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Fix following special cases for MINA>.<D|S>:
- if one of the inputs is zero, and the other is subnormal, normal,
or infinity, the value of the former should be returned (that is,
a zero).
- if one of the inputs is infinity, and the other input is normal,
or subnormal, the value of the latter should be returned.
The previous implementation's logic for such cases was incorrect - it
appears as if it implements MAXA, and not MINA instruction.
A relevant example:
MINA.S fd,fs,ft:
If fs contains 100.0, and ft contains 0.0, fd is going to contain
0.0 (without this patch, it used to contain 100.0).
Fixes: a79f5f9ba5 ("MIPS: math-emu: Add support for the MIPS R6 MAX{, A} FPU instruction")
Fixes: 4e9561b20e ("MIPS: math-emu: Add support for the MIPS R6 MIN{, A} FPU instruction")
Signed-off-by: Miodrag Dinic <miodrag.dinic@imgtec.com>
Signed-off-by: Goran Ferenc <goran.ferenc@imgtec.com>
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Cc: Bo Hu <bohu@google.com>
Cc: Douglas Leung <douglas.leung@imgtec.com>
Cc: Jin Qian <jinqian@google.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Petar Jovanovic <petar.jovanovic@imgtec.com>
Cc: Raghu Gandham <raghu.gandham@imgtec.com>
Cc: <stable@vger.kernel.org> # 4.3+
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16885/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
304bfe473e