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[Bug 1892081] Re: Performance improvement when using "QEMU_FLATTEN" with
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From: |
Ahmed Karaman |
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Subject: |
[Bug 1892081] Re: Performance improvement when using "QEMU_FLATTEN" with softfloat type conversions |
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Date: |
Tue, 18 Aug 2020 18:37:13 -0000 |
** Attachment added: "before.png"
https://bugs.launchpad.net/qemu/+bug/1892081/+attachment/5402578/+files/before.png
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https://bugs.launchpad.net/bugs/1892081
Title:
Performance improvement when using "QEMU_FLATTEN" with softfloat type
conversions
Status in QEMU:
New
Bug description:
Attached below is a matrix multiplication program for double data
types. The program performs the casting operation "(double)rand()"
when generating random numbers.
This operation calls the integer to float softfloat conversion
function "int32_to_float_64".
Adding the "QEMU_FLATTEN" attribute to the function definition
decreases the instructions per call of the function by about 63%.
Attached are before and after performance screenshots from
KCachegrind.
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