Adjust gen_needcarry implementation

Imported from: https://www.vogons.org/viewtopic.php?p=805825#p805825
dosbox-staging · Dec 10, 2019 · 9195147 · 9195147
1 parent fc321a7
commit 9195147
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/src/cpu/core_dyn_x86/risc_x64.h b/src/cpu/core_dyn_x86/risc_x64.h
@@ -469,7 +469,11 @@ static void gen_discardflags(void) {
 }
 
 static void gen_needcarry(void) {
-	gen_needflags();
+	if (!x64gen.flagsactive) {
+		x64gen.flagsactive=true;
+		opcode(4).setea(4,-1,0,CALLSTACK+8).setimm(0,1).Emit16(0xBA0F);  // bt [rsp+8/40], 0
+		opcode(4).set64().setea(4,-1,0,CALLSTACK+16).Emit8(0x8D);       // lea rsp, [rsp+16/48]
+	}
 }
 
 static void gen_setzeroflag(void) {