From: Hans-Peter Nilsson <hp@bitrange.com>
To: Andrew MacLeod <amacleod@redhat.com>
Cc: "Joseph S. Myers" <joseph@codesourcery.com>, gcc-patches@gcc.gnu.org
Subject: Re: Implement C11 _Atomic
Date: Fri, 22 Nov 2013 02:57:00 -0000 [thread overview]
Message-ID: <alpine.BSF.2.02.1311211758050.26167@arjuna.pair.com> (raw)
In-Reply-To: <528E2CB6.7020104@redhat.com>
[-- Attachment #1: Type: TEXT/PLAIN, Size: 737 bytes --]
On Thu, 21 Nov 2013, Andrew MacLeod wrote:
> I can bootstrap and check this on x86 to make sure it doesnt affect anything,
> and you can fool with it and see if you can get your desired results with your
> port.
Success!
For the record, tested together with the attached patch for the
CRIS ports, both regularly (not finished, but done with the C
testsuite part and no regressions there), as well as manually
for the attached test-programs, compiling and inspecting output
for different sub-targets and checking that data layout,
alignment and size is as intended.
Too bad about the libstdc++ atomics, but with this/these patches
at least I'll be able to tell people that _Atomic for C11 works.
Thanks to the both of you!
brgds, H-P
[-- Attachment #2: Type: TEXT/PLAIN, Size: 1377 bytes --]
Index: config/cris/cris.c
===================================================================
--- config/cris/cris.c (revision 205225)
+++ config/cris/cris.c (working copy)
@@ -93,6 +93,8 @@ static int cris_reg_overlap_mentioned_p
static enum machine_mode cris_promote_function_mode (const_tree, enum machine_mode,
int *, const_tree, int);
+static unsigned int cris_atomic_align_for_mode (enum machine_mode);
+
static void cris_print_base (rtx, FILE *);
static void cris_print_index (rtx, FILE *);
@@ -227,6 +229,9 @@ int cris_cpu_version = CRIS_DEFAULT_CPU_
#undef TARGET_PROMOTE_FUNCTION_MODE
#define TARGET_PROMOTE_FUNCTION_MODE cris_promote_function_mode
+#undef TARGET_ATOMIC_ALIGN_FOR_MODE
+#define TARGET_ATOMIC_ALIGN_FOR_MODE cris_atomic_align_for_mode
+
#undef TARGET_STRUCT_VALUE_RTX
#define TARGET_STRUCT_VALUE_RTX cris_struct_value_rtx
#undef TARGET_SETUP_INCOMING_VARARGS
@@ -4018,6 +4023,14 @@ cris_promote_function_mode (const_tree t
return mode;
return CRIS_PROMOTED_MODE (mode, *punsignedp, type);
}
+
+/* Atomic types require alignment to be at least the "natural" size. */
+
+static unsigned int
+cris_atomic_align_for_mode (enum machine_mode mode)
+{
+ return GET_MODE_BITSIZE (mode);
+}
/* Let's assume all functions return in r[CRIS_FIRST_ARG_REG] for the
time being. */
[-- Attachment #3: Type: TEXT/PLAIN, Size: 1731 bytes --]
struct r0 {
char a;
int b;
};
struct l0 {
char a;
int b __attribute__((__aligned__(4)));
};
struct a0 {
char a;
_Atomic int b;
};
#define test(name, cond) typedef int test_ ## name [-!(cond)]
struct a0 ag;
struct l0 lg;
struct r0 rg;
struct a0 ai = {0, 1};
struct l0 li = {1, 2};
struct r0 ri = {2, 3};
