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softfloat: implement fused multiply-add NaN propagation for MIPS 

Add a pickNaNMulAdd function for MIPS, implementing NaN propagation
rules for MIPS fused multiply-add instructions.

Cc: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2012-10-09 21:53:20 +02:00
parent 1e0e239a89
commit bbc1dedef6
1 changed files with 27 additions and 0 deletions
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27
fpu/softfloat-specialize.h
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@ -486,6 +486,33 @@ static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
return 1;
}
}
#elif defined(TARGET_MIPS)
static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
flag cIsQNaN, flag cIsSNaN, flag infzero STATUS_PARAM)
{
/* For MIPS, the (inf,zero,qnan) case sets InvalidOp and returns
* the default NaN
*/
if (infzero) {
float_raise(float_flag_invalid STATUS_VAR);
return 3;
}
/* Prefer sNaN over qNaN, in the a, b, c order. */
if (aIsSNaN) {
return 0;
} else if (bIsSNaN) {
return 1;
} else if (cIsSNaN) {
return 2;
} else if (aIsQNaN) {
return 0;
} else if (bIsQNaN) {
return 1;
} else {
return 2;
}
}
#elif defined(TARGET_PPC)
static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
flag cIsQNaN, flag cIsSNaN, flag infzero STATUS_PARAM)