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* [Bug target/108958] New: Powerpcle could generate mtvsrdd for zero extend DI to TI mode, when the TImode is in a vector register
@ 2023-02-27 22:28 meissner at gcc dot gnu.org
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From: meissner at gcc dot gnu.org @ 2023-02-27 22:28 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108958
Bug ID: 108958
Summary: Powerpcle could generate mtvsrdd for zero extend DI to
TI mode, when the TImode is in a vector register
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: meissner at gcc dot gnu.org
Target Milestone: ---
If you have a DImode variable (i.e. long) in a GPR, and you want to zero extend
it to TImode (i.e. `__int128', and the result is needed in a vector register,
you could just do a single `mtvsrdd' instruction, instead of separate zero a
GPR register, and then `mtvsrd' and `mtvsrdd' instructions.
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2023-02-27 22:28 [Bug target/108958] New: Powerpcle could generate mtvsrdd for zero extend DI to TI mode, when the TImode is in a vector register meissner at gcc dot gnu.org
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