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MIPS: math-emu: Don't pass qNaNs through quieting handlers

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Don't call the `ieee754sp_nanxcpt' and `ieee754dp_nanxcpt' sNaN quieting
handlers for a qNaN supplied to floating-point format conversions or
SQRT.S/SQRT.D instructions, or for a qNaN produced out of a negative
operand supplied to SQRT.S/SQRT.D instructions.  Return the qNaN right
away in these cases.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9687/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Maciej W. Rozycki 2015-04-03 23:25:30 +01:00 committed by Ralf Baechle
parent d19cf86e2e
commit 539bfb579b
4 changed files with 8 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/mips/math-emu/dp_fsp.c
View file

@ -44,7 +44,7 @@ union ieee754dp ieee754dp_fsp(union ieee754sp x)
return ieee754dp_nanxcpt(ieee754dp_indef()); return ieee754dp_nanxcpt(ieee754dp_indef());
case IEEE754_CLASS_QNAN: case IEEE754_CLASS_QNAN:
return ieee754dp_nanxcpt(ieee754dp_nan_fsp(xs, xm)); return ieee754dp_nan_fsp(xs, xm);
case IEEE754_CLASS_INF: case IEEE754_CLASS_INF:
return ieee754dp_inf(xs); return ieee754dp_inf(xs);

6
arch/mips/math-emu/dp_sqrt.c
View file

@ -44,7 +44,7 @@ union ieee754dp ieee754dp_sqrt(union ieee754dp x)
switch (xc) { switch (xc) {
case IEEE754_CLASS_QNAN: case IEEE754_CLASS_QNAN:
/* sqrt(Nan) = Nan */ /* sqrt(Nan) = Nan */
return ieee754dp_nanxcpt(x); return x;
case IEEE754_CLASS_SNAN: case IEEE754_CLASS_SNAN:
ieee754_setcx(IEEE754_INVALID_OPERATION); ieee754_setcx(IEEE754_INVALID_OPERATION);
@ -58,7 +58,7 @@ union ieee754dp ieee754dp_sqrt(union ieee754dp x)
if (xs) { if (xs) {
/* sqrt(-Inf) = Nan */ /* sqrt(-Inf) = Nan */
ieee754_setcx(IEEE754_INVALID_OPERATION); ieee754_setcx(IEEE754_INVALID_OPERATION);
return ieee754dp_nanxcpt(ieee754dp_indef()); return ieee754dp_indef();
} }
/* sqrt(+Inf) = Inf */ /* sqrt(+Inf) = Inf */
return x; return x;
@ -71,7 +71,7 @@ union ieee754dp ieee754dp_sqrt(union ieee754dp x)
if (xs) { if (xs) {
/* sqrt(-x) = Nan */ /* sqrt(-x) = Nan */
ieee754_setcx(IEEE754_INVALID_OPERATION); ieee754_setcx(IEEE754_INVALID_OPERATION);
return ieee754dp_nanxcpt(ieee754dp_indef()); return ieee754dp_indef();
} }
break; break;
} }

2
arch/mips/math-emu/sp_fdp.c
View file

@ -50,7 +50,7 @@ union ieee754sp ieee754sp_fdp(union ieee754dp x)
nan = ieee754sp_nan_fdp(xs, xm); nan = ieee754sp_nan_fdp(xs, xm);
if (!ieee754sp_isnan(nan)) if (!ieee754sp_isnan(nan))
nan = ieee754sp_indef(); nan = ieee754sp_indef();
return ieee754sp_nanxcpt(nan); return nan;
case IEEE754_CLASS_INF: case IEEE754_CLASS_INF:
return ieee754sp_inf(xs); return ieee754sp_inf(xs);

6
arch/mips/math-emu/sp_sqrt.c
View file

@ -37,7 +37,7 @@ union ieee754sp ieee754sp_sqrt(union ieee754sp x)
switch (xc) { switch (xc) {
case IEEE754_CLASS_QNAN: case IEEE754_CLASS_QNAN:
/* sqrt(Nan) = Nan */ /* sqrt(Nan) = Nan */
return ieee754sp_nanxcpt(x); return x;
case IEEE754_CLASS_SNAN: case IEEE754_CLASS_SNAN:
ieee754_setcx(IEEE754_INVALID_OPERATION); ieee754_setcx(IEEE754_INVALID_OPERATION);
@ -51,7 +51,7 @@ union ieee754sp ieee754sp_sqrt(union ieee754sp x)
if (xs) { if (xs) {
/* sqrt(-Inf) = Nan */ /* sqrt(-Inf) = Nan */
ieee754_setcx(IEEE754_INVALID_OPERATION); ieee754_setcx(IEEE754_INVALID_OPERATION);
return ieee754sp_nanxcpt(ieee754sp_indef()); return ieee754sp_indef();
} }
/* sqrt(+Inf) = Inf */ /* sqrt(+Inf) = Inf */
return x; return x;
@ -61,7 +61,7 @@ union ieee754sp ieee754sp_sqrt(union ieee754sp x)
if (xs) { if (xs) {
/* sqrt(-x) = Nan */ /* sqrt(-x) = Nan */
ieee754_setcx(IEEE754_INVALID_OPERATION); ieee754_setcx(IEEE754_INVALID_OPERATION);
return ieee754sp_nanxcpt(ieee754sp_indef()); return ieee754sp_indef();
} }
break; break;
} }