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* [Bug c++/44900] New: The variable of SSE will be broken
@ 2010-07-10 8:28 yottui at yahoo dot co dot jp
2010-07-10 15:13 ` [Bug c++/44900] " yottui at yahoo dot co dot jp
` (27 more replies)
0 siblings, 28 replies; 29+ messages in thread
From: yottui at yahoo dot co dot jp @ 2010-07-10 8:28 UTC (permalink / raw)
To: gcc-bugs
I'm using gcc-4.5.0-1 of MinGW with Intel x86.
When I execute the following test code with '-O -msse' compiler options, it
outputs the wrong value.
I'm expecting that v2.e[3] will be 7.0f.
And, when I exclude LINE_A, LINE_B, LINE_C or LINE_D as a comment, the program
outputs the expected value.
-- begin test code --
// g++ -O -msse test.cpp
typedef float __m128 __attribute__ ((__vector_size__ (16), __may_alias__));
typedef float __v4sf __attribute__ ((__vector_size__ (16)));
extern __inline __m128 __attribute__((__gnu_inline__, __always_inline__,
__artificial__))
_mm_set_ps (const float __Z, const float __Y, const float __X, const float __W)
{
return __extension__ (__m128)(__v4sf){ __W, __X, __Y, __Z };
}
struct vec
{
union {
__m128 v;
float e[4];
};
static const vec & zero()
{
static const vec v = _mm_set_ps(0, 0, 0, 0);
return v;
}
vec() {}
vec(const __m128 & a) : v(a) {}
operator const __m128&() const { return v; }
};
struct vec2
{
vec _v1;
vec _v2;
vec2() {}
vec2(const vec & a, const vec & b) : _v1(a), _v2(b) {}
static vec2 load(const float * a)
{
return vec2(
__builtin_ia32_loadups(&a[0]),
__builtin_ia32_loadups(&a[4]));
}
const vec & v1() const { return _v1; }
const vec & v2() const { return _v2; }
};
extern "C" {
int* _errno(void);
int printf (const char*, ...);
}
inline bool test_assert( bool is_succeed, const char * file_name, int line_num
)
{
if ( !is_succeed )
{
printf("error: %s(%d)\n", file_name, line_num);
if ( *_errno() ) // LINE_A
{
printf("errno: %d\n", *_errno());
}
}
return is_succeed;
}
inline bool operator==(const vec & a, const vec & b)
{ return 0xf == __builtin_ia32_movmskps(__builtin_ia32_cmpeqps(a, b)); }
#define test(x, y) test_assert( (x)==(y), __FILE__, __LINE__ )
int main( int argc, char * argv[] )
{
__attribute__((aligned(16))) float data[] =
{ 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5 };
float * p = &data[2];
vec2 a;
a = vec2::load(p);
vec v1 = a.v1();
vec v2 = a.v2();
printf(
"v1: %f, %f, %f, %f\n"
"v2: %f, %f, %f, %f\n",
v1.e[0], v1.e[1], v1.e[2], v1.e[3],
v2.e[0], v2.e[1], v2.e[2], v2.e[3]);
test(_mm_set_ps(11, 12, 13, 14), a.v1()); // LINE_B
test(_mm_set_ps( 7, 8, 9, 10), a.v2()); // LINE_C
a._v1 = vec::zero();
test(_mm_set_ps(0, 0, 0, 0), a.v1()); // LINE_D
return 0;
}
-- end test code --
-- begin output --
v1: 14.000000, 13.000000, 12.000000, 11.000000
v2: 10.000000, 9.000000, 8.000000, 0.000000
error: test.cpp(92)
-- end output --
--
Summary: The variable of SSE will be broken
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: yottui at yahoo dot co dot jp
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug c++/44900] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
@ 2010-07-10 15:13 ` yottui at yahoo dot co dot jp
2010-07-11 11:25 ` [Bug target/44900] " ubizjak at gmail dot com
` (26 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: yottui at yahoo dot co dot jp @ 2010-07-10 15:13 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from yottui at yahoo dot co dot jp 2010-07-10 15:12 -------
Also, I reproduced it on gcc45 of MacPorts 1.9.1 with '-O -m32 -msse' compiler
options.
At that time, I modified errno of the test code.
