gcc:

	* config/alpha/crtfastmath.c: Move to ../libgcc/config/alpha.
	* config/alpha/t-crtfm: Remove.
	* config/i386/crtfastmath.c: Move to ../libgcc/config/i386.
	* config/i386/t-crtfm: Remove.
	* config/ia64/crtfastmath.c: Move to ../libgcc/config/ia64.
	* config/mips/crtfastmath.c: Move to ../libgcc/config/mips.
	* config/sparc/crtfastmath.c: Move to ../libgcc/config/sparc.
	* config/sparc/t-crtfm: Remove.

	* config.gcc (alpha*-*-linux*): Remove alpha/t-crtfm from tmake_file.
	(alpha*-*-freebsd*): Likewise.
	(i[34567]86-*-darwin*): Remove i386/t-crtfm from tmake_file.
	(x86_64-*-darwin*): Likewise.
	(i[34567]86-*-linux*): Likewise.
	(x86_64-*-linux*): Likewise.
	(x86_64-*-mingw*): Likewise.
	(ia64*-*-elf*): Remove crtfastmath.o from extra_parts.
	(ia64*-*-freebsd*): Likewise.
	(ia64*-*-linux*): Likewise.
	(mips64*-*-linux*): Likewise.
	(mips*-*-linux*): Likewise.
	(sparc-*-linux*): Remove sparc/t-crtfm from tmake_file.
	(sparc64-*-linux*): Likewise.
	(sparc64-*-freebsd*): Likewise.

	libgcc:
	* config/alpha/crtfastmath.c: New file.
	* config/i386/crtfastmath.c: New file.
	* config/ia64/crtfastmath.c: New file.
	* config/mips/crtfastmath.c: New file.
	* config/sparc/crtfastmath.c: New file.

	* config/t-crtfm (crtfastmath.o): Use $(srcdir) to refer to
	crtfastmath.c.
	Add -frandom-seed=gcc-crtfastmath.
	* config/alpha/t-crtfm: Remove.
	* config/i386/t-crtfm: Use $(srcdir) to refer to crtfastmath.c.
	* config/ia64/t-ia64 (crtfastmath.o): Remove.

	* config.host (alpha*-*-linux*): Replace alpha/t-crtfm by t-crtfm.
	(alpha*-dec-osf5.1*): Likewise.
	(alpha*-*-freebsd*): Add t-crtfm to tmake_file.
	Add crtfastmath.o to extra_parts.
	(i[34567]86-*-darwin*): Add i386/t-crtfm to tmake_file.
	Add crtfastmath.o to extra_parts.
	(x86_64-*-darwin*): Likewise.
	(x86_64-*-mingw*): Likewise.
	(ia64*-*-elf*): Add t-crtfm to tmake_file.
	(ia64*-*-freebsd*): Likewise.
	(ia64*-*-linux*): Likewise.
	(sparc64-*-freebsd*): Add t-crtfm to tmake_file.
	Add crtfastmath.o to extra_parts.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@176241 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 131 insertions, 0 deletions

diff --git a/libgcc/config/i386/crtfastmath.c b/libgcc/config/i386/crtfastmath.c
new file mode 100644
index 00000000000..7abe500e981
--- /dev/null
+++ b/libgcc/config/i386/crtfastmath.c
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2005, 2007, 2009, 2011 Free Software Foundation, Inc.
+ *
+ * This file is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 3, or (at your option) any
+ * later version.
+ * 
+ * This file 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
+ * General Public License for more details.
+ * 
+ * Under Section 7 of GPL version 3, you are granted additional
+ * permissions described in the GCC Runtime Library Exception, version
+ * 3.1, as published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License and
+ * a copy of the GCC Runtime Library Exception along with this program;
+ * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#define MXCSR_DAZ (1 << 6)	/* Enable denormals are zero mode */
+#define MXCSR_FTZ (1 << 15)	/* Enable flush to zero mode */
+
+#ifndef __x86_64__
+/* All 64-bit targets have SSE and DAZ;
+   only check them explicitly for 32-bit ones. */
+#include "cpuid.h"
+#endif
+
+#if !defined __x86_64__ && defined __sun__ && defined __svr4__
+#include <signal.h>
+#include <ucontext.h>
+
+static volatile sig_atomic_t sigill_caught;
+
+static void
+sigill_hdlr (int sig __attribute((unused)),
+	     siginfo_t *sip __attribute__((unused)),
+	     ucontext_t *ucp)
+{
+  sigill_caught = 1;
+  /* Set PC to the instruction after the faulting one to skip over it,
+     otherwise we enter an infinite loop.  3 is the size of the movaps
+     instruction.  */
+  ucp->uc_mcontext.gregs[EIP] += 3;
+  setcontext (ucp);
+}
+#endif
+
+static void __attribute__((constructor))
+#ifndef __x86_64__
+/* The i386 ABI only requires 4-byte stack alignment, so this is necessary
+   to make sure the fxsave struct gets correct alignment.
+   See PR27537 and PR28621.  */
+__attribute__ ((force_align_arg_pointer))
+#endif
+set_fast_math (void)
+{
+#ifndef __x86_64__
+  unsigned int eax, ebx, ecx, edx;
+
+  if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
+    return;
+
+  if (edx & bit_SSE)
+    {
+      unsigned int mxcsr;
+  
+#if defined __sun__ && defined __svr4__
+      /* Solaris 2 before Solaris 9 4/04 cannot execute SSE instructions even
+	 if the CPU supports them.  Programs receive SIGILL instead, so check
+	 for that at runtime.  */
+      struct sigaction act, oact;
+
+      act.sa_handler = sigill_hdlr;
+      sigemptyset (&act.sa_mask);
+      /* Need to set SA_SIGINFO so a ucontext_t * is passed to the handler.  */
+      act.sa_flags = SA_SIGINFO;
+      sigaction (SIGILL, &act, &oact);
+
+      /* We need a single SSE instruction here so the handler can safely skip
+	 over it.  */
+      __asm__ volatile ("movaps %xmm0,%xmm0");
+
+      sigaction (SIGILL, &oact, NULL);
+
+      if (sigill_caught)
+	return;
+#endif /* __sun__ && __svr4__ */
+
+      mxcsr = __builtin_ia32_stmxcsr () | MXCSR_FTZ;
+
+      if (edx & bit_FXSAVE)
+	{
+	  /* Check if DAZ is available.  */
+	  struct
+	    {
+	      unsigned short int cwd;
+	      unsigned short int swd;
+	      unsigned short int twd;
+	      unsigned short int fop;
+	      long int fip;
+	      long int fcs;
+	      long int foo;
+	      long int fos;
+	      long int mxcsr;
+	      long int mxcsr_mask;
+	      long int st_space[32];
+	      long int xmm_space[32];
+	      long int padding[56];
+	    } __attribute__ ((aligned (16))) fxsave;
+
+	  __builtin_memset (&fxsave, 0, sizeof (fxsave));
+
+	  asm volatile ("fxsave %0" : "=m" (fxsave) : "m" (fxsave));
+
+	  if (fxsave.mxcsr_mask & MXCSR_DAZ)
+	    mxcsr |= MXCSR_DAZ;
+	}
+
+      __builtin_ia32_ldmxcsr (mxcsr);
+    }
+#else
+  unsigned int mxcsr = __builtin_ia32_stmxcsr ();
+  mxcsr |= MXCSR_DAZ | MXCSR_FTZ;
+  __builtin_ia32_ldmxcsr (mxcsr);
+#endif
+}