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[Qemu-commits] [qemu/qemu] ce8d40: fpu: Bound increment for scalbn

From: GitHub
Subject: [Qemu-commits] [qemu/qemu] ce8d40: fpu: Bound increment for scalbn
Date: Tue, 17 Apr 2018 06:52:54 -0700

  Branch: refs/heads/master
  Home:   https://github.com/qemu/qemu
  Commit: ce8d4082054519f2eaac39958edde502860a7fc6
  Author: Richard Henderson <address@hidden>
  Date:   2018-04-17 (Tue, 17 Apr 2018)

  Changed paths:
    M fpu/softfloat.c

  Log Message:
  fpu: Bound increment for scalbn

Without bounding the increment, we can overflow exp either here
in scalbn_decomposed or when adding the bias in round_canonical.
This can result in e.g. underflowing to 0 instead of overflowing
to infinity.

The old softfloat code did bound the increment.

Signed-off-by: Richard Henderson <address@hidden>
Reviewed-by: Peter Maydell <address@hidden>
Reviewed-by: Alex Bennée <address@hidden>
Tested-by: Alex Bennée <address@hidden>
Signed-off-by: Peter Maydell <address@hidden>

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