Hi Christophe -- we think that commit bd49e6027cbc207c, now in master,
should have fixed this bug. Could you retry your testcase with a QEMU
build including that fix?

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  ARM/Neon: vcvt rounding error

Status in QEMU:

Bug description:

  While using QEMU commit 47d3b60858d90ac8a0cc3a72af7f95c96781125a
  (March 28, 2018), I've noticed failures in one of the GCC ARM/Neon
  tests. The test passes on hardware, and with QEMU-2.11.0, so it looks
  like a recent regression.

  The test builds a vector of 4 float32 with "125.9" as value, then converts 
them to 4 uint32_t.
  The expected result is 125, but we get 126 instead.

  Maybe it's just a matter of default rounding mode?

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