Commit 48d6c643 authored by Kumar Gala's avatar Kumar Gala
Browse files

math-emu: Add support for reporting exact invalid exception 



Some architectures (like powerpc) provide status information on the exact
type of invalid exception.  This is pretty straight forward as we already
report invalid exceptions via FP_SET_EXCEPTION.

We add new flags (FP_EX_INVALID_*) the architecture code can define if it
wants the exact invalid exception reported.

We had to split out the INF/INF and 0/0 cases for divide to allow reporting
the two invalid forms properly.

Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 40d3057a

include/math-emu/op-common.h

+8 −4
Original line number Diff line number Diff line
@@ -73,7 +73,7 @@ do { \ 
	X##_c = FP_CLS_NAN;						\

	/* Check for signaling NaN */					\

	if (!(_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs))		\

	  FP_SET_EXCEPTION(FP_EX_INVALID);				\

	  FP_SET_EXCEPTION(FP_EX_INVALID | FP_EX_INVALID_SNAN);		\

      }									\

    break;								\

  }									\
@@ -324,7 +324,7 @@ do { \ 
	_FP_FRAC_SET_##wc(R, _FP_NANFRAC_##fs);				     \

	R##_s = _FP_NANSIGN_##fs;					     \

	R##_c = FP_CLS_NAN;						     \

	FP_SET_EXCEPTION(FP_EX_INVALID);				     \

	FP_SET_EXCEPTION(FP_EX_INVALID | FP_EX_INVALID_ISI);		     \

	break;								     \

      }									     \

    /* FALLTHRU */							     \
@@ -431,7 +431,7 @@ do { \ 
    R##_s = _FP_NANSIGN_##fs;				\

    R##_c = FP_CLS_NAN;					\

    _FP_FRAC_SET_##wc(R, _FP_NANFRAC_##fs);		\

    FP_SET_EXCEPTION(FP_EX_INVALID);			\

    FP_SET_EXCEPTION(FP_EX_INVALID | FP_EX_INVALID_IMZ);\

    break;						\

							\

  default:						\
@@ -490,11 +490,15 @@ do { \ 
    break;						\

							\

  case _FP_CLS_COMBINE(FP_CLS_INF,FP_CLS_INF):		\

    R##_s = _FP_NANSIGN_##fs;				\

    R##_c = FP_CLS_NAN;					\

    _FP_FRAC_SET_##wc(R, _FP_NANFRAC_##fs);		\

    FP_SET_EXCEPTION(FP_EX_INVALID | FP_EX_INVALID_IDI);\

  case _FP_CLS_COMBINE(FP_CLS_ZERO,FP_CLS_ZERO):	\

    R##_s = _FP_NANSIGN_##fs;				\

    R##_c = FP_CLS_NAN;					\

    _FP_FRAC_SET_##wc(R, _FP_NANFRAC_##fs);		\

    FP_SET_EXCEPTION(FP_EX_INVALID);			\

    FP_SET_EXCEPTION(FP_EX_INVALID | FP_EX_INVALID_ZDZ);\

    break;						\

							\

  default:						\

include/math-emu/soft-fp.h

+19 −0
Original line number Diff line number Diff line
@@ -51,6 +51,25 @@ 
#ifndef FP_EX_INVALID

#define FP_EX_INVALID		0

#endif

#ifndef FP_EX_INVALID_SNAN

#define FP_EX_INVALID_SNAN	0

#endif

/* inf - inf */

#ifndef FP_EX_INVALID_ISI

#define FP_EX_INVALID_ISI	0

#endif

/* inf / inf */

#ifndef FP_EX_INVALID_IDI

#define FP_EX_INVALID_IDI	0

#endif

/* 0 / 0 */

#ifndef FP_EX_INVALID_ZDZ

#define FP_EX_INVALID_ZDZ	0

#endif

/* inf * 0 */

#ifndef FP_EX_INVALID_IMZ

#define FP_EX_INVALID_IMZ	0

#endif

#ifndef FP_EX_OVERFLOW

#define FP_EX_OVERFLOW		0

#endif

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