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* [Bug target/96026] New: overlap register bewteen DEST and SOURCE in different machine mode
@ 2020-07-02 7:16 rjiejie at me dot com
2020-07-02 21:34 ` [Bug target/96026] " wilson at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: rjiejie at me dot com @ 2020-07-02 7:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96026
Bug ID: 96026
Summary: overlap register bewteen DEST and SOURCE in different
machine mode
Product: gcc
Version: 9.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: rjiejie at me dot com
Target Milestone: ---
GCC seems to overlap register bewteen DEST and SOURCE in different machine
mode,
e.g. RISCV vector extension:
when VMUL > 1, most of instructions do not support with overlapped register
Is there any target hooks to control this feature ?
We can use <Constraint Modifier> ‘&’ to forbid register allocator to overlap
bewteen DEST and SOURCE,
but there are some redundancy instructions in the result code :(
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug target/96026] overlap register bewteen DEST and SOURCE in different machine mode
2020-07-02 7:16 [Bug target/96026] New: overlap register bewteen DEST and SOURCE in different machine mode rjiejie at me dot com
@ 2020-07-02 21:34 ` wilson at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: wilson at gcc dot gnu.org @ 2020-07-02 21:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96026
Jim Wilson <wilson at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |wilson at gcc dot gnu.org
Resolution|--- |FIXED
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Jim Wilson <wilson at gcc dot gnu.org> ---
This is 3 different places where you have asked the same question now. One
place would have been good enough. Already answered in other places.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-07-02 7:16 [Bug target/96026] New: overlap register bewteen DEST and SOURCE in different machine mode rjiejie at me dot com
2020-07-02 21:34 ` [Bug target/96026] " wilson at gcc dot gnu.org
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