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authorChristian Krinitsin <mail@krinitsin.com>2025-07-17 09:10:43 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-17 09:10:43 +0200
commitf2ec263023649e596c5076df32c2d328bc9393d2 (patch)
tree5dd86caab46e552bd2e62bf9c4fb1a7504a44db4 /results/scraper/fex/3670
parent63d2e9d409831aa8582787234cae4741847504b7 (diff)
downloadqemu-analysis-main.tar.gz
qemu-analysis-main.zip
add downloaded fex bug-reports HEAD main
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+Fallout: New Vegas slow in-game due to x87 soft float
+Both its primary thread and another logic thread are maxing out two CPU cores due to x87 soft float.

+This game requires softfloat because logic is otherwise broken with reduced precision mode.

+- NPCs stop walking

+- Character movement with keyboard does stutter stepping

+

+```

+Tested by walking outside of the starting house and staring directly at the floor.

+

+// Primary Thread

+// 27.2% - In X87 softfloat handlers

+

+// Logic Thread? - Total 50.65%

+// 7.58% - F80ADD

+// 6.9% - softfloat_roundPackToExtF80

+// 6.76% - F80SUB

+// 5.60% - softfloat_subMagsExtF80

+// 4.77% + 0.14% - F80CVT

+// 4.62% + 0.18% - F80CVTTO

+// 3.47% - softfloat_addMagsExtF80

+// 3.33% - extF80_mul

+// 2.77% - softfloat_roundPackToF32

+// 2.06% - f32_to_extF80

+// 1.65% - F80MUL

+// 0.51% - F80CVTINT

+// 0.31% - F80CMP

+```
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