On Tue, Sep 23, 2014 at 6:49 PM, Richard Biener
wrote:
>
> I suppose doing "m" (*params_ptr) would also work.
>
> Richard.
This one works! Thank you.
Regards,
Bin
On Tue, Sep 23, 2014 at 6:41 PM, Andrew Haley wrote:
>
> And neither are they used by the asm; so you have no right to expect %edx
> to contain anything, and neither have you the right to touch it.
>
> Do this:
>
> asm volatile (
> "pushl %1;"
> "call *%%eax;"
> "add
On Tue, Sep 23, 2014 at 12:41 PM, Andrew Haley wrote:
> On 09/23/2014 10:39 AM, Bin Meng wrote:
>> On Tue, Sep 23, 2014 at 5:11 PM, Bin Meng wrote:
>>>
>>> Sorry I still don't get it. The inline-asm codes are put in the very end
>>> of the test function just before return, so the clobbered regist
On Tue, Sep 23, 2014 at 11:39 AM, Bin Meng wrote:
> On Tue, Sep 23, 2014 at 5:11 PM, Bin Meng wrote:
>>
>> Sorry I still don't get it. The inline-asm codes are put in the very end
>> of the test function just before return, so the clobbered registers are
>> not used by gcc. The %edx gets overwrit
On 09/23/2014 10:39 AM, Bin Meng wrote:
> On Tue, Sep 23, 2014 at 5:11 PM, Bin Meng wrote:
>>
>> Sorry I still don't get it. The inline-asm codes are put in the very end
>> of the test function just before return, so the clobbered registers are
>> not used by gcc.
And neither are they used by the
On Tue, Sep 23, 2014 at 5:11 PM, Bin Meng wrote:
>
> Sorry I still don't get it. The inline-asm codes are put in the very end
> of the test function just before return, so the clobbered registers are
> not used by gcc. The %edx gets overwritten before the inline-asm block.
>
> I just did a modific
On Tue, Sep 23, 2014 at 4:32 PM, Jakub Jelinek wrote:
> You are doing a call in the inline-asm behind compiler's back, and
> some registers are call clobbered in the ABI. So, unless you call a very
> special function written in assembly that doesn't clobber those registers
> (basically, uses a cu
On Tue, Sep 23, 2014 at 04:20:16PM +0800, Bin Meng wrote:
> Hi Richard,
>
> On Tue, Sep 23, 2014 at 4:09 PM, Richard Biener
> wrote:
> > Your asm constraints do not specify that they use %edx.
> >
> > Richard.
> >
>
> Sorry, I don't understand. The %edx is not used by the inline assembly codes.
Hi Richard,
On Tue, Sep 23, 2014 at 4:09 PM, Richard Biener
wrote:
> Your asm constraints do not specify that they use %edx.
>
> Richard.
>
Sorry, I don't understand. The %edx is not used by the inline assembly codes.
The 'mov(%eax),%edx' corresponds to C code:
pcall = (PCALL)(r->a + r->b);
On Tue, Sep 23, 2014 at 9:51 AM, Bin Meng wrote:
> Hi,
>
> I get a piece of code to be compiled by gcc with the combined '-Os
> -mregparm=3' options to generate the x86 32-bit codes, and I found gcc
> created broken codes.
>
> The test codes that can be used to trigger this issue: (save the
> foll
Hi,
I get a piece of code to be compiled by gcc with the combined '-Os
-mregparm=3' options to generate the x86 32-bit codes, and I found gcc
created broken codes.
The test codes that can be used to trigger this issue: (save the
following to test.c.)
typedef struct {
int a;
int
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