--- test.old.cpp 2010-07-10 23:27:22.000000000 +0900
+++ test.new.cpp 2010-07-10 23:32:57.000000000 +0900
@@ -48,7 +48,7 @@
};
extern "C" {
- int* _errno(void);
+ extern int errno;
int printf (const char*, ...);
}
@@ -58,9 +58,9 @@
if ( !is_succeed )
{
printf("error: %s(%d)\n", file_name, line_num);
- if ( *_errno() ) // LINE_A
+ if ( errno ) // LINE_A
{
- printf("errno: %d\n", *_errno());
+ printf("errno: %d\n", errno);
}
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug target/44900] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
2010-07-10 15:13 ` [Bug c++/44900] " yottui at yahoo dot co dot jp
@ 2010-07-11 11:25 ` ubizjak at gmail dot com
2010-07-11 11:39 ` ubizjak at gmail dot com
` (25 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: ubizjak at gmail dot com @ 2010-07-11 11:25 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from ubizjak at gmail dot com 2010-07-11 11:25 -------
Confirmed on i686-pc-linux-gnu (with errno fully removed).
4.6.0 works OK.
--
ubizjak at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Component|c++ |target
Ever Confirmed|0 |1
Known to fail| |4.5.1
Known to work| |4.6.0
Last reconfirmed|0000-00-00 00:00:00 |2010-07-11 11:25:40
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug target/44900] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
2010-07-10 15:13 ` [Bug c++/44900] " yottui at yahoo dot co dot jp
2010-07-11 11:25 ` [Bug target/44900] " ubizjak at gmail dot com
@ 2010-07-11 11:39 ` ubizjak at gmail dot com
2010-07-11 11:42 ` [Bug target/44900] [4.5 Regression] " ubizjak at gmail dot com
` (24 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: ubizjak at gmail dot com @ 2010-07-11 11:39 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from ubizjak at gmail dot com 2010-07-11 11:39 -------
For some reason, we got:
movl $0x41800000, 112(%esp)
movl $0x41700000, 116(%esp)
movl $0x41600000, 120(%esp)
movl $0x41500000, 124(%esp)
movl $0x41400000, 128(%esp)
movl $0x41300000, 132(%esp)
movl $0x41200000, 136(%esp)
movl $0x41100000, 140(%esp)
movl $0x41000000, 144(%esp)
movl $0x40e00000, 148(%esp)
movl $0x40c00000, 152(%esp)
movl $0x40a00000, 156(%esp)
movups 136(%esp), %xmm0
movaps %xmm0, 96(%esp)
movups 120(%esp), %xmm0
movaps %xmm0, 80(%esp)
movaps %xmm0, 160(%esp)
movaps 96(%esp), %xmm0
movaps %xmm0, 176(%esp)
>>> fldz
fstpl 60(%esp)
flds 184(%esp)
fstpl 52(%esp)
flds 180(%esp)
fstpl 44(%esp)
flds 176(%esp)
fstpl 36(%esp)
flds 172(%esp)
fstpl 28(%esp)
flds 168(%esp)
fstpl 20(%esp)
flds 164(%esp)
fstpl 12(%esp)
flds 160(%esp)
fstpl 4(%esp)
movl $.LC12, (%esp)
call printf
Changing fldz to "flds 188(%esp)" produces correct output.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug target/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (2 preceding siblings ...)
2010-07-11 11:39 ` ubizjak at gmail dot com
@ 2010-07-11 11:42 ` ubizjak at gmail dot com
2010-07-11 11:59 ` ubizjak at gmail dot com
` (23 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: ubizjak at gmail dot com @ 2010-07-11 11:42 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from ubizjak at gmail dot com 2010-07-11 11:42 -------
4.4 works OK, so this is 4.5 regression.
--
ubizjak at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work|4.6.0 |4.6.0 4.4.4
Summary|The variable of SSE will be |[4.5 Regression] The
|broken |variable of SSE will be
| |broken
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug target/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (3 preceding siblings ...)
