* [Bug target/38708] [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
@ 2009-01-02 18:49 ` pinskia at gcc dot gnu dot org
2009-01-02 18:51 ` pinskia at gcc dot gnu dot org
` (14 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2009-01-02 18:49 UTC (permalink / raw)
To: gcc-bugs
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |critical
Target Milestone|--- |4.4.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
2009-01-02 18:49 ` [Bug target/38708] " pinskia at gcc dot gnu dot org
@ 2009-01-02 18:51 ` pinskia at gcc dot gnu dot org
2009-01-02 19:03 ` [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentium-m hjl dot tools at gmail dot com
` (13 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2009-01-02 18:51 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from pinskia at gcc dot gnu dot org 2009-01-02 18:46 -------
Also fails on i386-darwin with -march=pentium-m. Plus it works with 4.3.3 so
this is only a 4.4 regression.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
GCC target triplet|i686-pc-linux-gnu |i?86-*-*
Known to work|4.1.2 |4.1.2 4.3.3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentium-m
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
2009-01-02 18:49 ` [Bug target/38708] " pinskia at gcc dot gnu dot org
2009-01-02 18:51 ` pinskia at gcc dot gnu dot org
@ 2009-01-02 19:03 ` hjl dot tools at gmail dot com
2009-01-02 22:03 ` hjl dot tools at gmail dot com
` (12 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: hjl dot tools at gmail dot com @ 2009-01-02 19:03 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from hjl dot tools at gmail dot com 2009-01-02 19:01 -------
Adding -mtune=pentium-m will fail gcc.c-torture/execute/memset-2.c
with -O3 and gcc.c-torture/execute/memset-3.c with -O/-O2/-O3.
--
hjl dot tools at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hjl dot tools at gmail dot
| |com, raksit at google dot
| |com
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2009-01-02 19:01:18
date| |
Summary|[4.4 Regression] gcc.c- |[4.4 Regression] Revision
|torture/execute/memset-3.c |137646 caused gcc.c-
|Fails with -march=pentium-m |torture/execute/memset-
|-O1 |[23].c fail with -
| |mtune=pentium-m
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentium-m
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
` (2 preceding siblings ...)
2009-01-02 19:03 ` [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentium-m hjl dot tools at gmail dot com
@ 2009-01-02 22:03 ` hjl dot tools at gmail dot com
2009-01-02 22:10 ` [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro pinskia at gcc dot gnu dot org
` (11 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: hjl dot tools at gmail dot com @ 2009-01-02 22:03 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from hjl dot tools at gmail dot com 2009-01-02 22:01 -------
i386.c has
/* Output code to set at most count & (max_size - 1) bytes starting by DEST.
*/static void
expand_setmem_epilogue_via_loop (rtx destmem, rtx destptr, rtx value,
rtx count, int max_size)
{
count =
expand_simple_binop (counter_mode (count), AND, count,
GEN_INT (max_size - 1), count, 1, OPTAB_DIRECT);
expand_set_or_movmem_via_loop (destmem, NULL, destptr, NULL,
gen_lowpart (QImode, value), count, QImode,
1, max_size / 2);
}
It seems to assume that max_size is power of 2. But there may not be
the case:
#0 expand_set_or_movmem_via_loop (destmem=0x7ffff30f17e0, srcmem=0x0,
destptr=0x7ffff30f1560, srcptr=0x0, value=0x7ffff30f1500,
count=0x7ffff30f1520, mode=QImode, unroll=1, expected_size=3)
at /export/gnu/src/gcc-work/gcc/gcc/config/i386/i386.c:16484
#1 0x0000000000b6e7d1 in expand_setmem_epilogue_via_loop (
destmem=0x7ffff30f17e0, destptr=0x7ffff30f1560, value=0x7ffff30f1500,
count=0x7ffff30f1520, max_size=7)
at /export/gnu/src/gcc-work/gcc/gcc/config/i386/i386.c:16850
#2 0x0000000000b71af6 in ix86_expand_setmem (dst=0x7ffff30f17e0,
count_exp=0x7ffff30f1520, val_exp=0x7ffff30f1500,
align_exp=0x7ffff31f4470, expected_align_exp=0x7ffff31f4470,
expected_size_exp=0x7ffff31f4440)
at /export/gnu/src/gcc-work/gcc/gcc/config/i386/i386.c:18031
#3 0x0000000000ce16cc in gen_setmemsi (operand0=0x7ffff30f1440,
operand1=0x7ffff30f1340, operand2=0x7ffff30f1500, operand3=0x7ffff31f4470,
operand4=0x7ffff31f4470, operand5=0x7ffff31f4440)
at /export/gnu/src/gcc-work/gcc/gcc/config/i386/i386.md:19126
#4 0x000000000061478b in set_storage_via_setmem (object=0x7ffff30f1440,
size=0x7ffff30f1340, val=0x7ffff30f1500, align=16, expected_align=16,
expected_size=-1) at /export/gnu/src/gcc-work/gcc/gcc/expr.c:2807
The problem comes from
if (label)
{
/* When the main loop is done, COUNT_EXP might hold original count,
while we want to copy only COUNT_EXP & SIZE_NEEDED bytes.
