On Mon, 3 Jun 2024, Zhao Zhili wrote:
From: Zhao Zhili <zhiliz...@tencent.com>
---
I need help on the test. It succeed with the following patch on ARM64,
but failed with x86. I'm not sure whether the issue is in the test, or
hidden in x86 asm, and I don't know x86 asm.
Note that by default, the output of swscale can differ in rounding from
the reference C code. If the SWS_ACCURATE_RND flag is set, it shouldn't
differ, though.
So it makes sense to test twice, once with SWS_ACCURATE_RND set, doing a
bitexact test of the output, and once without it, allowing the values to
be off by one (or a few?).
See the existing test in checkasm/sw_scale.c for one example on doing
this.
// Martin
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