2010-07-11 11:42 ` [Bug target/44900] [4.5 Regression] " ubizjak at gmail dot com
@ 2010-07-11 11:59 ` ubizjak at gmail dot com
2010-07-11 12:49 ` [Bug tree-optimization/44900] " rguenth at gcc dot gnu dot org
` (22 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: ubizjak at gmail dot com @ 2010-07-11 11:59 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from ubizjak at gmail dot com 2010-07-11 11:59 -------
Expand expands with uninitialized register r68:
41 [r54:SI-0x20]=r73:V4SF
42 [r54:SI-0x10]=r72:V4SF
> 43 [r56:SI+0x3c]=float_extend(r68:SF)
44 [r56:SI+0x34]=float_extend([r54:SI-0x8])
45 [r56:SI+0x2c]=float_extend([r54:SI-0xc])
46 [r56:SI+0x24]=float_extend([r54:SI-0x10])
47 [r56:SI+0x1c]=float_extend([r54:SI-0x14])
48 [r56:SI+0x14]=float_extend([r54:SI-0x18])
49 [r56:SI+0xc]=float_extend([r54:SI-0x1c])
50 [r56:SI+0x4]=float_extend([r54:SI-0x20])
51 [r56:SI]=`*.LC12'
52 call <...>
.optimized tree dump looks suspicious, load from uninitialized var:
SR.14_103 = __builtin_ia32_loadups (&data[6]);
SR.13_104 = __builtin_ia32_loadups (&data[2]);
a._v1.D.1895.v = SR.13_104;
a._v2.D.1895.v = SR.14_103;
a$_v2$D1895$e$0_98 = a._v2.D.1895.e[0];
a$_v2$D1895$e$1_110 = a._v2.D.1895.e[1];
a$_v2$D1895$e$2_105 = a._v2.D.1895.e[2];
v1$D1895$e$0_99 = a._v1.D.1895.e[0];
v1$D1895$e$1_40 = a._v1.D.1895.e[1];
v1$D1895$e$2_95 = a._v1.D.1895.e[2];
v1$D1895$e$3_79 = a._v1.D.1895.e[3];
D.2043_5 = (double) a$_v2$D1895$e$3_82(D); <--- here
D.2045_7 = (double) a$_v2$D1895$e$2_105;
D.2047_9 = (double) a$_v2$D1895$e$1_110;
D.2049_11 = (double) a$_v2$D1895$e$0_98;
D.2051_13 = (double) v1$D1895$e$3_79;
D.2053_15 = (double) v1$D1895$e$2_95;
D.2055_17 = (double) v1$D1895$e$1_40;
D.2057_19 = (double) v1$D1895$e$0_99;
Needs tree expert. CC'd.
--
ubizjak at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (4 preceding siblings ...)
2010-07-11 11:59 ` ubizjak at gmail dot com
@ 2010-07-11 12:49 ` rguenth at gcc dot gnu dot org
2010-07-11 21:00 ` hjl dot tools at gmail dot com
` (21 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2010-07-11 12:49 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from rguenth at gcc dot gnu dot org 2010-07-11 12:48 -------
Confirmed, caused by SRA, maybe latent on the trunk.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jamborm at gcc dot gnu dot
| |org
Component|target |tree-optimization
Keywords| |wrong-code
Known to fail|4.5.1 |4.5.0 4.5.1
Target Milestone|--- |4.5.1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (5 preceding siblings ...)
2010-07-11 12:49 ` [Bug tree-optimization/44900] " rguenth at gcc dot gnu dot org
@ 2010-07-11 21:00 ` hjl dot tools at gmail dot com
2010-07-11 22:00 ` rguenth at gcc dot gnu dot org
` (20 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: hjl dot tools at gmail dot com @ 2010-07-11 21:00 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from hjl dot tools at gmail dot com 2010-07-11 20:59 -------
It works with gcc 4.5.0. It is a 4.5.1 regression.
--
hjl dot tools at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail|4.5.0 4.5.1 |4.5.1
Known to work|4.6.0 4.4.4 |4.6.0 4.4.4 4.5.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (6 preceding siblings ...)
2010-07-11 21:00 ` hjl dot tools at gmail dot com
@ 2010-07-11 22:00 ` rguenth at gcc dot gnu dot org
2010-07-11 22:47 ` pinskia at gcc dot gnu dot org
` (19 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2010-07-11 22:00 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from rguenth at gcc dot gnu dot org 2010-07-11 21:59 -------
Hm? I checked 4.5.0 and it was broken as well, so someone should double-check
(I can't at the moment).
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (7 preceding siblings ...)
2010-07-11 22:00 ` rguenth at gcc dot gnu dot org
@ 2010-07-11 22:47 ` pinskia at gcc dot gnu dot org
2010-07-11 23:11 ` yottui at yahoo dot co dot jp
` (18 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2010-07-11 22:47 UTC (permalink / raw)
To: gcc-bugs
------- Comment #9 from pinskia at gcc dot gnu dot org 2010-07-11 22:47 -------
Works with:
GNU C++ (GCC) version 4.5.0 20100401 (experimental) [trunk revision 157933]
(x86_64-unknown-linux-gnu)
compiled by GNU C version 4.5.0 20100401 (experimental) [trunk revision
157933], GMP version 4.3.2, MPFR version 2.4.2, MPC version 0.8.1
Which is before the branch of 4.5.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail|4.5.1 |
Known to work|4.6.0 4.4.4 4.5.0 |4.6.0 4.4.4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (8 preceding siblings ...)
