This patch fixes bug 16064, i386 fenv_t not including SSE state, using
the technique suggested there of storing the state in the existing
__eip field of fenv_t to avoid needing to increase the size of fenv_t
and add new symbol versions. The included testcase, which previously
failed for i386 (but passed for x86_64), illustrates how the previous
state was buggy.
This patch causes the SSE state to be included *to the extent it is on
x86_64*. Where some state should logically be included but isn't for
x86_64 (see bug 16068), this patch does not cause it to be included
for i386 either. The idea is that any patch fixing that bug should
fix it for both x86_64 and i386 at once.
Tested i386 and x86_64. (I haven't tested the case of a CPU without
SSE2 disabling the test.)
[BZ #16064]
* sysdeps/i386/fpu/fegetenv.c: Include <unistd.h>, <ldsodefs.h>
and <dl-procinfo.h>.
(__fegetenv): Save SSE state in envp->__eip if supported.
* sysdeps/i386/fpu/feholdexcpt.c (feholdexcept): Save SSE state in
envp->__eip if supported.
* sysdeps/i386/fpu/fesetenv.c: Include <unistd.h>, <ldsodefs.h>
and <dl-procinfo.h>.
(__fesetenv): Always set __eip, __cs_selector, __opcode,
__data_offset and __data_selector in environment to 0. Set SSE
state if supported.
* sysdeps/x86/fpu/Makefile [$(subdir) = math] (tests): Add
test-fenv-sse.
[$(subdir) = math] (CFLAGS-test-fenv-sse.c): Add -msse2
-mfpmath=sse.
* sysdeps/x86/fpu/test-fenv-sse.c: New file.
+2014-05-09 Joseph Myers <joseph@codesourcery.com>
+
+ [BZ #16064]
+ * sysdeps/i386/fpu/fegetenv.c: Include <unistd.h>, <ldsodefs.h>
+ and <dl-procinfo.h>.
+ (__fegetenv): Save SSE state in envp->__eip if supported.
+ * sysdeps/i386/fpu/feholdexcpt.c (feholdexcept): Save SSE state in
+ envp->__eip if supported.
+ * sysdeps/i386/fpu/fesetenv.c: Include <unistd.h>, <ldsodefs.h>
+ and <dl-procinfo.h>.
+ (__fesetenv): Always set __eip, __cs_selector, __opcode,
+ __data_offset and __data_selector in environment to 0. Set SSE
+ state if supported.
+ * sysdeps/x86/fpu/Makefile [$(subdir) = math] (tests): Add
+ test-fenv-sse.
+ [$(subdir) = math] (CFLAGS-test-fenv-sse.c): Add -msse2
+ -mfpmath=sse.
+ * sysdeps/x86/fpu/test-fenv-sse.c: New file.
+
2014-05-09 Will Newton <will.newton@linaro.org>
* sysdeps/arm/preconfigure.ac: Set libc_commonpagesize
* The following bugs are resolved with this release:
- 6804, 9894, 12994, 13347, 13651, 14308, 14770, 15119, 15347, 15514,
- 15804, 15894, 16002, 16198, 16284, 16348, 16349, 16357, 16362, 16447,
+ 6804, 9894, 12994, 13347, 13651, 14308, 14770, 15119, 15347, 15514, 15804,
+ 15894, 16002, 16064, 16198, 16284, 16348, 16349, 16357, 16362, 16447,
16532, 16545, 16574, 16599, 16600, 16609, 16610, 16611, 16613, 16619,
16623, 16629, 16632, 16634, 16639, 16642, 16648, 16649, 16670, 16674,
16677, 16680, 16683, 16689, 16695, 16701, 16706, 16707, 16712, 16713,
<http://www.gnu.org/licenses/>. */
#include <fenv.h>
+#include <unistd.h>
+#include <ldsodefs.h>
+#include <dl-procinfo.h>
int
__fegetenv (fenv_t *envp)
would block all exceptions. */
__asm__ ("fldenv %0" : : "m" (*envp));
+ if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
+ __asm__ ("stmxcsr %0" : "=m" (envp->__eip));
+
/* Success. */
return 0;
}
unsigned int xwork;
/* Get the current control word. */
- __asm__ ("stmxcsr %0" : "=m" (*&xwork));
+ __asm__ ("stmxcsr %0" : "=m" (envp->__eip));
/* Set all exceptions to non-stop and clear them. */
- xwork = (xwork | 0x1f80) & ~0x3f;
+ xwork = (envp->__eip | 0x1f80) & ~0x3f;
__asm__ ("ldmxcsr %0" : : "m" (*&xwork));
}
#include <fenv.h>
#include <assert.h>
+#include <unistd.h>
+#include <ldsodefs.h>
+#include <dl-procinfo.h>
int
temp.__control_word |= FE_ALL_EXCEPT;
temp.__control_word &= ~FE_TOWARDZERO;
temp.__status_word &= ~FE_ALL_EXCEPT;
- temp.__eip = 0;
- temp.__cs_selector = 0;
- temp.__opcode = 0;
- temp.__data_offset = 0;
- temp.__data_selector = 0;
}
else if (envp == FE_NOMASK_ENV)
