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MIPS: Fix abs.[sd] and neg.[sd] emulation for NaN operands

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This patch ensures that the sign bit is always updated for NaN operands.

Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Nigel Stephens 2009-10-12 14:57:18 -07:00 • committed by Ralf Baechle
commit cea2be4443
2 changed files with 7 additions and 17 deletions
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13
arch/mips/math-emu/dp_simple.c
View file

@ -62,8 +62,6 @@ ieee754dp ieee754dp_neg(ieee754dp x)
return ieee754dp_nanxcpt(y, "neg"); return ieee754dp_nanxcpt(y, "neg");
} }
if (ieee754dp_isnan(x)) /* but not infinity */
return ieee754dp_nanxcpt(x, "neg", x);
return x; return x;
} }
@ -76,15 +74,12 @@ ieee754dp ieee754dp_abs(ieee754dp x)
CLEARCX; CLEARCX;
FLUSHXDP; FLUSHXDP;
/* Clear sign ALWAYS, irrespective of NaN */
DPSIGN(x) = 0;
if (xc == IEEE754_CLASS_SNAN) { if (xc == IEEE754_CLASS_SNAN) {
SETCX(IEEE754_INVALID_OPERATION); return ieee754dp_nanxcpt(ieee754dp_indef(), "abs");
return ieee754dp_nanxcpt(ieee754dp_indef(), "neg");
} }
if (ieee754dp_isnan(x)) /* but not infinity */
return ieee754dp_nanxcpt(x, "abs", x);
/* quick fix up */
DPSIGN(x) = 0;
return x; return x;
} }

11
arch/mips/math-emu/sp_simple.c
View file

@ -62,8 +62,6 @@ ieee754sp ieee754sp_neg(ieee754sp x)
return ieee754sp_nanxcpt(y, "neg"); return ieee754sp_nanxcpt(y, "neg");
} }
if (ieee754sp_isnan(x)) /* but not infinity */
return ieee754sp_nanxcpt(x, "neg", x);
return x; return x;
} }
@ -76,15 +74,12 @@ ieee754sp ieee754sp_abs(ieee754sp x)
CLEARCX; CLEARCX;
FLUSHXSP; FLUSHXSP;
/* Clear sign ALWAYS, irrespective of NaN */
SPSIGN(x) = 0;
if (xc == IEEE754_CLASS_SNAN) { if (xc == IEEE754_CLASS_SNAN) {
SETCX(IEEE754_INVALID_OPERATION);
return ieee754sp_nanxcpt(ieee754sp_indef(), "abs"); return ieee754sp_nanxcpt(ieee754sp_indef(), "abs");
} }
if (ieee754sp_isnan(x)) /* but not infinity */
return ieee754sp_nanxcpt(x, "abs", x);
/* quick fix up */
SPSIGN(x) = 0;
return x; return x;
} }