2010-07-11 22:47 ` pinskia at gcc dot gnu dot org
@ 2010-07-11 23:11 ` yottui at yahoo dot co dot jp
2010-07-11 23:35 ` hjl dot tools at gmail dot com
` (17 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: yottui at yahoo dot co dot jp @ 2010-07-11 23:11 UTC (permalink / raw)
To: gcc-bugs
------- Comment #10 from yottui at yahoo dot co dot jp 2010-07-11 23:11 -------
Please use '-m32' if host is x64.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (9 preceding siblings ...)
2010-07-11 23:11 ` yottui at yahoo dot co dot jp
@ 2010-07-11 23:35 ` hjl dot tools at gmail dot com
2010-07-12 1:06 ` hjl dot tools at gmail dot com
` (16 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: hjl dot tools at gmail dot com @ 2010-07-11 23:35 UTC (permalink / raw)
To: gcc-bugs
------- Comment #11 from hjl dot tools at gmail dot com 2010-07-11 23:35 -------
It is very likely caused by revision 158826:
http://gcc.gnu.org/ml/gcc-cvs/2010-04/msg00933.html
I will verify it and find out which checkin on trunk
fixes/hides this bug.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (10 preceding siblings ...)
2010-07-11 23:35 ` hjl dot tools at gmail dot com
@ 2010-07-12 1:06 ` hjl dot tools at gmail dot com
2010-07-12 2:04 ` hjl dot tools at gmail dot com
` (15 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: hjl dot tools at gmail dot com @ 2010-07-12 1:06 UTC (permalink / raw)
To: gcc-bugs
------- Comment #12 from hjl dot tools at gmail dot com 2010-07-12 01:05 -------
It is caused by revision 158826. On trunk, it
is fixed/hidden by revision 158732:
http://gcc.gnu.org/ml/gcc-cvs/2010-04/msg00839.html
--
hjl dot tools at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hubicka at gcc dot gnu dot
| |org
Known to fail| |4.5.1
Known to work|4.6.0 4.4.4 |4.6.0 4.4.4 4.5.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (11 preceding siblings ...)
2010-07-12 1:06 ` hjl dot tools at gmail dot com
@ 2010-07-12 2:04 ` hjl dot tools at gmail dot com
2010-07-12 7:55 ` rguenth at gcc dot gnu dot org
` (14 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: hjl dot tools at gmail dot com @ 2010-07-12 2:04 UTC (permalink / raw)
To: gcc-bugs
------- Comment #13 from hjl dot tools at gmail dot com 2010-07-12 02:03 -------
If you replace
---
vec2 a;
a = vec2::load(p);
---
with
---
vec2 a = vec2::load(p);
---
the testcase will pass.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (12 preceding siblings ...)
2010-07-12 2:04 ` hjl dot tools at gmail dot com
@ 2010-07-12 7:55 ` rguenth at gcc dot gnu dot org
2010-07-14 9:22 ` yottui at yahoo dot co dot jp
` (13 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2010-07-12 7:55 UTC (permalink / raw)
To: gcc-bugs
------- Comment #14 from rguenth at gcc dot gnu dot org 2010-07-12 07:54 -------
It indeed works with the 4.5.0 release which makes it a blocker for 4.5.1.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (13 preceding siblings ...)
2010-07-12 7:55 ` rguenth at gcc dot gnu dot org
@ 2010-07-14 9:22 ` yottui at yahoo dot co dot jp
2010-07-14 12:25 ` yottui at yahoo dot co dot jp
` (12 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: yottui at yahoo dot co dot jp @ 2010-07-14 9:22 UTC (permalink / raw)
To: gcc-bugs
------- Comment #15 from yottui at yahoo dot co dot jp 2010-07-14 09:22 -------
I found the similar case with gcc 4.4.4 of MacPorts and gcc 4.4.0 of MinGW.
