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Re: [x86 testsuite] preserve full register across main
- From: Alexandre Oliva <oliva at adacore dot com>
- To: Uros Bizjak <ubizjak at gmail dot com>
- Cc: "gcc-patches\@gcc.gnu.org" <gcc-patches at gcc dot gnu dot org>, Rainer Orth <ro at cebitec dot uni-bielefeld dot de>, Mike Stump <mikestump at comcast dot net>, Jan Hubicka <hubicka at ucw dot cz>
- Date: Tue, 03 Sep 2019 02:36:17 -0300
- Subject: Re: [x86 testsuite] preserve full register across main
- References: <orzhjz4uov.fsf@lxoliva.fsfla.org> <CAFULd4ayTq7CNvWpr2N__4PMw7RsOX8WVdMi_OQErNTDwXWiTg@mail.gmail.com>
On Aug 24, 2019, Uros Bizjak <ubizjak@gmail.com> wrote:
> Can __attribute__ ((mode (__word__))) be used here?
Oh, nice, yes, thanks!
> Otherwise OK.
Here's what I'm installing.
for gcc/testsuite/ChangeLog
* gcc.target/i386/20020616-1.c: Preserve full register across
main.
---
gcc/testsuite/gcc.target/i386/20020616-1.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/gcc/testsuite/gcc.target/i386/20020616-1.c b/gcc/testsuite/gcc.target/i386/20020616-1.c
index 5641826b4837c..48dea27956ce2 100644
--- a/gcc/testsuite/gcc.target/i386/20020616-1.c
+++ b/gcc/testsuite/gcc.target/i386/20020616-1.c
@@ -2,12 +2,16 @@
/* { dg-do run } */
/* { dg-options "-O2" } */
+/* We need this type to be as wide as the register chosen below, so
+ that, when we preserve it across main, we preserve all of it. */
+typedef int __attribute__ ((mode (__word__))) reg_type;
+
#if !__PIC__
-register int k asm("%ebx");
+register reg_type k asm("%ebx");
#elif __amd64
-register int k asm("%r12");
+register reg_type k asm("%r12");
#else
-register int k asm("%esi");
+register reg_type k asm("%esi");
#endif
void __attribute__((noinline))
@@ -18,7 +22,7 @@ foo()
void test()
{
- int i;
+ reg_type i;
for (i = 0; i < 10; i += k)
{
k = 0;
@@ -28,7 +32,7 @@ void test()
int main()
{
- int old = k;
+ reg_type old = k;
test();
k = old;
return 0;
--
Alexandre Oliva, freedom fighter he/him https://FSFLA.org/blogs/lxo
Be the change, be Free! FSF.org & FSF Latin America board member
GNU Toolchain Engineer Free Software Evangelist
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