Epilogue code will actually copy COUNT_EXP & EPILOGUE_SIZE_NEEDED
bytes. Compensate if needed. */
if (size_needed < desired_align - align)
{
tmp =
expand_simple_binop (counter_mode (count_exp), AND, count_exp,
GEN_INT (size_needed - 1), count_exp, 1,
OPTAB_DIRECT);
size_needed = desired_align - align + 1;
if (tmp != count_exp)
emit_move_insn (count_exp, tmp);
}
emit_label (label);
LABEL_NUSES (label) = 1;
}
size_needed won't be power of 2. If we add
--- ./i386.c.align 2008-12-23 09:34:11.000000000 -0800
+++ ./i386.c 2009-01-02 14:00:33.000000000 -0800
@@ -16751,6 +16751,7 @@ expand_movmem_epilogue (rtx destmem, rtx
}
if (max_size > 8)
{
+ gcc_assert (max_size == (max_size & -max_size));
count = expand_simple_binop (GET_MODE (count), AND, count, GEN_INT
(max_size - 1),
count, 1, OPTAB_DIRECT);
expand_set_or_movmem_via_loop (destmem, srcmem, destptr, srcptr, NULL,
@@ -16844,6 +16845,7 @@ static void
expand_setmem_epilogue_via_loop (rtx destmem, rtx destptr, rtx value,
rtx count, int max_size)
{
+ gcc_assert (max_size == (max_size & -max_size));
count =
expand_simple_binop (counter_mode (count), AND, count,
GEN_INT (max_size - 1), count, 1, OPTAB_DIRECT);
we will get an error.
--
hjl dot tools at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jh at suse dot cz
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
` (3 preceding siblings ...)
2009-01-02 22:03 ` hjl dot tools at gmail dot com
@ 2009-01-02 22:10 ` pinskia at gcc dot gnu dot org
2009-01-03 8:47 ` jakub at gcc dot gnu dot org
` (10 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2009-01-02 22:10 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from pinskia at gcc dot gnu dot org 2009-01-02 22:08 -------
-march=pentiumpro is enough to reproduce the failure.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[4.4 Regression] Revision |[4.4 Regression] Revision
|137646 caused gcc.c- |137646 caused gcc.c-
|torture/execute/memset- |torture/execute/memset-
|[23].c fail with - |[23].c fail with -
|mtune=pentium-m |mtune=pentiumpro
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
` (4 preceding siblings ...)
2009-01-02 22:10 ` [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro pinskia at gcc dot gnu dot org
@ 2009-01-03 8:47 ` jakub at gcc dot gnu dot org
2009-01-03 9:10 ` jakub at gcc dot gnu dot org
` (9 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-01-03 8:47 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from jakub at gcc dot gnu dot org 2009-01-03 08:46 -------
There are several issues. One is what H.J. mentioned, seen e.g. on:
char buf[8] __attribute__((aligned));
char A = 'A';
int len = 1;
void __attribute__((noinline))
check (void)
{
if (__builtin_memcmp (buf, "\0\0A\0\0\0\0\0", 8))
__builtin_abort ();
}
int
main ()
{
__builtin_memset (buf + 2, A, len);
check ();
return 0;
}
with -O -mtune=pentium-m -m32. This can be fixed by adding
max_size = smallest_pow2_greater_than (max_size - 1); at the start of
expand_setmem_epilogue_via_loop. But another testcase with the same options
that still fails is:
char buf[8] __attribute__((aligned)) = "AAAAAAAA";
char A = 'A';
int len = 4;
void __attribute__((noinline))
check (void)
{
if (__builtin_memcmp (buf, "AAAA\0\0\0\0", 8))
__builtin_abort ();
}
int
main ()
{
__builtin_memset (buf + 4, '\0', len);
check ();
return 0;
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
` (5 preceding siblings ...)
