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MIPS: math-emu: Update sNaN quieting handlers

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Commit fdffbafb [Lots of FPU bug fixes from Kjeld Borch Egevang.]
replaced the two single `ieee754sp_nanxcpt' and `ieee754dp_nanxcpt'
places, where sNaN quieting used to happen for single and double
floating-point operations respectively, with individual qNaN
instantiations across all the call sites instead.  It also made most of
these two functions dead code as where called on a qNaN they return
right away.

To revert the damage and make sNaN quieting uniform again first rewrite
`ieee754sp_nanxcpt' and `ieee754dp_nanxcpt' to do the same quieting all
the call sites do, that is return the default qNaN encoding for all
input sNaN values; never propagate any sNaN payload bits from its
trailing significand field.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9685/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Maciej W. Rozycki 2015-04-03 23:25:18 +01:00 committed by Ralf Baechle
parent 1f6d2c29b0
commit ec98f9a01f
2 changed files with 6 additions and 16 deletions
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11
arch/mips/math-emu/ieee754dp.c
View File

@ -49,14 +49,9 @@ union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp r)
if (!ieee754dp_issnan(r)) /* QNAN does not cause invalid op !! */
return r;
if (!ieee754_setandtestcx(IEEE754_INVALID_OPERATION)) {
/* not enabled convert to a quiet NaN */
DPMANT(r) &= (~DP_MBIT(DP_FBITS-1));
if (ieee754dp_isnan(r))
return r;
else
return ieee754dp_indef();
}
/* If not enabled convert to a quiet NaN. */
if (!ieee754_setandtestcx(IEEE754_INVALID_OPERATION))
return ieee754dp_indef();
return r;
}

11
arch/mips/math-emu/ieee754sp.c
View File

@ -49,14 +49,9 @@ union ieee754sp __cold ieee754sp_nanxcpt(union ieee754sp r)
if (!ieee754sp_issnan(r)) /* QNAN does not cause invalid op !! */
return r;
if (!ieee754_setandtestcx(IEEE754_INVALID_OPERATION)) {
/* not enabled convert to a quiet NaN */
SPMANT(r) &= (~SP_MBIT(SP_FBITS-1));
if (ieee754sp_isnan(r))
return r;
else
return ieee754sp_indef();
}
/* If not enabled convert to a quiet NaN. */
if (!ieee754_setandtestcx(IEEE754_INVALID_OPERATION))
return ieee754sp_indef();
return r;
}