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Re: [PATCH for-4.20] hvmloader: Use fastcall everywhere
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 17 Jul 2024 14:09:35 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 17 Jul 2024 12:09:53 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 17.07.2024 13:18, Andrew Cooper wrote:
> HVMLoader is a single freestanding 32bit program with no external
> dependencies. Use the fastcall calling convetion (up to 3 parameters in
> registers rather than on the stack) globally, which is more efficient because
> of reducing the number of stack operations.
>
> Some bloat-o-meter highligs are:
>
> add/remove: 0/0 grow/shrink: 3/118 up/down: 8/-3004 (-2996)
> Function old new delta
> ...
> hvmloader_acpi_build_tables 1125 961 -164
> acpi_build_tables 1277 1081 -196
> pci_setup 4756 4516 -240
> construct_secondary_tables 1689 1447 -242
>
> No functional change.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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