2009-01-03 8:47 ` jakub at gcc dot gnu dot org
@ 2009-01-03 9:10 ` jakub at gcc dot gnu dot org
2009-01-03 10:27 ` jakub at gcc dot gnu dot org
` (8 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-01-03 9:10 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from jakub at gcc dot gnu dot org 2009-01-03 09:09 -------
--- i386.c.jj4 2008-12-27 10:12:25.000000000 +0100
+++ i386.c 2009-01-03 10:03:05.000000000 +0100
@@ -18012,13 +18012,12 @@ ix86_expand_setmem (rtx dst, rtx count_e
Epilogue code will actually copy COUNT_EXP & EPILOGUE_SIZE_NEEDED
bytes. Compensate if needed. */
- if (size_needed < desired_align - align)
+ if (size_needed < epilogue_size_needed)
{
tmp =
expand_simple_binop (counter_mode (count_exp), AND, count_exp,
GEN_INT (size_needed - 1), count_exp, 1,
OPTAB_DIRECT);
- size_needed = desired_align - align + 1;
if (tmp != count_exp)
emit_move_insn (count_exp, tmp);
}
@@ -18029,10 +18028,10 @@ ix86_expand_setmem (rtx dst, rtx count_e
{
if (force_loopy_epilogue)
expand_setmem_epilogue_via_loop (dst, destreg, val_exp, count_exp,
- size_needed);
+ epilogue_size_needed);
else
expand_setmem_epilogue (dst, destreg, promoted_val, count_exp,
- size_needed);
+ epilogue_size_needed);
}
if (jump_around_label)
emit_label (jump_around_label);
instead seems to fix memset-3.c with -mtune=pentium-m -m32 at all optimizations
levels (and is what ix86_expand_movmem does). But memset-2.c still fails, and
not just at -O3, but also at -O2.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
` (6 preceding siblings ...)
2009-01-03 9:10 ` jakub at gcc dot gnu dot org
@ 2009-01-03 10:27 ` jakub at gcc dot gnu dot org
2009-01-03 10:28 ` jakub at gcc dot gnu dot org
` (7 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-01-03 10:27 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from jakub at gcc dot gnu dot org 2009-01-03 10:26 -------
Created an attachment (id=17025)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17025&action=view)
gcc44-pr38708.patch
For size_needed, we never want any epilogue. This cures memset-2.c at -O2, but
-O3 still fails.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
` (7 preceding siblings ...)
2009-01-03 10:27 ` jakub at gcc dot gnu dot org
@ 2009-01-03 10:28 ` jakub at gcc dot gnu dot org
2009-01-03 11:40 ` jakub at gcc dot gnu dot org
` (6 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-01-03 10:28 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from jakub at gcc dot gnu dot org 2009-01-03 10:26 -------
I meant for size_needed == 1.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
` (8 preceding siblings ...)
2009-01-03 10:28 ` jakub at gcc dot gnu dot org
@ 2009-01-03 11:40 ` jakub at gcc dot gnu dot org
2009-01-04 14:26 ` jakub at gcc dot gnu dot org
` (5 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-01-03 11:40 UTC (permalink / raw)
To: gcc-bugs
------- Comment #9 from jakub at gcc dot gnu dot org 2009-01-03 11:39 -------
I ran check-gcc RUNTESTFLAGS='execute.exp
--target_board=unix/{-m32,-m32/-mtune=pentium-m,-m64}/-mstringop-strategy={rep_byte,libcall,rep_4byte,rep_8byte,byte_loop,loop,unrolled_loop}'
before and after the patch. In all cases, -m32 together with
-mstringop-strategy=rep_8byte
ICEs in many testcases, obviously we need to reject -m32
-mstringop-strategy=rep_8byte.
