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re PR target/27968 (gcc emits (undefined) ffreep opcode which is not understood by Solaris' /usr/ccs/bin/as when tuning for Athlon or Opteron CPUs) 

PR target/27968
	* configure.ac (HAVE_AS_IX86_FFREEP): On x86 targets check whether 
	the configured assembler supports the x87's ffreep mnemonic.
	* configure: Regenerate.
	* config.in: Regenerate.

	* config/i386/i386.c (output_387_ffreep): New function.
	(output_fp_compare): Use output_387_ffreep to emit ffreep insns.
	(output_387_reg_move): Likewise.

From-SVN: r115237
This commit is contained in:
Roger Sayle 2006-07-07 00:13:14 +00:00
parent 33251a2dc3
commit b6c03bcd80
5 changed files with 92 additions and 7 deletions
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15
gcc/ChangeLog
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@ -1,3 +1,15 @@
2006-07-06 Roger Sayle <roger@eyesopen.com>
PR target/27968
* configure.ac (HAVE_AS_IX86_FFREEP): On x86 targets check whether
the configured assembler supports the x87's ffreep mnemonic.
* configure: Regenerate.
* config.in: Regenerate.
* config/i386/i386.c (output_387_ffreep): New function.
(output_fp_compare): Use output_387_ffreep to emit ffreep insns.
(output_387_reg_move): Likewise.
2006-07-06 Paul Eggert <eggert@cs.ucla.edu>
Port to hosts whose 'sort' and 'tail' implementations
@ -10,7 +22,8 @@
2006-07-06 Zdenek Dvorak <dvorakz@suse.cz>
* tree-ssa-loop-niter.c (scev_probably_wraps_p): Fix typo in argument name.
* tree-ssa-loop-niter.c (scev_probably_wraps_p): Fix typo in
argument name.
2006-07-06 David Edelsohn <edelsohn@gnu.org>

6
gcc/config.in
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@ -203,6 +203,12 @@
#endif
/* Define if your assembler supports the ffreep mnemonic. */
#ifndef USED_FOR_TARGET
#undef HAVE_AS_IX86_FFREEP
#endif
/* Define if your assembler supports the lituse_jsrdirect relocation. */
#ifndef USED_FOR_TARGET
#undef HAVE_AS_JSRDIRECT_RELOCS

37
gcc/config/i386/i386.c
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@ -8641,6 +8641,34 @@ output_fix_trunc (rtx insn, rtx *operands, int fisttp)
return "";
}
/* Output code for x87 ffreep insn. The OPNO argument, which may only
have the values zero or one, indicates the ffreep insn's operand
from the OPERANDS array. */
static const char *
output_387_ffreep (rtx *operands ATTRIBUTE_UNUSED, int opno)
{
if (TARGET_USE_FFREEP)
#if HAVE_AS_IX86_FFREEP
return opno ? "ffreep\t%y1" : "ffreep\t%y0";
#else
switch (REGNO (operands[opno]))
{
case FIRST_STACK_REG + 0: return ".word\t0xc0df";
case FIRST_STACK_REG + 1: return ".word\t0xc1df";
case FIRST_STACK_REG + 2: return ".word\t0xc2df";
case FIRST_STACK_REG + 3: return ".word\t0xc3df";
case FIRST_STACK_REG + 4: return ".word\t0xc4df";
case FIRST_STACK_REG + 5: return ".word\t0xc5df";
case FIRST_STACK_REG + 6: return ".word\t0xc6df";
case FIRST_STACK_REG + 7: return ".word\t0xc7df";
}
#endif
return opno ? "fstp\t%y1" : "fstp\t%y0";
}
/* Output code for INSN to compare OPERANDS. EFLAGS_P is 1 when fcomi
should be used. UNORDERED_P is true when fucom should be used. */
@ -8685,7 +8713,7 @@ output_fp_compare (rtx insn, rtx *operands, int eflags_p, int unordered_p)
if (stack_top_dies)
{
output_asm_insn ("ftst\n\tfnstsw\t%0", operands);
return TARGET_USE_FFREEP ? "ffreep\t%y1" : "fstp\t%y1";
return output_387_ffreep (operands, 1);
}
else
return "ftst\n\tfnstsw\t%0";
@ -8708,7 +8736,7 @@ output_fp_compare (rtx insn, rtx *operands, int eflags_p, int unordered_p)
output_asm_insn ("fucomip\t{%y1, %0|%0, %y1}", operands);
else
output_asm_insn ("fcomip\t{%y1, %0|%0, %y1}", operands);
return TARGET_USE_FFREEP ? "ffreep\t%y0" : "fstp\t%y0";
return output_387_ffreep (operands, 0);
}
else
{
@ -18807,9 +18835,8 @@ output_387_reg_move (rtx insn, rtx *operands)
if (REG_P (operands[1])
&& find_regno_note (insn, REG_DEAD, REGNO (operands[1])))
{
if (REGNO (operands[0]) == FIRST_STACK_REG
&& TARGET_USE_FFREEP)
return "ffreep\t%y0";
if (REGNO (operands[0]) == FIRST_STACK_REG)
return output_387_ffreep (operands, 0);
return "fstp\t%y0";
}
if (STACK_TOP_P (operands[0]))

33
gcc/configure vendored
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@ -15046,6 +15046,39 @@ cat >>confdefs.h <<\_ACEOF
#define HAVE_AS_IX86_CMOV_SUN_SYNTAX 1
_ACEOF
fi
echo "$as_me:$LINENO: checking assembler for ffreep mnemonic" >&5
echo $ECHO_N "checking assembler for ffreep mnemonic... $ECHO_C" >&6
if test "${gcc_cv_as_ix86_ffreep+set}" = set; then
echo $ECHO_N "(cached) $ECHO_C" >&6
else
gcc_cv_as_ix86_ffreep=no
if test x$gcc_cv_as != x; then
echo 'ffreep %st(1)' > conftest.s
if { ac_try='$gcc_cv_as -o conftest.o conftest.s >&5'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; }
then
gcc_cv_as_ix86_ffreep=yes
else
echo "configure: failed program was" >&5
cat conftest.s >&5
fi
rm -f conftest.o conftest.s
fi
fi
echo "$as_me:$LINENO: result: $gcc_cv_as_ix86_ffreep" >&5
echo "${ECHO_T}$gcc_cv_as_ix86_ffreep" >&6
if test $gcc_cv_as_ix86_ffreep = yes; then
cat >>confdefs.h <<\_ACEOF
#define HAVE_AS_IX86_FFREEP 1
_ACEOF
fi
# This one is used unconditionally by i386.[ch]; it is to be defined

8
gcc/configure.ac
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@ -1,7 +1,7 @@
# configure.ac for GCC
# Process this file with autoconf to generate a configuration script.
# Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
# Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
# Free Software Foundation, Inc.
#This file is part of GCC.
@ -2815,6 +2815,12 @@ foo: nop
[AC_DEFINE(HAVE_AS_IX86_CMOV_SUN_SYNTAX, 1,
[Define if your assembler supports the Sun syntax for cmov.])])
gcc_GAS_CHECK_FEATURE([ffreep mnemonic],
gcc_cv_as_ix86_ffreep,,,
[ffreep %st(1)],,
[AC_DEFINE(HAVE_AS_IX86_FFREEP, 1,
[Define if your assembler supports the ffreep mnemonic.])])
# This one is used unconditionally by i386.[ch]; it is to be defined
# to 1 if the feature is present, 0 otherwise.
gcc_GAS_CHECK_FEATURE([GOTOFF in data],