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* [Bug target/102076] New: powerpc: mflr called twice when using __builtin_return_address(0)
@ 2021-08-26 11:38 christophe.leroy at csgroup dot eu
2021-08-26 18:21 ` [Bug target/102076] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: christophe.leroy at csgroup dot eu @ 2021-08-26 11:38 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102076
Bug ID: 102076
Summary: powerpc: mflr called twice when using
__builtin_return_address(0)
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: christophe.leroy at csgroup dot eu
Target Milestone: ---
Fonction:
long f(void *);
long g(void)
{
return 3 + f(__builtin_return_address(0));
}
Builds into:
00000000 <g>:
0: 7c 08 02 a6 mflr r0
4: 7c 68 02 a6 mflr r3
8: 94 21 ff f0 stwu r1,-16(r1)
c: 90 01 00 14 stw r0,20(r1)
10: 48 00 00 01 bl 10 <g+0x10>
14: 80 01 00 14 lwz r0,20(r1)
18: 38 63 00 03 addi r3,r3,3
1c: 7c 08 03 a6 mtlr r0
20: 38 21 00 10 addi r1,r1,16
24: 4e 80 00 20 blr
The 'mflr r0' should be avoided by using the value in r3
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug target/102076] powerpc: mflr called twice when using __builtin_return_address(0)
2021-08-26 11:38 [Bug target/102076] New: powerpc: mflr called twice when using __builtin_return_address(0) christophe.leroy at csgroup dot eu
@ 2021-08-26 18:21 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-08-26 18:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102076
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
Keywords| |missed-optimization
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-08-26 11:38 [Bug target/102076] New: powerpc: mflr called twice when using __builtin_return_address(0) christophe.leroy at csgroup dot eu
2021-08-26 18:21 ` [Bug target/102076] " pinskia at gcc dot gnu.org
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