dolphin

mirror of https://github.com/dolphin-emu/dolphin.git synced 2025-01-24 15:01:16 +01:00

History

JosJuice 709b64d310 JitArm64: Fix frsqrte misclassifying large negative inputs as NaN

The frsqrte routine has a little trick where it uses
`TBNZ(ARM64Reg::X1, 62)` to check if the input is NaN/Inf. This only
works if we've checked that the input isn't normal. While we have
checked that the input isn't a positive normal at this point, it could
still be a negative normal. Because of this, the frsqrte routine would
incorrectly treat certain negative normal inputs as NaNs, causing it to
output the wrong exception in FPSCR (while still producing the correct
numerical value).

To fix the problem, I'm swapping the order of the lines
`FixupBranch nan_or_inf = TBNZ(ARM64Reg::X1, 62);` and
`FixupBranch negative = TBNZ(ARM64Reg::X1, 63);`, and then instead of
having the `nan_or_inf` case do a special check for negative infinity,
I'm making the `negative` case do a special check for NaN. The total
instruction count is the same.

2024-12-26 12:05:41 +01:00

Android

Merge pull request #13091 from mitaclaw/ranges-modernization-2-returns

2024-12-20 12:50:19 -05:00

Core

JitArm64: Fix frsqrte misclassifying large negative inputs as NaN

2024-12-26 12:05:41 +01:00

DSPSpy

Simplify std::fill with std::fill_n

2024-10-07 15:34:56 -07:00

DSPTool

GDBStub: Signal Breakpoint Changes To Host