Other than that, we have:
unix/-m64/-mstringop-strategy=loop
FAIL: gcc.c-torture/execute/memset-2.c execution, -O2
FAIL: gcc.c-torture/execute/memset-2.c execution, -O3 -fomit-frame-pointer
FAIL: gcc.c-torture/execute/memset-2.c execution, -O3 -fomit-frame-pointer
-funroll-loops
FAIL: gcc.c-torture/execute/memset-2.c execution, -O3 -fomit-frame-pointer
-funroll-all-loops -finline-functions
FAIL: gcc.c-torture/execute/memset-2.c execution, -O3 -g
(before and after the patch) and:
unix/-m32/-mtune=pentium-m/-mstringop-strategy=rep_byte
-FAIL: gcc.c-torture/execute/memcpy-2.c execution, -O1
-FAIL: gcc.c-torture/execute/memcpy-2.c execution, -O2
-FAIL: gcc.c-torture/execute/memcpy-2.c execution, -O3 -fomit-frame-pointer
-FAIL: gcc.c-torture/execute/memcpy-2.c execution, -O3 -fomit-frame-pointer
-funroll-loops
-FAIL: gcc.c-torture/execute/memcpy-2.c execution, -O3 -fomit-frame-pointer
-funroll-all-loops -finline-functions
-FAIL: gcc.c-torture/execute/memcpy-2.c execution, -O3 -g
FAIL: gcc.c-torture/execute/memset-1.c execution, -O1
FAIL: gcc.c-torture/execute/memset-1.c execution, -O2
FAIL: gcc.c-torture/execute/memset-1.c execution, -O3 -fomit-frame-pointer
FAIL: gcc.c-torture/execute/memset-1.c execution, -O3 -fomit-frame-pointer
-funroll-loops
FAIL: gcc.c-torture/execute/memset-1.c execution, -O3 -fomit-frame-pointer
-funroll-all-loops -finline-functions
FAIL: gcc.c-torture/execute/memset-1.c execution, -O3 -g
FAIL: gcc.c-torture/execute/memset-2.c execution, -O3 -fomit-frame-pointer
FAIL: gcc.c-torture/execute/memset-2.c execution, -O3 -fomit-frame-pointer
-funroll-loops
FAIL: gcc.c-torture/execute/memset-2.c execution, -O3 -fomit-frame-pointer
-funroll-all-loops -finline-functions
FAIL: gcc.c-torture/execute/memset-2.c execution, -O3 -g
FAIL: gcc.c-torture/execute/memset-3.c execution, -O1
FAIL: gcc.c-torture/execute/memset-3.c execution, -O2
FAIL: gcc.c-torture/execute/memset-3.c execution, -O3 -fomit-frame-pointer
FAIL: gcc.c-torture/execute/memset-3.c execution, -O3 -fomit-frame-pointer
-funroll-loops
FAIL: gcc.c-torture/execute/memset-3.c execution, -O3 -fomit-frame-pointer
-funroll-all-loops -finline-functions
FAIL: gcc.c-torture/execute/memset-3.c execution, -O3 -g
unix/-m32/-mtune=pentium-m/-mstringop-strategy=rep_4byte
-FAIL: gcc.c-torture/execute/memset-3.c execution, -O1
-FAIL: gcc.c-torture/execute/memset-3.c execution, -O2
-FAIL: gcc.c-torture/execute/memset-3.c execution, -O3 -fomit-frame-pointer
-FAIL: gcc.c-torture/execute/memset-3.c execution, -O3 -fomit-frame-pointer
-funroll-loops
-FAIL: gcc.c-torture/execute/memset-3.c execution, -O3 -fomit-frame-pointer
-funroll-all-loops -finline-functions
-FAIL: gcc.c-torture/execute/memset-3.c execution, -O3 -g
( FAIL is before+after the patch, -FAIL is before the patch, cured by the
patch).
To reject rep_8byte for -m32 we IMHO want:
--- i386.c.jj42008-12-27 10:12:25.000000000 +0100
+++ i386.c2009-01-03 11:53:15.000000000 +0100
@@ -2686,7 +2686,8 @@ override_options (bool main_args_p)
stringop_alg = libcall;
else if (!strcmp (ix86_stringop_string, "rep_4byte"))
stringop_alg = rep_prefix_4_byte;
- else if (!strcmp (ix86_stringop_string, "rep_8byte"))
+ else if (!strcmp (ix86_stringop_string, "rep_8byte")
+ && TARGET_64BIT)
stringop_alg = rep_prefix_8_byte;
else if (!strcmp (ix86_stringop_string, "byte_loop"))
stringop_alg = loop_1_byte;
and obviously the remaining FAILs need to be investigated.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
` (9 preceding siblings ...)
2009-01-03 11:40 ` jakub at gcc dot gnu dot org
@ 2009-01-04 14:26 ` jakub at gcc dot gnu dot org
2009-01-05 11:32 ` rguenth at gcc dot gnu dot org
` (4 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-01-04 14:26 UTC (permalink / raw)
To: gcc-bugs
------- Comment #10 from jakub at gcc dot gnu dot org 2009-01-04 14:26 -------
The problem is that if size is smaller than epilogue_size_needed, desired_align
> align and size_needed == 1, then ix86_expand_setmem jumps around the
initialization of promoted_val (when val_exp isn't CONST_INT) and alignment,
but then uses promoted_val for rep stosb (which is thus uninitialized).
