diff options
| author | Aurelien Jarno <aurelien@aurel32.net> | 2012-10-09 21:53:20 +0200 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2012-10-31 22:20:45 +0100 |
| commit | bbc1dedef6530917e34a94a2641932e636f9b02d (patch) | |
| tree | 8be17671edc3d696d21062637e680868d3cb2dc0 /fpu | |
| parent | 1e0e239a89b5a5ffe475a8efce5e59383a88af44 (diff) | |
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>
Diffstat (limited to 'fpu')
| -rw-r--r-- | fpu/softfloat-specialize.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h index a1d489e425..518f694a68 100644 --- a/fpu/softfloat-specialize.h +++ b/fpu/softfloat-specialize.h @@ -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) |