-- begin testcase --
// g++ -O -msse2 test.cpp
typedef long long __m128i __attribute__ ((__vector_size__ (16),
__may_alias__));
struct vec
{
__m128i v;
static vec load(const int * p)
{ return (__m128i) __builtin_ia32_loaddqu((char const *)p); }
const int & operator [](int i) const
{
union u {
__m128i v;
int e[4];
};
return ((const u &)v).e[i];
}
vec() {}
vec(const __m128i & a) : v(a) {}
};
extern "C" {
int printf (const char*, ...);
}
int main( int argc, char * argv[] )
{
__attribute__((aligned(16))) int data[] =
{ 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5 };
vec a = vec::load(data);
printf("v: %d, %d, %d, %d\n", a[0], a[1], a[2], a[3]);
return 0;
}
-- end testcase --
-- begin output --
v: 16, 16, 14, 14
-- end output --
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
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2010-07-14 9:22 ` yottui at yahoo dot co dot jp
@ 2010-07-14 12:25 ` yottui at yahoo dot co dot jp
2010-07-14 14:03 ` sezeroz at gmail dot com
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From: yottui at yahoo dot co dot jp @ 2010-07-14 12:25 UTC (permalink / raw)
To: gcc-bugs
------- Comment #16 from yottui at yahoo dot co dot jp 2010-07-14 12:24 -------
This is also the wrong result with MinGW gcc 3.4.5.
I'm expecting that all component of v will be 2500.
4.4.4 of MacPorts, 4.5.0 of MacPorts, 4.4.0 of MinGW and 4.5.0-1 of MinGW were
worked fine.
This time, I did not check 3.4.6 of MacPorts.
I tried to install gcc34 of MacPorts, but failed.
-- begin testcase --
// g++ -O -msse2 test.cpp
#include <xmmintrin.h>
#include <emmintrin.h>
extern "C" int printf (const char*, ...);
// There is no _mm_castps_si128() in gcc 3.4
inline __m128i my_castps_si128(const __m128 & a)
{
//return *(const __m128i *)&a; // same result
union u {
__m128 s;
__m128i i;
};
const u & v = (const u &)a;
return v.i;
}
inline __m128 my_castsi128_ps(const __m128i & a)
{
//return *(const __m128 *)&a; // same result
union u {
__m128 s;
__m128i i;
};
const u & v = (const u &)a;
return v.s;
}
int main( int argc, char * argv[] )
{
union u {
__m128i v;
int e[4];
};
__m128i a = _mm_set1_epi32(1250);
__m128i b = _mm_set1_epi32(2);
__m128i v0 = _mm_setzero_si128();
__m128i al = _mm_unpacklo_epi32(a, v0);
__m128i ah = _mm_unpackhi_epi32(a, v0);
__m128i bl = _mm_unpacklo_epi32(b, v0);
__m128i bh = _mm_unpackhi_epi32(b, v0);
__m128i lo = _mm_mul_epu32(al, bl);
__m128i hi = _mm_mul_epu32(ah, bh);
__m128 sl = my_castsi128_ps(lo);
__m128 sh = my_castsi128_ps(hi);
__m128 s = _mm_shuffle_ps(sl, sh, 0x88); // 2, 0, 2, 0
__m128i r = my_castps_si128(s);
u & v = (u &)r;
printf("v: %d, %d, %d, %d\n", v.e[0], v.e[1], v.e[2], v.e[3]);
return 0;
}
-- end testcase --
-- begin output --
v: 0, 0, 2500, 2500
-- end output --
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (15 preceding siblings ...)
2010-07-14 12:25 ` yottui at yahoo dot co dot jp
@ 2010-07-14 14:03 ` sezeroz at gmail dot com
2010-07-14 14:05 ` sezeroz at gmail dot com
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From: sezeroz at gmail dot com @ 2010-07-14 14:03 UTC (permalink / raw)
To: gcc-bugs
------- Comment #17 from sezeroz at gmail dot com 2010-07-14 14:02 -------
(In reply to comment #16)
> This is also the wrong result with MinGW gcc 3.4.5.
> I'm expecting that all component of v will be 2500.
>
> 4.4.4 of MacPorts, 4.5.0 of MacPorts, 4.4.0 of MinGW and 4.5.0-1 of MinGW were
> worked fine.
>
> This time, I did not check 3.4.6 of MacPorts.
> I tried to install gcc34 of MacPorts, but failed.
