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Re: [PATCH] Remove alpha specific fmax, fmin to fix sNaN handling [BZ #20947]

From: "Maciej W. Rozycki" <macro at mips dot com>
To: Adhemerval Zanella <adhemerval dot zanella at linaro dot org>
Cc: Joseph Myers <joseph at codesourcery dot com>, Aurelien Jarno <aurelien at aurel32 dot net>, <libc-alpha at sourceware dot org>
Date: Thu, 4 Jan 2018 08:43:04 +0000
Subject: Re: [PATCH] Remove alpha specific fmax, fmin to fix sNaN handling [BZ #20947]
Authentication-results: sourceware.org; auth=none
References: <20171231163825.9768-1-aurelien@aurel32.net> <7f8e7304-a9b0-9925-62bd-b916a10a4a98@linaro.org> <20180101150041.GB4216@aurel32.net> <alpine.DEB.2.20.1801011505090.394@digraph.polyomino.org.uk> <d6e4d4d7-0eee-7e9b-5c1f-0c0a38df8014@linaro.org> <alpine.DEB.2.20.1801012141490.8572@digraph.polyomino.org.uk> <6b96e5ad-0b25-0f06-1819-cdcd159b7ff9@linaro.org> <alpine.DEB.2.20.1801021334420.31247@digraph.polyomino.org.uk> <2ce76bce-b789-05aa-daaf-78f5edea7c47@linaro.org>

On Tue, 2 Jan 2018, Adhemerval Zanella wrote:

> It is the 'cvttq/svm' which changes the fpcr and sets INE bit.
> 
> (gdb) i r fpcr
> fpcr           0x680e000000000000       7497930429618454528
> (gdb) ni
> 0x000002000009a194      38            __asm (
> (gdb) i r fpcr
> fpcr           0xe90e000000200000       -1653384013196296192
> 
> (0x000002000009a194 is the cvttq/svm from s_ceil.S).

 FYI, you can use `x /i $pc' and also `display /i $pc' to have the current 
machine instruction disassembled in GDB.

  Maciej

References:
- Re: [PATCH] Remove alpha specific fmax, fmin to fix sNaN handling [BZ #20947]
  - From: Aurelien Jarno
- Re: [PATCH] Remove alpha specific fmax, fmin to fix sNaN handling [BZ #20947]
  - From: Joseph Myers
- Re: [PATCH] Remove alpha specific fmax, fmin to fix sNaN handling [BZ #20947]
  - From: Adhemerval Zanella
- Re: [PATCH] Remove alpha specific fmax, fmin to fix sNaN handling [BZ #20947]
  - From: Joseph Myers
- Re: [PATCH] Remove alpha specific fmax, fmin to fix sNaN handling [BZ #20947]
  - From: Adhemerval Zanella
- Re: [PATCH] Remove alpha specific fmax, fmin to fix sNaN handling [BZ #20947]
  - From: Joseph Myers
- Re: [PATCH] Remove alpha specific fmax, fmin to fix sNaN handling [BZ #20947]
  - From: Adhemerval Zanella

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