I have a fix.
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |jakub at gcc dot gnu dot org
|dot org |
Status|NEW |ASSIGNED
Last reconfirmed|2009-01-02 19:01:18 |2009-01-04 14:26:28
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
` (10 preceding siblings ...)
2009-01-04 14:26 ` jakub at gcc dot gnu dot org
@ 2009-01-05 11:32 ` rguenth at gcc dot gnu dot org
2009-01-05 11:44 ` rguenth at gcc dot gnu dot org
` (3 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2009-01-05 11:32 UTC (permalink / raw)
To: gcc-bugs
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
` (11 preceding siblings ...)
2009-01-05 11:32 ` rguenth at gcc dot gnu dot org
@ 2009-01-05 11:44 ` rguenth at gcc dot gnu dot org
2009-01-06 11:13 ` jakub at gcc dot gnu dot org
` (2 subsequent siblings)
15 siblings, 0 replies; 17+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2009-01-05 11:44 UTC (permalink / raw)
To: gcc-bugs
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P2 |P1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
` (12 preceding siblings ...)
2009-01-05 11:44 ` rguenth at gcc dot gnu dot org
@ 2009-01-06 11:13 ` jakub at gcc dot gnu dot org
2009-01-09 17:13 ` jakub at gcc dot gnu dot org
2009-01-09 17:14 ` jakub at gcc dot gnu dot org
15 siblings, 0 replies; 17+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-01-06 11:13 UTC (permalink / raw)
To: gcc-bugs
------- Comment #11 from jakub at gcc dot gnu dot org 2009-01-06 11:13 -------
*** Bug 38686 has been marked as a duplicate of this bug. ***
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
` (13 preceding siblings ...)
2009-01-06 11:13 ` jakub at gcc dot gnu dot org
@ 2009-01-09 17:13 ` jakub at gcc dot gnu dot org
2009-01-09 17:14 ` jakub at gcc dot gnu dot org
15 siblings, 0 replies; 17+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-01-09 17:13 UTC (permalink / raw)
To: gcc-bugs
------- Comment #12 from jakub at gcc dot gnu dot org 2009-01-09 17:13 -------
Subject: Bug 38708
Author: jakub
Date: Fri Jan 9 17:12:40 2009
New Revision: 143211
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=143211
Log:
PR target/38686
PR target/38708
* config/i386/i386.c (override_options): Reject
-mstringop-strategy=rep_8byte with -m32.
(ix86_expand_movmem): For size_needed == 1 set epilogue_size_needed
to 1. Do count comparison against epilogue_size_needed at compile
time even when count_exp was constant forced into register. For
size_needed don't jump to epilogue, instead just avoid aligning
and invoke the body algorithm. If need_zero_guard, add zero guard
even if count is non-zero, but smaller than size_needed + number of
bytes that could be stored for alignment.
(ix86_expand_setmem): For size_needed == 1 set epilogue_size_needed
to 1. If need_zero_guard, add zero guard even if count is non-zero,
but smaller than size_needed + number of bytes that could be stored
for alignment. Compare size_needed with epilogue_size_needed instead
of desired_align - align, don't adjust size_needed, pass
epilogue_size_needed to the epilogue expanders.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread* [Bug target/38708] [4.4 Regression] Revision 137646 caused gcc.c-torture/execute/memset-[23].c fail with -mtune=pentiumpro
2009-01-02 18:45 [Bug target/38708] New: [4.4 Regression] gcc.c-torture/execute/memset-3.c Fails with -march=pentium-m -O1 pinskia at gcc dot gnu dot org
` (14 preceding siblings ...)
2009-01-09 17:13 ` jakub at gcc dot gnu dot org
@ 2009-01-09 17:14 ` jakub at gcc dot gnu dot org
15 siblings, 0 replies; 17+ messages in thread
From: jakub at gcc dot gnu dot org @ 2009-01-09 17:14 UTC (permalink / raw)
To: gcc-bugs
------- Comment #13 from jakub at gcc dot gnu dot org 2009-01-09 17:13 -------
Fixed.
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38708
^ permalink raw reply [flat|nested] 17+ messages in thread