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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>
This commit is contained in:
Maciej W. Rozycki 2015-04-03 23:25:38 +01:00 committed by Ralf Baechle
parent d5afa7e905
commit c9a1084516
5 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/mips/math-emu/dp_cmp.c
View File

@ -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);

2
arch/mips/math-emu/ieee754dp.c
View File

@ -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)

5
arch/mips/math-emu/ieee754int.h
View File

@ -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

2
arch/mips/math-emu/ieee754sp.c
View File

@ -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)

2
arch/mips/math-emu/sp_cmp.c
View File

@ -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);