mirror/gcc
2
0
Fork 0
mirror of git://gcc.gnu.org/git/gcc.git synced 2025-04-24 22:11:56 +08:00
Code Issues Packages Projects Releases Wiki Activity

sfp-machine.h (_FP_DECL_EX): Declare _fpsr as a union of u64 and double.

Browse Source 
2016-02-26  Paul E. Murphy  <murphyp@linux.vnet.ibm.com>
	    Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* config/rs6000/sfp-machine.h (_FP_DECL_EX): Declare _fpsr as a
	union of u64 and double.
	(FP_TRAPPING_EXCEPTIONS): Return a bitmask of trapping exceptions.
	(FP_INIT_ROUNDMODE): Read the fpscr instead of writing a mystery
	value.
	(FP_ROUNDMODE): Update the usage of _fpscr.


Co-Authored-By: Bill Schmidt <wschmidt@linux.vnet.ibm.com>

From-SVN: r233756
This commit is contained in:
Paul E. Murphy 2016-02-26 19:20:54 +00:00 committed by William Schmidt
parent d1f2bea53f
commit 47dfdc53cd
2 changed files with 23 additions and 9 deletions
libgcc
ChangeLog
config/rs6000
sfp-machine.h

10
libgcc/ChangeLog

@ -1,3 +1,13 @@
2016-02-26 Paul E. Murphy <murphyp@linux.vnet.ibm.com>
Bill Schmidt <wschmidt@linux.vnet.ibm.com>
* config/rs6000/sfp-machine.h (_FP_DECL_EX): Declare _fpsr as a
union of u64 and double.
(FP_TRAPPING_EXCEPTIONS): Return a bitmask of trapping exceptions.
(FP_INIT_ROUNDMODE): Read the fpscr instead of writing a mystery
value.
(FP_ROUNDMODE): Update the usage of _fpscr.
2016-02-25 Ilya Verbin <ilya.verbin@intel.com>
PR driver/68463

22
libgcc/config/rs6000/sfp-machine.h

@ -130,10 +130,14 @@ void __sfp_handle_exceptions (int);
if (__builtin_expect (_fex, 0)) \
__sfp_handle_exceptions (_fex); \
} while (0);
/* A set bit indicates an exception is masked and a clear bit indicates it is
trapping. */
# define FP_TRAPPING_EXCEPTIONS (~_fpscr & (FP_EX_ALL >> 22))
/* The FP_EX_* bits track whether the exception has occurred. This macro
must set the FP_EX_* bits of those exceptions which are configured to
trap. The FPSCR bit which indicates this is 22 ISA bits above the
respective FP_EX_* bit. Note, the ISA labels bits from msb to lsb,
so 22 ISA bits above is 22 bits below when counted from the lsb. */
# define FP_TRAPPING_EXCEPTIONS ((_fpscr.i << 22) & FP_EX_ALL)
# define FP_RND_NEAREST 0x0
# define FP_RND_ZERO 0x1
# define FP_RND_PINF 0x2
@ -141,16 +145,16 @@ void __sfp_handle_exceptions (int);
# define FP_RND_MASK 0x3
# define _FP_DECL_EX \
unsigned long long _fpscr __attribute__ ((unused)) = FP_RND_NEAREST
union { unsigned long long i; double d; } _fpscr __attribute__ ((unused)) = \
{ .i = FP_RND_NEAREST }
#define FP_INIT_ROUNDMODE \
do { \
__asm__ __volatile__ ("mtfsf 255, %0" \
: \
: "f" (_fpscr)); \
__asm__ __volatile__ ("mffs %0" \
: "=f" (_fpscr.d)); \
} while (0)
# define FP_ROUNDMODE (_fpscr & FP_RND_MASK)
# define FP_ROUNDMODE (_fpscr.i & FP_RND_MASK)
#endif /* !__FLOAT128__ */
/* Define ALIASNAME as a strong alias for NAME. */