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Re: A doubt about constraint modifiers

From: Bernd Schmidt <bernds_cb1 at t-online dot de>
To: Mohamed Shafi <shafitvm at gmail dot com>
Cc: Ian Lance Taylor <iant at google dot com>, gcc at gcc dot gnu dot org
Date: Fri, 11 Apr 2008 15:32:02 +0200
Subject: Re: A doubt about constraint modifiers
References: <ba0bd44d0804102258n3c2ccae7v8a0f9a28b253893e@mail.gmail.com> <m3y77kn9vl.fsf@google.com> <ba0bd44d0804110029p7d1cf727u9b0bba9f675b1a7b@mail.gmail.com>

Mohamed Shafi wrote:

In cris i saw this patten

(define_insn "*andhi_lowpart"
  [(set (strict_low_part
	 (match_operand:HI 0 "register_operand"	       "=r,r, r,r,r,r"))
	(and:HI (match_operand:HI 1 "register_operand" "%0,0, 0,0,0,r")
		(match_operand:HI 2 "general_operand"   "r,Q>,L,O,g,!To")))]

Here = is used.

This is incorrect since when the last alternative matches, nothing tells the compiler that operand 0 is also an input.


Bernd
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Follow-Ups:
- Committed: fix cris.md strict_low_part constraints (was: Re: A doubt about constraint modifiers)
  - From: Hans-Peter Nilsson

References:
- A doubt about constraint modifiers
  - From: Mohamed Shafi
- Re: A doubt about constraint modifiers
  - From: Ian Lance Taylor
- Re: A doubt about constraint modifiers
  - From: Mohamed Shafi

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