From 415fc458be52095395236d80a7c402cb77b0b718 Mon Sep 17 00:00:00 2001
From: ptitSeb <sebastien.chev@gmail.com>
Date: Mon, 2 Dec 2024 16:19:06 +0100
Subject: [ARM64_DYNAREC] Improved some x87 opcode behaviour

---
 src/dynarec/dynarec_native_functions.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

(limited to 'src/dynarec/dynarec_native_functions.c')

diff --git a/src/dynarec/dynarec_native_functions.c b/src/dynarec/dynarec_native_functions.c
index e2e149f2..4b72ea01 100644
--- a/src/dynarec/dynarec_native_functions.c
+++ b/src/dynarec/dynarec_native_functions.c
@@ -59,10 +59,20 @@ void native_fpatan(x64emu_t* emu)
 }
 void native_fxtract(x64emu_t* emu)
 {
-    int32_t tmp32s = (ST1.q&0x7ff0000000000000LL)>>52;
-    tmp32s -= 1023;
-    ST1.d /= exp2(tmp32s);
-    ST0.d = tmp32s;
+    int tmp32s;
+    if(isnan(ST1.d)) {
+        ST0.d = ST1.d;
+    } else if(isinf(ST1.d)) {
+        ST0.d = ST1.d;
+        ST1.d = INFINITY;
+    } else if(ST1.d==0.0) {
+        ST0.d = ST1.d;
+        ST1.d = -INFINITY;
+    } else {
+        // LD80bits doesn't have implicit "1" bit, so need to adjust for that
+        ST0.d = frexp(ST1.d, &tmp32s)*2;
+        ST1.d = tmp32s-1;
+    }
 }
 void native_fprem(x64emu_t* emu)
 {
-- 
cgit 1.4.1