From: Peter Maydell <peter.maydell@linaro.org>
To: Tom Musta <tommusta@gmail.com>
Cc: "qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>,
QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH] target-ppc: Bug: VSX Convert to Integer Should Truncate
Date: Sun, 23 Mar 2014 18:21:29 +0000 [thread overview]
Message-ID: <CAFEAcA8h3DN8Fxf-uCpo3QSXC-CJ3UsEg7ci1ceP6w2sGPTkNg@mail.gmail.com> (raw)
In-Reply-To: <1395597768-3159-1-git-send-email-tommusta@gmail.com>
On 23 March 2014 18:02, Tom Musta <tommusta@gmail.com> wrote:
> diff --git a/target-ppc/fpu_helper.c b/target-ppc/fpu_helper.c
> index e7f3295..ccfc5cc 100644
> --- a/target-ppc/fpu_helper.c
> +++ b/target-ppc/fpu_helper.c
> @@ -2558,10 +2558,14 @@ void helper_##op(CPUPPCState *env, uint32_t opcode) \
> fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXCVI, 0); \
> xt.tfld = rnan; \
> } else { \
> + /* force round to zero mode (truncation) */ \
> + set_float_rounding_mode(float_round_to_zero, &env->fp_status); \
> xt.tfld = stp##_to_##ttp(xb.sfld, &env->fp_status); \
> if (env->fp_status.float_exception_flags & float_flag_invalid) { \
> fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXCVI, 0); \
> } \
If we raise a CPU exception here (via helper_raise_exception_err())
we'll longjmp out of here and never restore the rounding mode. So
the restoring of the rounding mode needs to happen before we
check for exceptions here.
> + /* restore rounding mode from FPSCR */ \
> + fpscr_set_rounding_mode(env); \
> } \
> } \
> \
thanks
-- PMM
next prev parent reply other threads:[~2014-03-23 18:22 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-23 18:02 [Qemu-devel] [PATCH] target-ppc: Bug: VSX Convert to Integer Should Truncate Tom Musta
2014-03-23 18:21 ` Peter Maydell [this message]
2014-03-23 21:52 ` [Qemu-devel] [V2 PATCH] " Tom Musta
2014-03-25 18:06 ` Peter Maydell
2014-03-25 21:26 ` Tom Musta
2014-03-26 15:05 ` Tom Musta
2014-03-26 16:41 ` Richard Henderson
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