CALL_MCOUNT