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RE: postreload problem using reload_inm and SECONDARY_RELOAD macros

From: BELBACHIR Selim <selim dot belbachir at fr dot thalesgroup dot com>
To: "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
Date: Thu, 15 Sep 2011 09:50:52 +0200
Subject: RE: postreload problem using reload_inm and SECONDARY_RELOAD macros
References: <19216_1316005778_4E70A792_19216_419_1_9C88BF562A27AA41B242B2780441926E207711FE87@THSONEA01CMS05P.one.grp> <mcr39fzcke2.fsf@coign.corp.google.com> <13001_1316008937_4E70B3E9_13001_13069_1_9C88BF562A27AA41B242B2780441926E207712005C@THSONEA01CMS05P.one.grp> <mcrty8fb3qn.fsf@coign.corp.google.com>

further hints :

The immediate which gcc wants to move in R_REGS is a (const_int 8) as described in the error message below :

	arithmetic.c:197: error: insn does not satisfy its constraints:
	(insn 1505 903 1506 0 (set (reg:SI 25 $R9)
	        (const_int 8 [0x8])) 0 {movsi_internal} (nil)
	    (nil))
	arithmetic.c:197: internal compiler error: in reload_cse_simplify_operands, at postreload.c:391


So I added some debug trace in function 'my_secondary_input_reload_class' to understand why (const_int 8) is not reloaded to C_REGS.

'my_secondary_input_reload_class' is called several times but never with rtl expression (const_int 8).

I also checked 'my_preferred_reload_class' function and I don't see expression (const_int 8).

	Selim

References:
- postreload problem using reload_inm and SECONDARY_RELOAD macros
  - From: BELBACHIR Selim
- Re: postreload problem using reload_inm and SECONDARY_RELOAD macros
  - From: Ian Lance Taylor

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