UserspaceEmulator: Use long double in FABS

`fpu_get` returns a long double and `fpu_set` expects a long double as its parameter, and the X87 FPU uses long doubles as its internal storage, meaning the `FABS` operates on them. This means the correct intrinsic function for implementing it is `__builtin_fabsl`.
Author: https://github.com/BertalanD Commit: 3bdefb4623 Pull-request: https://github.com/SerenityOS/serenity/pull/8470 Reviewed-by: https://github.com/Dexesttp Reviewed-by: https://github.com/Hendiadyoin1 Reviewed-by: https://github.com/alimpfard Reviewed-by: https://github.com/gunnarbeutner ✅
2025-06-11 10:18:15 +09:00 · 2021-07-05 19:35:52 +02:00 · 2021-07-05 19:35:52 +02:00 · 3bdefb4623 · 2024-07-18 10:05:36 +09:00
commit 3bdefb4623
parent a36c37db47
1 changed files with 1 additions and 1 deletions
--- a/Userland/DevTools/UserspaceEmulator/SoftCPU.cpp
+++ b/Userland/DevTools/UserspaceEmulator/SoftCPU.cpp
@ -1565,7 +1565,7 @@ void SoftCPU::FCHS(const X86::Instruction&)

 void SoftCPU::FABS(const X86::Instruction&)
 {
-    fpu_set(0, __builtin_fabs(fpu_get(0)));
+    fpu_set(0, __builtin_fabsl(fpu_get(0)));
 }

 void SoftCPU::FTST(const X86::Instruction&) { TODO_INSN(); }