>
> -- begin testcase --
> // g++ -O -msse2 test.cpp
> #include <xmmintrin.h>
> #include <emmintrin.h>
>
> extern "C" int printf (const char*, ...);
>
> // There is no _mm_castps_si128() in gcc 3.4
> inline __m128i my_castps_si128(const __m128 & a)
> {
> //return *(const __m128i *)&a; // same result
>
> union u {
> __m128 s;
> __m128i i;
> };
> const u & v = (const u &)a;
>
> return v.i;
> }
>
> inline __m128 my_castsi128_ps(const __m128i & a)
> {
> //return *(const __m128 *)&a; // same result
>
> union u {
> __m128 s;
> __m128i i;
> };
> const u & v = (const u &)a;
>
> return v.s;
> }
>
> int main( int argc, char * argv[] )
> {
>
> union u {
> __m128i v;
> int e[4];
> };
> __m128i a = _mm_set1_epi32(1250);
> __m128i b = _mm_set1_epi32(2);
> __m128i v0 = _mm_setzero_si128();
> __m128i al = _mm_unpacklo_epi32(a, v0);
> __m128i ah = _mm_unpackhi_epi32(a, v0);
> __m128i bl = _mm_unpacklo_epi32(b, v0);
> __m128i bh = _mm_unpackhi_epi32(b, v0);
> __m128i lo = _mm_mul_epu32(al, bl);
> __m128i hi = _mm_mul_epu32(ah, bh);
> __m128 sl = my_castsi128_ps(lo);
> __m128 sh = my_castsi128_ps(hi);
> __m128 s = _mm_shuffle_ps(sl, sh, 0x88); // 2, 0, 2, 0
> __m128i r = my_castps_si128(s);
>
> u & v = (u &)r;
> printf("v: %d, %d, %d, %d\n", v.e[0], v.e[1], v.e[2], v.e[3]);
>
> return 0;
> }
> -- end testcase --
>
> -- begin output --
> v: 0, 0, 2500, 2500
> -- end output --
>
--
sezeroz at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sezeroz at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
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2010-07-14 14:03 ` sezeroz at gmail dot com
@ 2010-07-14 14:05 ` sezeroz at gmail dot com
2010-07-14 15:52 ` hjl dot tools at gmail dot com
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From: sezeroz at gmail dot com @ 2010-07-14 14:05 UTC (permalink / raw)
To: gcc-bugs
------- Comment #18 from sezeroz at gmail dot com 2010-07-14 14:05 -------
(In reply to comment #15)
> I found the similar case with gcc 4.4.4 of MacPorts and gcc 4.4.0 of MinGW.
>
This case fails with 4.4 on i686-linux too, printing 16, 16, 14, 14 instead of
16, 15, 14, 13 which 4.3 does.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
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2010-07-14 14:05 ` sezeroz at gmail dot com
@ 2010-07-14 15:52 ` hjl dot tools at gmail dot com
2010-07-14 16:41 ` pinskia at gcc dot gnu dot org
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From: hjl dot tools at gmail dot com @ 2010-07-14 15:52 UTC (permalink / raw)
To: gcc-bugs
------- Comment #19 from hjl dot tools at gmail dot com 2010-07-14 15:52 -------
(In reply to comment #15)
> I found the similar case with gcc 4.4.4 of MacPorts and gcc 4.4.0 of MinGW.
>
> -- begin testcase --
> // g++ -O -msse2 test.cpp
> typedef long long __m128i __attribute__ ((__vector_size__ (16),
> __may_alias__));
>
> struct vec
> {
> __m128i v;
>
> static vec load(const int * p)
> { return (__m128i) __builtin_ia32_loaddqu((char const *)p); }
>
> const int & operator [](int i) const
> {
> union u {
> __m128i v;
> int e[4];
> };
>
> return ((const u &)v).e[i];
> }
>
> vec() {}
> vec(const __m128i & a) : v(a) {}
> };
>
> extern "C" {
> int printf (const char*, ...);
> }
>
> int main( int argc, char * argv[] )
> {
> __attribute__((aligned(16))) int data[] =
> { 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5 };
>
> vec a = vec::load(data);
>
> printf("v: %d, %d, %d, %d\n", a[0], a[1], a[2], a[3]);
>
> return 0;
> }
> -- end testcase --
>
> -- begin output --
> v: 16, 16, 14, 14
> -- end output --
>
This is caused by revision 134947:
http://gcc.gnu.org/ml/gcc-cvs/2008-05/msg00107.html
--
hjl dot tools at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |pinskia at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (18 preceding siblings ...)
