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Re: [Qemu-devel] [PATCH 4/8] ARM: Return correct result for float-to-int
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From: |
Nathan Froyd |
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Subject: |
Re: [Qemu-devel] [PATCH 4/8] ARM: Return correct result for float-to-integer conversion of NaN |
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Date: |
Thu, 11 Nov 2010 14:21:06 -0500 |
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User-agent: |
Mutt/1.5.20 (2009-06-14) |
On Thu, Nov 11, 2010 at 06:23:58PM +0000, Peter Maydell wrote:
> The ARM architecture mandates that converting a NaN value to
> integer gives zero. This isn't the behaviour of the SoftFloat
> library, so NaNs must be special-cased.
This is correct, but it's really only correct if FP traps are disabled.
(Also, the arm routines returning float* values is just awful. Not your
fault, just a comment.)
-Nathan
- [Qemu-devel] [PATCH 0/8] ARM: fix VCVT instructions, Peter Maydell, 2010/11/11
- [Qemu-devel] [PATCH 1/8] ARM: Fix decoding of VFP forms of VCVT between float and int/fixed, Peter Maydell, 2010/11/11
- [Qemu-devel] [PATCH 6/8] ARM: Ignore top 16 bits when doing VCVT from 16 bit fixed point, Peter Maydell, 2010/11/11
- [Qemu-devel] [PATCH 7/8] softfloat: Add float/double to 16 bit integer conversion functions, Peter Maydell, 2010/11/11
- [Qemu-devel] [PATCH 2/8] ARM: Fix decoding of Neon forms of VCVT between float and fixed point, Peter Maydell, 2010/11/11
- [Qemu-devel] [PATCH 4/8] ARM: Return correct result for float-to-integer conversion of NaN, Peter Maydell, 2010/11/11
- Re: [Qemu-devel] [PATCH 4/8] ARM: Return correct result for float-to-integer conversion of NaN,
Nathan Froyd <=
- [Qemu-devel] [PATCH 5/8] ARM: Return correct result for single<->double conversion of NaN, Peter Maydell, 2010/11/11
- [Qemu-devel] [PATCH 3/8] ARM: Fix sense of to_integer bit in Neon VCVT float/int conversion, Peter Maydell, 2010/11/11
- [Qemu-devel] [PATCH 8/8] ARM: Implement VCVT to 16 bit integer using new softfloat routines, Peter Maydell, 2010/11/11