]> git.baikalelectronics.ru Git - kernel.git/commit
MIPS: math-emu: MINA.<D|S>: Fix some cases of infinity and zero inputs
authorAleksandar Markovic <aleksandar.markovic@imgtec.com>
Thu, 27 Jul 2017 16:08:53 +0000 (18:08 +0200)
committerRalf Baechle <ralf@linux-mips.org>
Tue, 29 Aug 2017 13:21:55 +0000 (15:21 +0200)
commit08dafbbada21a7c1add62bed386034054cff7e42
tree444419f457499e02f5c9d69a2bdff95cda25ee3f
parenta5e8054c6258f0f0a4b84c92ca2756cc95c5a941
MIPS: math-emu: MINA.<D|S>: Fix some cases of infinity and zero inputs

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: 0a43e2f197c2 ("MIPS: math-emu: Add support for the MIPS R6 MAX{, A} FPU instruction")
Fixes: 21e7bac9f7f9 ("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>
arch/mips/math-emu/dp_fmin.c
arch/mips/math-emu/sp_fmin.c