From 996fa013d01cb7bada333967ed1a72d359e3179d Mon Sep 17 00:00:00 2001
From: Skyth <19259897+blueskythlikesclouds@users.noreply.github.com>
Date: Fri, 13 Sep 2024 15:26:03 +0300
Subject: [PATCH] Implement float comparison instruction.

---
 PowerRecomp/main.cpp     |  1 +
 PowerUtils/ppc_context.h | 15 ++++++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/PowerRecomp/main.cpp b/PowerRecomp/main.cpp
index 05856e1..369d477 100644
--- a/PowerRecomp/main.cpp
+++ b/PowerRecomp/main.cpp
@@ -341,6 +341,7 @@ int main()
                     break;
 
                 case PPC_INST_FCMPU:
+                    std::println(f, "\tctx.cr{}.compare(ctx.f{}.f64, ctx.f{}.f64);", insn.operands[0], insn.operands[1], insn.operands[2]);
                     break;
 
                 case PPC_INST_FCTID:
diff --git a/PowerUtils/ppc_context.h b/PowerUtils/ppc_context.h
index 4c5b029..d4b4a34 100644
--- a/PowerUtils/ppc_context.h
+++ b/PowerUtils/ppc_context.h
@@ -1,6 +1,7 @@
 #pragma once
 #include <cstdint>
 #include <cstdlib>
+#include <cmath>
 
 #ifdef __clang__
 #include <x86intrin.h>
@@ -53,7 +54,11 @@ struct PPCCRRegister
     uint8_t lt;
     uint8_t gt;
     uint8_t eq;
-    uint8_t so;
+    union
+    {
+        uint8_t so;
+        uint8_t un;
+    };
 
     template<typename T>
     void compare(T left, T right, const PPCXERRegister& xer)
@@ -63,6 +68,14 @@ struct PPCCRRegister
         eq = left == right;
         so = xer.so;
     }
+
+    void compare(double left, double right)
+    {
+        lt = left < right;
+        gt = left > right;
+        eq = left == right;
+        un = isnan(left) || isnan(right);
+    }
 };
 
 typedef float float128[4];