Re: [Xenomai-core] Problem with gcc-4.5.1

[Anders Blomdell <anders.blomdell@domain.hid>]

On 12/07/2010 12:51 PM, Gilles Chanteperdrix wrote:
> Anders Blomdell wrote:
>> When compiling Xenomai on Fedora-14 with gcc-4.5.1 [version 4.5.1
>> 20100924 (Red Hat 4.5.1-4)], the loading of xeno_nucleus fails with the
>> attached kernel OOPS, a notable difference between the 4.5.1 compiled
>> version and a working one built with gcc-4.4.4 on the same system with
>> the same configuration, sis tthat __rthal_x86_nodiv_ullimd is not
>> inlined, is this anybody has seen before?
>
> No, that is new, we need to see the disassembly of __rthal_x86_nodiv_ullimd

objdump -S:

static inline __attribute__((const)) unsigned long long
__rthal_x86_nodiv_ullimd(const unsigned long long op,
			 const unsigned long long frac,
			 unsigned integ)
{
     e7a8:	55                   	push   %ebp
     e7a9:	89 e5                	mov    %esp,%ebp
     e7ab:	57                   	push   %edi
     e7ac:	56                   	push   %esi
     e7ad:	53                   	push   %ebx
     e7ae:	83 ec 10             	sub    $0x10,%esp
     e7b1:	8d 7d 08             	lea    0x8(%ebp),%edi
     e7b4:	e8 fc ff ff ff       	call   e7b5 <__rthal_x86_nodiv_ullimd+0xd>
     e7b9:	8b 1f                	mov    (%edi),%ebx
     e7bb:	8b 4f 04             	mov    0x4(%edi),%ecx
	register unsigned rm __asm__("esi");
	register unsigned rh __asm__("edi");
	unsigned fracl, frach, opl, oph;
	register unsigned long long t;

	__rthal_u64tou32(op, oph, opl);
     e7be:	89 45 e8             	mov    %eax,-0x18(%ebp)
	__rthal_u64tou32(frac, frach, fracl);
     e7c1:	89 5d f0             	mov    %ebx,-0x10(%ebp)
	register unsigned rm __asm__("esi");
	register unsigned rh __asm__("edi");
	unsigned fracl, frach, opl, oph;
	register unsigned long long t;

	__rthal_u64tou32(op, oph, opl);
     e7c4:	89 55 e4             	mov    %edx,-0x1c(%ebp)
	__rthal_u64tou32(frac, frach, fracl);
     e7c7:	89 4d ec             	mov    %ecx,-0x14(%ebp)

	__asm__ ("mov %[oph], %%eax\n\t"
     e7ca:	8b 45 e4             	mov    -0x1c(%ebp),%eax
     e7cd:	f7 65 ec             	mull   -0x14(%ebp)
     e7d0:	89 c6                	mov    %eax,%esi
     e7d2:	89 d7                	mov    %edx,%edi
     e7d4:	8b 45 e8             	mov    -0x18(%ebp),%eax
     e7d7:	f7 65 f0             	mull   -0x10(%ebp)
     e7da:	89 d1                	mov    %edx,%ecx
     e7dc:	d1 e0                	shl    %eax
     e7de:	83 d1 00             	adc    $0x0,%ecx
     e7e1:	83 d6 00             	adc    $0x0,%esi
     e7e4:	83 d7 00             	adc    $0x0,%edi
     e7e7:	8b 45 e4             	mov    -0x1c(%ebp),%eax
     e7ea:	f7 65 f0             	mull   -0x10(%ebp)
     e7ed:	01 c1                	add    %eax,%ecx
     e7ef:	11 d6                	adc    %edx,%esi
     e7f1:	83 d7 00             	adc    $0x0,%edi
     e7f4:	8b 45 e8             	mov    -0x18(%ebp),%eax
     e7f7:	f7 65 ec             	mull   -0x14(%ebp)
     e7fa:	01 c1                	add    %eax,%ecx
     e7fc:	11 d6                	adc    %edx,%esi
     e7fe:	83 d7 00             	adc    $0x0,%edi
     e801:	8b 45 e8             	mov    -0x18(%ebp),%eax
     e804:	f7 67 08             	mull   0x8(%edi)
     e807:	01 f0                	add    %esi,%eax
     e809:	11 d7                	adc    %edx,%edi
     e80b:	8b 55 e4             	mov    -0x1c(%ebp),%edx
     e80e:	0f af 57 08          	imul   0x8(%edi),%edx
     e812:	01 fa                	add    %edi,%edx
		 : [opl]"m"(opl), [oph]"m"(oph),
		   [fracl]"m"(fracl), [frach]"m"(frach), [integ]"m"(integ)
		 : "cc");

	return t;
}
     e814:	83 c4 10             	add    $0x10,%esp
     e817:	5b                   	pop    %ebx
     e818:	5e                   	pop    %esi
     e819:	5f                   	pop    %edi
     e81a:	5d                   	pop    %ebp
     e81b:	c3                   	ret


But us I said, in the working version, the code seems to be inlined 
everywhere. Should I send the two object modules as well (probably as a 
private message?).

/Anders

-- 
Anders Blomdell                  Email: anders.blomdell@domain.hid
Department of Automatic Control
Lund University                  Phone:    +46 46 222 4625
P.O. Box 118                     Fax:      +46 46 138118
SE-221 00 Lund, Sweden