fpu/softfloat: set invalid excp flag for RISC-V muladd instructions
In IEEE 754-2008 spec: Invalid operation exception is signaled when doing: fusedMultiplyAdd(0, Inf, c) or fusedMultiplyAdd(Inf, 0, c) unless c is a quiet NaN; if c is a quiet NaN then it is implementation defined whether the invalid operation exception is signaled. In RISC-V Unprivileged ISA spec: The fused multiply-add instructions must set the invalid operation exception flag when the multiplicands are Inf and zero, even when the addend is a quiet NaN. This commit set invalid operation execption flag for RISC-V when multiplicands of muladd instructions are Inf and zero. Signed-off-by: Frank Chang <frank.chang@sifive.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20210420013150.21992-1-frank.chang@sifive.com Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
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@ -627,6 +627,12 @@ static int pickNaNMulAdd(FloatClass a_cls, FloatClass b_cls, FloatClass c_cls,
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} else {
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} else {
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return 1;
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return 1;
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}
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}
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#elif defined(TARGET_RISCV)
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/* For RISC-V, InvalidOp is set when multiplicands are Inf and zero */
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if (infzero) {
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float_raise(float_flag_invalid, status);
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}
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return 3; /* default NaN */
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#elif defined(TARGET_XTENSA)
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#elif defined(TARGET_XTENSA)
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/*
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/*
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* For Xtensa, the (inf,zero,nan) case sets InvalidOp and returns
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* For Xtensa, the (inf,zero,nan) case sets InvalidOp and returns
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