From d0c02882a6ba8f5cebc2f5c90715770eeddd4675 Mon Sep 17 00:00:00 2001
From: hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 17 Dec 2014 14:22:57 +0000
Subject: Add -malign-data={abi|compat|cachineline}
Add -malign-data={abi|compat,cachineline} to control how GCC aligns
variables. "compat" uses increased alignment value compatible with
GCC 4.8 and earlier, "abi" uses alignment value as specified by the
psABI, and "cacheline" uses increased alignment value to match the
cache line size. "compat" is the default.
gcc/
PR target/61296
* config/i386/i386-opts.h (ix86_align_data): New enum.
* config/i386/i386.c (ix86_data_alignment): Return the ABI
alignment value for -malign-data=abi, the cachine line size
for -malign-data=cachineline and the older GCC compatible
alignment value for for -malign-data=compat.
* config/i386/i386.opt (malign-data=): New.
* doc/invoke.texi: Document -malign-data=.
gcc/testsuite/
PR target/61296
* gcc.target/i386/pr61296-2.c: New.
* gcc.target/i386/pr61296-2.c: Likewise.
* gcc.target/i386/pr61296-3.c: Likewise.
* gcc.target/i386/pr61296-4.c: Likewise.
* gcc.target/i386/pr61296-5.c: Likewise.
* gcc.target/i386/pr61296-6.c: Likewise.
* gcc.target/i386/pr61296-7.c: Likewise.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@218818 138bc75d-0d04-0410-961f-82ee72b054a4
---
gcc/doc/invoke.texi | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
(limited to 'gcc/doc')
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 19422d78cd1..15068da33e4 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -701,7 +701,7 @@ Objective-C and Objective-C++ Dialects}.
-m32 -m64 -mx32 -m16 -mlarge-data-threshold=@var{num} @gol
-msse2avx -mfentry -mrecord-mcount -mnop-mcount -m8bit-idiv @gol
-mavx256-split-unaligned-load -mavx256-split-unaligned-store @gol
--mstack-protector-guard=@var{guard}}
+-malign-data=@var{type} -mstack-protector-guard=@var{guard}}
@emph{i386 and x86-64 Windows Options}
@gccoptlist{-mconsole -mcygwin -mno-cygwin -mdll @gol
@@ -15682,6 +15682,14 @@ as well as modifying the function calling convention for functions taking
@code{long double}. Hence they are not binary-compatible
with code compiled without that switch.
+@item -malign-data=@var{type}
+@opindex malign-data
+Control how GCC aligns variables. Supported values for @var{type} are
+@samp{compat} uses increased alignment value compatible uses GCC 4.8
+and earlier, @samp{abi} uses alignment value as specified by the
+psABI, and @samp{cacheline} uses increased alignment value to match
+the cache line size. @samp{compat} is the default.
+
@item -mlarge-data-threshold=@var{threshold}
@opindex mlarge-data-threshold
When @option{-mcmodel=medium} is specified, data objects larger than
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