{
temp.__control_word &= ~(FE_ALL_EXCEPT | FE_TOWARDZERO);
temp.__status_word &= ~FE_ALL_EXCEPT;
- temp.__eip = 0;
- temp.__cs_selector = 0;
- temp.__opcode = 0;
- temp.__data_offset = 0;
- temp.__data_selector = 0;
}
else
{
& (FE_ALL_EXCEPT | FE_TOWARDZERO));
temp.__status_word &= ~FE_ALL_EXCEPT;
temp.__status_word |= envp->__status_word & FE_ALL_EXCEPT;
- temp.__eip = envp->__eip;
- temp.__cs_selector = envp->__cs_selector;
- temp.__opcode = envp->__opcode;
- temp.__data_offset = envp->__data_offset;
- temp.__data_selector = envp->__data_selector;
}
+ temp.__eip = 0;
+ temp.__cs_selector = 0;
+ temp.__opcode = 0;
+ temp.__data_offset = 0;
+ temp.__data_selector = 0;
__asm__ ("fldenv %0" : : "m" (temp));
+ if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
+ {
+ unsigned int mxcsr;
+ __asm__ ("stmxcsr %0" : "=m" (mxcsr));
+
+ if (envp == FE_DFL_ENV)
+ {
+ /* Set mask for SSE MXCSR. */
+ mxcsr |= (FE_ALL_EXCEPT << 7);
+ /* Set rounding to FE_TONEAREST. */
+ mxcsr &= ~0x6000;
+ mxcsr |= (FE_TONEAREST << 3);
+ }
+ else if (envp == FE_NOMASK_ENV)
+ {
+ /* Do not mask exceptions. */
+ mxcsr &= ~(FE_ALL_EXCEPT << 7);
+ /* Set rounding to FE_TONEAREST. */
+ mxcsr &= ~0x6000;
+ mxcsr |= (FE_TONEAREST << 3);
+ }
+ else
+ mxcsr = envp->__eip;
+
+ __asm__ ("ldmxcsr %0" : : "m" (mxcsr));
+ }
+
/* Success. */
return 0;
}
ifeq ($(subdir),math)
libm-support += powl_helper
+tests += test-fenv-sse
+CFLAGS-test-fenv-sse.c += -msse2 -mfpmath=sse
endif
--- /dev/null
+/* Test floating-point environment includes SSE state (bug 16064).
+ Copyright (C) 2014 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <cpuid.h>
+#include <fenv.h>
+#include <float.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+static bool
+have_sse2 (void)
+{
+ unsigned int eax, ebx, ecx, edx;
+
+ if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
+ return false;
+
+ return (edx & bit_SSE2) != 0;
+}
+
+static __attribute__ ((noinline)) int
+sse_tests (void)
+{
+ int ret = 0;
+ fenv_t base_env;
+ if (fegetenv (&base_env) != 0)
+ {
+ puts ("fegetenv (&base_env) failed");
+ return 1;
+ }
+ if (fesetround (FE_UPWARD) != 0)
+ {
+ puts ("fesetround (FE_UPWARD) failed");
+ return 1;
+ }
+ if (fesetenv (&base_env) != 0)
+ {
+ puts ("fesetenv (&base_env) failed");
+ return 1;
+ }
+ volatile float a = 1.0f, b = FLT_MIN, c;
+ c = a + b;
+ if (c != 1.0f)
+ {
+ puts ("fesetenv did not restore rounding mode");
+ ret = 1;
+ }
+ if (fesetround (FE_DOWNWARD) != 0)
+ {
+ puts ("fesetround (FE_DOWNWARD) failed");
+ return 1;
+ }
+ if (feupdateenv (&base_env) != 0)
+ {
+ puts ("feupdateenv (&base_env) failed");
+ return 1;
+ }
+ volatile float d = -FLT_MIN, e;
+ e = a + d;
+ if (e != 1.0f)
+ {
+ puts ("feupdateenv did not restore rounding mode");
+ ret = 1;
+ }
+ if (fesetround (FE_UPWARD) != 0)
+ {
+ puts ("fesetround (FE_UPWARD) failed");
+ return 1;
+ }
+ fenv_t upward_env;
+ if (feholdexcept (&upward_env) != 0)
+ {
+ puts ("feholdexcept (&upward_env) failed");
+ return 1;
+ }
+ if (fesetround (FE_DOWNWARD) != 0)
+ {
+ puts ("fesetround (FE_DOWNWARD) failed");
+ return 1;
+ }
+ if (fesetenv (&upward_env) != 0)
+ {
+ puts ("fesetenv (&upward_env) failed");
+ return 1;
+ }
+ e = a + d;
+ if (e != 1.0f)
+ {
+ puts ("fesetenv did not restore rounding mode from feholdexcept");
+ ret = 1;
+ }
+ if (fesetround (FE_UPWARD) != 0)
+ {
+ puts ("fesetround (FE_UPWARD) failed");
+ return 1;
+ }
+ if (fesetenv (FE_DFL_ENV) != 0)
+ {
+ puts ("fesetenv (FE_DFL_ENV) failed");
+ return 1;
+ }
+ c = a + b;
+ if (c != 1.0f)
+ {
+ puts ("fesetenv (FE_DFL_ENV) did not restore rounding mode");
+ ret = 1;
+ }
+ return ret;
+}
+
+static int
+do_test (void)
+{
+ if (!have_sse2 ())
+ {
+ puts ("CPU does not support SSE2, cannot test");
+ return 0;
+ }
+ return sse_tests ();
+}
+
+#define TEST_FUNCTION do_test ()
+#include <test-skeleton.c>
projects / platform / upstream / linaro-glibc.git / commitdiff