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or1k: Support for softfloat to emulate hw exceptions

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This allows the openrisc softfloat implementation to set exceptions.
This also sets the correct tininess after rounding value to be
consistent with hardware and simulator implementations.

libgcc/ChangeLog:

	* config/or1k/sfp-machine.h (FP_RND_NEAREST, FP_RND_ZERO,
	FP_RND_PINF, FP_RND_MINF, FP_RND_MASK, FP_EX_OVERFLOW,
	FP_EX_UNDERFLOW, FP_EX_INEXACT, FP_EX_INVALID, FP_EX_DIVZERO,
	FP_EX_ALL): New constant macros.
	(_FP_DECL_EX, FP_ROUNDMODE, FP_INIT_ROUNDMODE,
	FP_HANDLE_EXCEPTIONS): New macros.
	(_FP_TININESS_AFTER_ROUNDING): Change to 1.
This commit is contained in:
Stafford Horne 2020-01-24 21:30:31 +09:00
parent e1171c3250
commit b77f6d2fa8
1 changed files with 40 additions and 1 deletions
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41
libgcc/config/or1k/sfp-machine.h
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@ -41,12 +41,51 @@
R##_c = FP_CLS_NAN; \
} while (0)
/* Handle getting and setting rounding mode for soft fp operations. */
#define FP_RND_NEAREST (0x0 << 1)
#define FP_RND_ZERO (0x1 << 1)
#define FP_RND_PINF (0x2 << 1)
#define FP_RND_MINF (0x3 << 1)
#define FP_RND_MASK (0x3 << 1)
#define FP_EX_OVERFLOW 1 << 3
#define FP_EX_UNDERFLOW 1 << 4
#define FP_EX_INEXACT 1 << 8
#define FP_EX_INVALID 1 << 9
#define FP_EX_DIVZERO 1 << 11
#define FP_EX_ALL \
(FP_EX_INVALID | FP_EX_DIVZERO | FP_EX_OVERFLOW | FP_EX_UNDERFLOW \
| FP_EX_INEXACT)
#define _FP_DECL_EX \
unsigned int _fpcsr __attribute__ ((unused)) = FP_RND_NEAREST
#define FP_ROUNDMODE (_fpcsr & FP_RND_MASK)
#ifdef __or1k_hard_float__
#define FP_INIT_ROUNDMODE \
do { \
__asm__ volatile ("l.mfspr %0,r0,20" : "=r" (_fpcsr)); \
} while (0)
#define FP_HANDLE_EXCEPTIONS \
do { \
if (__builtin_expect (_fex, 0)) \
{ \
_fpcsr &= ~FP_EX_ALL; \
_fpcsr |= _fex; \
__asm__ volatile ("l.mtspr r0,%0,20" : : "r" (_fpcsr)); \
} \
} while (0)
#endif
#define __LITTLE_ENDIAN 1234
#define __BIG_ENDIAN 4321
#define __BYTE_ORDER __BIG_ENDIAN
#define _FP_TININESS_AFTER_ROUNDING 0
#define _FP_TININESS_AFTER_ROUNDING 1
/* Define ALIASNAME as a strong alias for NAME. */
# define strong_alias(name, aliasname) _strong_alias(name, aliasname)