2010-07-14 15:52 ` hjl dot tools at gmail dot com
@ 2010-07-14 16:41 ` pinskia at gcc dot gnu dot org
2010-07-14 16:45 ` pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2010-07-14 16:41 UTC (permalink / raw)
To: gcc-bugs
------- Comment #20 from pinskia at gcc dot gnu dot org 2010-07-14 16:41 -------
(In reply to comment #15)
> I found the similar case with gcc 4.4.4 of MacPorts and gcc 4.4.0 of MinGW.
I think the code in comment #15 is invalid and voilates C/C++ aliasing rules.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (19 preceding siblings ...)
2010-07-14 16:41 ` pinskia at gcc dot gnu dot org
@ 2010-07-14 16:45 ` pinskia at gcc dot gnu dot org
2010-07-14 16:51 ` pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2010-07-14 16:45 UTC (permalink / raw)
To: gcc-bugs
------- Comment #21 from pinskia at gcc dot gnu dot org 2010-07-14 16:44 -------
(In reply to comment #20)
> (In reply to comment #15)
> > I found the similar case with gcc 4.4.4 of MacPorts and gcc 4.4.0 of MinGW.
> I think the code in comment #15 is invalid and voilates C/C++ aliasing rules.
Even if it did not voilate aliasing rules, the IR looks good:
D.4999_70 = VIEW_CONVERT_EXPR<const union u>(D.4995_68).i;
D.4863_25 = VIEW_CONVERT_EXPR<union u>(D.4999_70).e[3];
D.4864_26 = VIEW_CONVERT_EXPR<union u>(D.4999_70).e[2];
D.4865_27 = VIEW_CONVERT_EXPR<union u>(D.4999_70).e[1];
D.4866_28 = VIEW_CONVERT_EXPR<union u>(D.4999_70).e[0];
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (20 preceding siblings ...)
2010-07-14 16:45 ` pinskia at gcc dot gnu dot org
@ 2010-07-14 16:51 ` pinskia at gcc dot gnu dot org
2010-07-15 3:45 ` yottui at yahoo dot co dot jp
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From: pinskia at gcc dot gnu dot org @ 2010-07-14 16:51 UTC (permalink / raw)
To: gcc-bugs
------- Comment #22 from pinskia at gcc dot gnu dot org 2010-07-14 16:50 -------
(In reply to comment #21)
> Even if it did not voilate aliasing rules, the IR looks good:
The expansion looks incorrect though:
(insn 39 38 40 t.cc:55 (set (reg:DI 107)
(vec_select:DI (reg:V2DI 79 [ D.4999 ])
(parallel [
(const_int 1 [0x1])
]))) -1 (nil))
(insn 40 39 41 t.cc:55 (set (reg:DI 108)
(vec_select:DI (reg:V2DI 79 [ D.4999 ])
(parallel [
(const_int 1 [0x1])
]))) -1 (nil))
(insn 41 40 42 t.cc:55 (set (reg:DI 109)
(vec_select:DI (reg:V2DI 79 [ D.4999 ])
(parallel [
(const_int 0 [0x0])
]))) -1 (nil))
(insn 42 41 43 t.cc:55 (set (reg:DI 110)
(vec_select:DI (reg:V2DI 79 [ D.4999 ])
(parallel [
(const_int 0 [0x0])
]))) -1 (nil))
(insn 43 42 44 t.cc:55 (set (reg:SI 37 r8)
(subreg:SI (reg:DI 107) 0)) -1 (nil))
(insn 44 43 45 t.cc:55 (set (reg:SI 2 cx)
(subreg:SI (reg:DI 108) 0)) -1 (nil))
(insn 45 44 46 t.cc:55 (set (reg:SI 1 dx)
(subreg:SI (reg:DI 109) 0)) -1 (nil))
(insn 46 45 47 t.cc:55 (set (reg:SI 4 si)
(subreg:SI (reg:DI 110) 0)) -1 (nil))
Please file that as a different bug.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (21 preceding siblings ...)
2010-07-14 16:51 ` pinskia at gcc dot gnu dot org
@ 2010-07-15 3:45 ` yottui at yahoo dot co dot jp
2010-07-19 13:45 ` jamborm at gcc dot gnu dot org
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From: yottui at yahoo dot co dot jp @ 2010-07-15 3:45 UTC (permalink / raw)
To: gcc-bugs
------- Comment #23 from yottui at yahoo dot co dot jp 2010-07-15 03:45 -------
(In reply to comment #22)
> Please file that as a different bug.
