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math-emu: Add support for reporting exact invalid exception

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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: Kumar Gala <galak@kernel.crashing.org>
Acked-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kumar Gala 2008-06-27 09:39:00 -05:00
parent 40d3057ac0
commit 48d6c64311
2 changed files with 27 additions and 4 deletions
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12
include/math-emu/op-common.h
View file

@ -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: \

19
include/math-emu/soft-fp.h
View file

@ -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