Re: inline-asm/10396: Constraint alternatives cause error " `asm' operand requires impossible reload"

Re: inline-asm/10396: Constraint alternatives cause error " `asm' operand requires impossible reload"

[steven]

Synopsis: Constraint alternatives cause error " `asm' operand requires impossible reload"

State-Changed-From-To: feedback->analyzed
State-Changed-By: steven
State-Changed-When: Tue May 13 06:29:34 2003
State-Changed-Why:
    Confirmed vs. 3.3

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10396

Re: inline-asm/10396: Constraint alternatives cause error " `asm' operand requires impossible reload"

[Pete Gonzalez]

The following reply was made to PR inline-asm/10396; it has been noted by GNATS.

From: Pete Gonzalez <gonz@ratloop.com>
To: gcc-gnats@gcc.gnu.org,gcc-bugs@gcc.gnu.org,nobody@gcc.gnu.org,
 gcc-prs@gcc.gnu.org,gonz@ratloop.com
Cc:  
Subject: Re: inline-asm/10396: Constraint alternatives cause error "
  `asm' operand requires impossible reload"
Date: Mon, 05 May 2003 21:05:56 -0400

 I tried the example again with the GCC 3.3 prerelease (20030428),
 but the "impossible reload" error is still being generated.
 
 For reference, here is the section from gcc/reload1.c which produces
 the error message:
 
 	      /* Substitute the chosen reload regs from reload_reg_rtx
 		 into the insn's body (or perhaps into the bodies of other
 		 load and store insn that we just made for reloading
 		 and that we moved the structure into).  */
 	      subst_reloads (insn);
 
 	      /* If this was an ASM, make sure that all the reload insns
 		 we have generated are valid.  If not, give an error
 		 and delete them.  */
 
 	      if (asm_noperands (PATTERN (insn)) >= 0)
 		for (p = NEXT_INSN (prev); p != next; p = NEXT_INSN (p))
 		  if (p != insn && INSN_P (p)
 		      && GET_CODE (PATTERN (p)) != USE
 		      && (recog_memoized (p) < 0
 			  || (extract_insn (p), ! constrain_operands (1))))
 		    {
 		      error_for_asm (insn,
 				     "`asm' operand requires impossible reload");
 		      delete_insn (p);
 		    }
 
 Once again, each of the constraint alternatives works fine by itself;
 it is only the combination of three alternatives that introduces the
 error.
 

Re: inline-asm/10396: Constraint alternatives cause error " `asm' operand requires impossible reload"

[Pete Gonzalez]

The following reply was made to PR inline-asm/10396; it has been noted by GNATS.

From: Pete Gonzalez <gonz@ratloop.com>
To: gcc-gnats@gcc.gnu.org,gcc-bugs@gcc.gnu.org,nobody@gcc.gnu.org,
 gcc-prs@gcc.gnu.org
Cc:  
Subject: Re: inline-asm/10396: Constraint alternatives cause error "
  `asm' operand requires impossible reload"
Date: Sun, 27 Apr 2003 23:56:05 -0400

 >Do you have this problem with 3.3 as well?  Many reload and
 >inline-asm problems have been fixed for 3.3, maybe your problem
 >is fixed there as well.
 
 I attempted to recompile using the latest 3.3 snapshot (20030421),
 however the build fails with this error:
 
 >gcc   -g -O2 -DIN_GCC -DCROSS_COMPILE  -W -Wall -Wwrite-strings 
 >-Wstrict-prototypes -Wmissing-prototypes -Wtraditional -pedantic 
 >-Wno-long-long   -DHAVE_CONFIG_H -DGENERATOR_FILE  -o gengtype.exe \
 >  gengtype.o gengtype-lex.o gengtype-yacc.o ../libiberty/libiberty.a
 >./gengtype
 >Signal 11
 >make[2]: *** [s-gtype] Error 139
 >make[2]: Leaving directory 
 >`/home/Administrator/DevKitAdv-Source/build-gcc/gcc'
 >make[1]: *** [all-gcc] Error 2
 >make[1]: Leaving directory `/home/Administrator/DevKitAdv-Source/build-gcc'
 >make: *** [stmp-gcc-make-all] Error 2
 
 I guess I should wait for a more stable version of the source code.
 How far off is the official 3.3 release?
 
 Thanks,
 -Pete