Re: c/233: loop unrolling generates duplicate assmebler labels -> gas rejects code

Re: c/233: loop unrolling generates duplicate assmebler labels -> gas rejects code

[Loren Osborn]

The following reply was made to PR c/233; it has been noted by GNATS.

From: Loren Osborn <linux_dr@yahoo.com>
To: gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org, 
	ingo.oeser@informatik.tu-chemnitz.de, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org
Cc:  
Subject: Re: c/233: loop unrolling generates duplicate assmebler labels ->
	gas rejects code
Date: 24 Aug 2002 15:43:41 -0700

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 I found a similar bug to PR233, and was disappointed to see that PR233 was
 closed, appearantly just because the URL to the test case became a broken link.
 
 I think I have found a manifistaion of the same bug, although it doesn't
 involve unrolling loops.  It involves inlining of functions with
 inline-assembler lables in it...
 
 I have included a minimal test case (I normally would not attach a file when
 there were so many reciepients of an email, but as PR233 was closed because of
 a broken link, I feel it's apropriate)...
 
 to reproduce the error invoke:
   gcc -O3 -c -o InlineLableBug.o InlineLableBug.c
 
 I am using gcc 3.1.1 on Mandrake Linux 8.1...
 
 As far as I am aware, the code itself (while not technically vailid ANSI C,
 because ANSI C doesn't explicitly allow inline assembler) should be valid in
 gcc. 
 
 Please help.
 
 Thanks in advance,
 
 -Loren Osborn
 Software Engineer
 
 
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=233
 
 
 
 
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 static inline void DoNothing()
 {
 	__asm__ (
 			"jmp   leave_fn\n\t"
 			"nop   \n"
 			"leave_fn:\n\t"
 			: // No Input Regs
 			: // No Output Regs
 			);
 }
 
 static void DoNothingOne()
 {
 	DoNothing();
 }
 
 static void DoNothingTwo()
 {
 	DoNothing();
 }
 
 static void DoNothingThree()
 {
 	DoNothing();
 }
 
 typedef void(*CVoidFunc)();
 extern CVoidFunc FuncArray[];
 extern void InitFuncArray();
 #define NULL 0
 
 extern CVoidFunc FuncArray[4];
 void InitFuncArray()
 {
 	FuncArray[0] = DoNothingOne;
 	FuncArray[1] = DoNothingTwo;
 	FuncArray[2] = DoNothingThree;
 	FuncArray[3] = NULL;
 }
 
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