extern struct a0 ae;
extern struct l0 le;
extern struct r0 re;
void foo(void)
{
struct a0 al;
struct l0 ll;
struct r0 rl;
test(a_al_ge_4, __alignof__(al) >= 4);
test(a_al_ge_ll, __alignof__(al) >= __alignof__(ll));
test(a_al_ge_rl, __alignof__(al) >= __alignof__(rl));
test(a_ag_ge_4, __alignof__(ag) >= 4);
test(a_ag_ge_lg, __alignof__(ag) >= __alignof__(lg));
test(a_ag_ge_rg, __alignof__(ag) >= __alignof__(rg));
test(a_ai_ge_4, __alignof__(ai) >= 4);
test(a_ai_ge_li, __alignof__(ai) >= __alignof__(li));
test(a_ai_ge_ri, __alignof__(ai) >= __alignof__(ri));
test(a_ae_ge_4, __alignof__(ae) >= 4);
test(a_ae_ge_le, __alignof__(ae) >= __alignof__(le));
test(a_ae_ge_re, __alignof__(ae) >= __alignof__(re));
test(s_al_ge_4, sizeof(al) >= 8);
test(s_al_ge_ll, sizeof(al) >= sizeof(ll));
test(s_al_ge_rl, sizeof(al) >= sizeof(rl));
test(s_ag_ge_4, sizeof(ag) >= 8);
test(s_ag_ge_lg, sizeof(ag) >= sizeof(lg));
test(s_ag_ge_rg, sizeof(ag) >= sizeof(rg));
test(s_ai_ge_4, sizeof(ai) >= 8);
test(s_ai_ge_lg, sizeof(ai) >= sizeof(li));
test(s_ai_ge_rg, sizeof(ai) >= sizeof(ri));
test(s_ae_ge_4, sizeof(ae) >= 8);
test(s_ae_ge_le, sizeof(ae) >= sizeof(le));
test(s_ae_ge_re, sizeof(ae) >= sizeof(re));
test(ab_eq_4, __builtin_offsetof(struct a0, b) == 4);
al = ai;
al.b++;
ae = al;
}
[-- Attachment #4: Type: TEXT/PLAIN, Size: 311 bytes --]
_Atomic int foo;
int bar;
void baz(void)
{
foo++;
}
void foobar(void)
{
bar++;
}
void xyzzy(int *x)
{
(*x)++;
}
void plugh(_Atomic int *x)
{
(*x)++;
}
void xyzzy1(int *x)
{
int y = *x;
*x = y+1;
}
void plugh2(_Atomic int *x)
{
_Atomic int y = *x;
*x = y+1;
}
next prev parent reply other threads:[~2013-11-21 23:24 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-06 0:44 Joseph S. Myers
2013-11-06 22:42 ` Andrew MacLeod
2013-11-07 17:16 ` Uros Bizjak
2013-11-07 17:24 ` Jakub Jelinek
2013-11-07 18:10 ` Uros Bizjak
2013-11-07 18:44 ` Joseph S. Myers
2013-11-07 18:47 ` Uros Bizjak
2013-11-07 18:55 ` Joseph S. Myers
[not found] ` <CAFULd4ZrAEECG+pptH8cRaWznioaM9VXS4TetpEvkWj--n7H1w@mail.gmail.com>
2013-11-07 21:02 ` Joseph S. Myers
2013-11-07 21:08 ` Uros Bizjak
2013-11-07 22:25 ` Uros Bizjak
2013-11-07 22:43 ` Joseph S. Myers
2013-11-08 10:09 ` Uros Bizjak
2013-11-08 13:33 ` Joseph S. Myers
2013-11-21 13:19 ` Hans-Peter Nilsson
2013-11-21 18:03 ` Andrew MacLeod
2013-11-21 18:20 ` Hans-Peter Nilsson
2013-11-21 18:30 ` Andrew MacLeod
2013-11-21 18:49 ` Joseph S. Myers
2013-11-21 18:58 ` Andrew MacLeod
2013-11-21 19:24 ` Hans-Peter Nilsson
2013-11-22 2:57 ` Hans-Peter Nilsson [this message]
2013-11-22 3:03 ` Andrew MacLeod
2013-11-22 3:32 ` Hans-Peter Nilsson
2013-11-22 3:32 ` Joseph S. Myers
2013-11-22 19:12 ` Andrew MacLeod
2013-11-22 20:01 ` Hans-Peter Nilsson
2013-11-08 13:28 Dominique Dhumieres
2013-11-08 13:34 ` Joseph S. Myers
2013-11-08 13:43 ` Dominique Dhumieres
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