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Re: [Qemu-devel] [PATCH] FMULX should flushes operators to zero when FZ

From: Alex Bennée
Subject: Re: [Qemu-devel] [PATCH] FMULX should flushes operators to zero when FZ is set.
Date: Tue, 03 Feb 2015 13:44:49 +0000

Peter Maydell <address@hidden> writes:

> On 28 January 2015 at 15:57, Peter Maydell <address@hidden> wrote:
>> On 28 January 2015 at 15:54, Alex Bennée <address@hidden> wrote:
>>> Do we have test cases that trip up here? It would be nice to include
>>> them in our testing as the random nature of RISU has obviously failed to
>>> trip up on this instruction.
>> Risu would probably catch this if we generated and ran test cases
>> which set the FPSCR bits to something other than the default.
> This bug is indeed caught by the following risugen:
> ./risugen --numinsns 10000 --pattern "FMULX A64_V" --fpscr 0x01000000
> aarch64.risu FMULX_S3SAME_V_squash.out
> (that fpscr value being "set DZ, nothing else".)
> Alex, I don't suppose your automation of these tests makes
> it easy to do a complete extra run (or better, just of the
> Neon and FP insn tests) with different FPSCR flags?

I just need to add the additional test sequence and trace to the tarball
and the script should pick it up automatically.

> -- PMM

Alex Bennée

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