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Re: [PATCH, ARM] Tweak gcc.c-torture/execute/20101011-1.c to test division-by-zero trapping on ARM
- From: Julian Brown <julian at codesourcery dot com>
- To: Richard Earnshaw <rearnsha at arm dot com>
- Cc: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>, "ramana dot radhakrishnan at linaro dot org" <ramana dot radhakrishnan at linaro dot org>
- Date: Fri, 20 Jul 2012 17:52:04 +0100
- Subject: Re: [PATCH, ARM] Tweak gcc.c-torture/execute/20101011-1.c to test division-by-zero trapping on ARM
- References: <20120720113552.5b452950@octopus> <email@example.com>
On Fri, 20 Jul 2012 17:24:36 +0100
Richard Earnshaw <firstname.lastname@example.org> wrote:
> On 20/07/12 11:35, Julian Brown wrote:
> > Hi,
> > On several architectures, the test
> > gcc.c-torture/execute/20101011-1.c tests the raising of a signal
> > when a division by zero occurs, but at present the test is simply
> > skipped on ARM. We can make the test slightly more useful by using
> > the EABI-provided ability to define a division-by-zero handling
> > function which raises SIGFPE -- thus mimicking the behaviour of
> > other targets, and allowing us to run the test as intended.
> > If the target has hardware integer division instructions, the test
> > is still skipped.
> > The new test passes for a bare-metal config. OK to apply?
> Which permutations (CPU, ARM, Thumb) did you test?
On mainline, merely the defaults for an arm-none-eabi toolchain, i.e.
armv4t, -marm and -mthumb. On our internal branches (where a version
of the patch has been present for some time), a much wider set of CPUs,
including Cortex-M's and so forth with hardware multiplication
(The list is approximately: ARMv4 ARM & Thumb, ARMv5te ARM mode with &
without VFP, various ARMv7-A configs including ARM & Thumb-2 mode,
Cortex-M3 & VFP-enabled Cortex-M4.)