diff options
| author | Maciej W. Rozycki <macro@linux-mips.org> | 2015-04-03 22:25:38 (GMT) |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-04-07 23:09:35 (GMT) |
| commit | c9a1084516e35ff4f1d5b83e77530ed019ca364b (patch) | |
| tree | de1cfa5b17d0e2db63616994f42fb12de8b207c6 /arch/mips/math-emu | |
| parent | d5afa7e905544a3d9e2bb29d9cafebc8e544c978 (diff) | |
| download | linux-c9a1084516e35ff4f1d5b83e77530ed019ca364b.tar.xz | |
MIPS: math-emu: Optimise NaN handling in comparisons
We have the input operands already classified in `ieee754sp_cmp' and
`ieee754dp_cmp' comparison operations, so use the class obtained to tell
NaNs and numbers apart rather than classifying inputs again for this
purpose, reducing the size of code by 24 and 40 instructions or 96 and
160 bytes respectively.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9689/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/math-emu')
| -rw-r--r-- | arch/mips/math-emu/dp_cmp.c | 2 | ||||
| -rw-r--r-- | arch/mips/math-emu/ieee754dp.c | 2 | ||||
| -rw-r--r-- | arch/mips/math-emu/ieee754int.h | 5 | ||||
| -rw-r--r-- | arch/mips/math-emu/ieee754sp.c | 2 | ||||
| -rw-r--r-- | arch/mips/math-emu/sp_cmp.c | 2 |
5 files changed, 9 insertions, 4 deletions
diff --git a/arch/mips/math-emu/dp_cmp.c b/arch/mips/math-emu/dp_cmp.c index f8fbb23..99623c1 100644 --- a/arch/mips/math-emu/dp_cmp.c +++ b/arch/mips/math-emu/dp_cmp.c @@ -35,7 +35,7 @@ int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cmp, int sig) FLUSHYDP; ieee754_clearcx(); /* Even clear inexact flag here */ - if (ieee754dp_isnan(x) || ieee754dp_isnan(y)) { + if (ieee754_class_nan(xc) || ieee754_class_nan(yc)) { if (sig || xc == IEEE754_CLASS_SNAN || yc == IEEE754_CLASS_SNAN) ieee754_setcx(IEEE754_INVALID_OPERATION); diff --git a/arch/mips/math-emu/ieee754dp.c b/arch/mips/math-emu/ieee754dp.c index 49c811a..921535b 100644 --- a/arch/mips/math-emu/ieee754dp.c +++ b/arch/mips/math-emu/ieee754dp.c @@ -32,7 +32,7 @@ int ieee754dp_class(union ieee754dp x) int ieee754dp_isnan(union ieee754dp x) { - return ieee754dp_class(x) >= IEEE754_CLASS_SNAN; + return ieee754_class_nan(ieee754dp_class(x)); } static inline int ieee754dp_issnan(union ieee754dp x) diff --git a/arch/mips/math-emu/ieee754int.h b/arch/mips/math-emu/ieee754int.h index f0365bb..05389d5 100644 --- a/arch/mips/math-emu/ieee754int.h +++ b/arch/mips/math-emu/ieee754int.h @@ -44,6 +44,11 @@ static inline int ieee754_setandtestcx(const unsigned int x) return ieee754_csr.mx & x; } +static inline int ieee754_class_nan(int xc) +{ + return xc >= IEEE754_CLASS_SNAN; +} + #define COMPXSP \ unsigned xm; int xe; int xs __maybe_unused; int xc diff --git a/arch/mips/math-emu/ieee754sp.c b/arch/mips/math-emu/ieee754sp.c index 21899ce..e48aaab 100644 --- a/arch/mips/math-emu/ieee754sp.c +++ b/arch/mips/math-emu/ieee754sp.c @@ -32,7 +32,7 @@ int ieee754sp_class(union ieee754sp x) int ieee754sp_isnan(union ieee754sp x) { - return ieee754sp_class(x) >= IEEE754_CLASS_SNAN; + return ieee754_class_nan(ieee754sp_class(x)); } static inline int ieee754sp_issnan(union ieee754sp x) diff --git a/arch/mips/math-emu/sp_cmp.c b/arch/mips/math-emu/sp_cmp.c index 5caf088..d765ba1 100644 --- a/arch/mips/math-emu/sp_cmp.c +++ b/arch/mips/math-emu/sp_cmp.c @@ -35,7 +35,7 @@ int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cmp, int sig) FLUSHYSP; ieee754_clearcx(); /* Even clear inexact flag here */ - if (ieee754sp_isnan(x) || ieee754sp_isnan(y)) { + if (ieee754_class_nan(xc) || ieee754_class_nan(yc)) { if (sig || xc == IEEE754_CLASS_SNAN || yc == IEEE754_CLASS_SNAN) ieee754_setcx(IEEE754_INVALID_OPERATION); |