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* [Bug middle-end/21223] Output register variable is reloaded into the wrong register for asm
[not found] <bug-21223-4@http.gcc.gnu.org/bugzilla/>
@ 2021-08-08 21:25 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-08-08 21:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=21223
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=87600,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=86939,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=87899
Known to fail| |4.9.0, 8.1.0
Target Milestone|--- |9.0
Status|NEW |RESOLVED
Known to work| |9.1.0
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So this is fully fixed in GCC 9+. LRA fixes the problems that reload had. (LRA
had a similar bug but had been fixes see the linked bug reports).
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug middle-end/21223] Output register variable is reloaded into the wrong register for asm
2005-04-25 20:49 [Bug rtl-optimization/21223] New: " drow at gcc dot gnu dot org
2005-04-25 21:10 ` [Bug middle-end/21223] " pinskia at gcc dot gnu dot org
@ 2005-04-25 21:13 ` drow at gcc dot gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: drow at gcc dot gnu dot org @ 2005-04-25 21:13 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From drow at gcc dot gnu dot org 2005-04-25 21:12 -------
The problem is in reg_is_set or its caller.
Because the output is an earlyclobber operand, it needs to be marked as born
before the insn, to conflict with its inputs. I do not see an obvious way to
get from note_stores to the recog alternative.
I reproduced this bug in 3.4.3 (csl-arm-branch) also.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21223
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug middle-end/21223] Output register variable is reloaded into the wrong register for asm
2005-04-25 20:49 [Bug rtl-optimization/21223] New: " drow at gcc dot gnu dot org
@ 2005-04-25 21:10 ` pinskia at gcc dot gnu dot org
2005-04-25 21:13 ` drow at gcc dot gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-04-25 21:10 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-04-25 21:09 -------
And here is an x86 testcase:
int bar(int *mem)
{
return ({ register int a_oldval asm ("eax");
register int a_tmp asm ("ebx");
int a_oldval2 = 3;
__asm__ __volatile__ ("# Should be eax - %0\n\t"
"# Should be ebx - %1\n\t"
"# unknown - %2"
: "=&r" (a_oldval), "=&r" (a_tmp)
: "r" (a_oldval2));
a_tmp; });
}
Which shows this fails at -O2 and above too.
--
What |Removed |Added
----------------------------------------------------------------------------
Component|rtl-optimization |middle-end
GCC target triplet|arm-none-linux-gnueabi, |
|powerpc-darwin |
Known to fail|3.3.3 4.1.0 |3.3.3 4.1.0 2.95.3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21223
^ permalink raw reply [flat|nested] 3+ messages in thread
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[not found] <bug-21223-4@http.gcc.gnu.org/bugzilla/>
2021-08-08 21:25 ` [Bug middle-end/21223] Output register variable is reloaded into the wrong register for asm pinskia at gcc dot gnu.org
2005-04-25 20:49 [Bug rtl-optimization/21223] New: " drow at gcc dot gnu dot org
2005-04-25 21:10 ` [Bug middle-end/21223] " pinskia at gcc dot gnu dot org
2005-04-25 21:13 ` drow at gcc dot gnu dot org
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