May I enter comment #15 as a new bug to Bugzilla?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
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2010-07-15 3:45 ` yottui at yahoo dot co dot jp
@ 2010-07-19 13:45 ` jamborm at gcc dot gnu dot org
2010-07-20 13:34 ` jamborm at gcc dot gnu dot org
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From: jamborm at gcc dot gnu dot org @ 2010-07-19 13:45 UTC (permalink / raw)
To: gcc-bugs
--
jamborm at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |jamborm at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
Last reconfirmed|2010-07-11 11:25:40 |2010-07-19 13:45:37
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
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2010-07-19 13:45 ` jamborm at gcc dot gnu dot org
@ 2010-07-20 13:34 ` jamborm at gcc dot gnu dot org
2010-07-21 13:57 ` jamborm at gcc dot gnu dot org
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From: jamborm at gcc dot gnu dot org @ 2010-07-20 13:34 UTC (permalink / raw)
To: gcc-bugs
------- Comment #24 from jamborm at gcc dot gnu dot org 2010-07-20 13:34 -------
I posted a proposed fix to the mailing list:
http://gcc.gnu.org/ml/gcc-patches/2010-07/msg01570.html
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (24 preceding siblings ...)
2010-07-20 13:34 ` jamborm at gcc dot gnu dot org
@ 2010-07-21 13:57 ` jamborm at gcc dot gnu dot org
2010-07-21 14:17 ` jamborm at gcc dot gnu dot org
2010-07-21 17:21 ` jamborm at gcc dot gnu dot org
27 siblings, 0 replies; 29+ messages in thread
From: jamborm at gcc dot gnu dot org @ 2010-07-21 13:57 UTC (permalink / raw)
To: gcc-bugs
------- Comment #25 from jamborm at gcc dot gnu dot org 2010-07-21 13:57 -------
Subject: Bug 44900
Author: jamborm
Date: Wed Jul 21 13:57:12 2010
New Revision: 162374
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162374
Log:
2010-07-21 Martin Jambor <mjambor@suse.cz>
PR tree-optimization/44900
* tree-sra.c (load_assign_lhs_subreplacements): Updated comments.
(sra_modify_assign): Move gsi to the next statmenent unconditionally.
* testsuite/g++.dg/torture/pr44900.C: New test.
Added:
branches/gcc-4_5-branch/gcc/testsuite/g++.dg/torture/pr44900.C
Modified:
branches/gcc-4_5-branch/gcc/ChangeLog
branches/gcc-4_5-branch/gcc/testsuite/ChangeLog
branches/gcc-4_5-branch/gcc/tree-sra.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
` (25 preceding siblings ...)
2010-07-21 13:57 ` jamborm at gcc dot gnu dot org
@ 2010-07-21 14:17 ` jamborm at gcc dot gnu dot org
2010-07-21 17:21 ` jamborm at gcc dot gnu dot org
27 siblings, 0 replies; 29+ messages in thread
From: jamborm at gcc dot gnu dot org @ 2010-07-21 14:17 UTC (permalink / raw)
To: gcc-bugs
------- Comment #26 from jamborm at gcc dot gnu dot org 2010-07-21 14:17 -------
Subject: Bug 44900
Author: jamborm
Date: Wed Jul 21 14:17:11 2010
New Revision: 162375
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162375
Log:
2010-07-21 Martin Jambor <mjambor@suse.cz>
PR tree-optimization/44900
* tree-sra.c (load_assign_lhs_subreplacements): Updated comments.
(sra_modify_assign): Move gsi to the next statmenent unconditionally.
* testsuite/g++.dg/torture/pr44900.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/torture/pr44900.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-sra.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
^ permalink raw reply [flat|nested] 29+ messages in thread
* [Bug tree-optimization/44900] [4.5 Regression] The variable of SSE will be broken
2010-07-10 8:28 [Bug c++/44900] New: The variable of SSE will be broken yottui at yahoo dot co dot jp
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2010-07-21 14:17 ` jamborm at gcc dot gnu dot org
@ 2010-07-21 17:21 ` jamborm at gcc dot gnu dot org
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From: jamborm at gcc dot gnu dot org @ 2010-07-21 17:21 UTC (permalink / raw)
To: gcc-bugs
------- Comment #27 from jamborm at gcc dot gnu dot org 2010-07-21 17:21 -------
Fixed.
--
jamborm at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44900
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2010-07-21 13:57 ` jamborm at gcc dot gnu dot org
2010-07-21 14:17 ` jamborm at gcc dot gnu dot org
2010-07-21 17:21 ` jamborm at gcc dot gnu dot org
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