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Re: Implement fma in soft-fp

From: Richard Henderson <rth at twiddle dot net>
To: "Joseph S. Myers" <joseph at codesourcery dot com>
Cc: libc-alpha at sourceware dot org, libc-ports at sourceware dot org, Marcus Shawcroft <marcus dot shawcroft at linaro dot org>, Richard Henderson <rth at redhat dot com>, David Holsgrove <david dot holsgrove at xilinx dot com>, Chris Metcalf <cmetcalf at tilera dot com>, "David S. Miller" <davem at davemloft dot net>
Date: Tue, 25 Jun 2013 09:31:49 -0700
Subject: Re: Implement fma in soft-fp
References: <Pine dot LNX dot 4 dot 64 dot 1306221707230 dot 15367 at digraph dot polyomino dot org dot uk>

With the following patch, I get

> testing long double (without inline functions)
> Failure: fma (0x1.fffffffffffffffffffffffffffcp-16382, 0x1.0000000000000000000000000001p-1, 0x1p-16494): Exception "Underflow" set
> Failure: fma (-0x1.fffffffffffffffffffffffffffcp-16382, 0x1.0000000000000000000000000001p-1, -0x1p-16494): Exception "Underflow" set
> Failure: fma (0x1p-16494, -0x1p-16494, 0x1p-16382): Exception "Underflow" set
> Failure: fma (0x1p-16494, 0x1p-16494, -0x1p-16382): Exception "Underflow" set
> Failure: fma_downward (-0x1.fffffffffffffffffffffffffffcp-16382, 0x1.0000000000000000000000000001p-1, -0x1p-16494): Exception "Underflow" set
> Failure: fma_downward (-0x1p-16494, 0x1.1p-1, -0x0.ffffffffffffffffffffffffffffp-16382): Exception "Underflow" set
> Failure: fma_downward (0x1p-16494, 0x1p-16494, -0x1p-16382): Exception "Underflow" set
> Failure: fma_upward (0x1.fffffffffffffffffffffffffffcp-16382, 0x1.0000000000000000000000000001p-1, 0x1p-16494): Exception "Underflow" set
> Failure: fma_upward (0x1p-16494, 0x1.1p-1, 0x0.ffffffffffffffffffffffffffffp-16382): Exception "Underflow" set
> Failure: fma_upward (0x1p-16494, -0x1p-16494, 0x1p-16382): Exception "Underflow" set

but I thought you'd already committed the patch to solve this
as commit 695c378f81263640618bdebf56eaa065f578251f ?


r~

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  - From: Joseph S. Myers

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