From 83f38388a1657a9572d667ed384ee033768f836d Mon Sep 17 00:00:00 2001
From: Sintendo <bram.speeckaert@gmail.com>
Date: Thu, 4 Mar 2021 22:45:45 +0100
Subject: [PATCH] Jit64: divwx - Micro-optimize default case

Both the normal path and the overflow path end with the same
instruction, so their tails can be merged.

Before:
41 8B C7             mov         eax,r15d
45 85 C0             test        r8d,r8d
74 0D                je          overflow
3D 00 00 00 80       cmp         eax,80000000h
75 0E                jne         normal_path
41 83 F8 FF          cmp         r8d,0FFFFFFFFh
75 08                jne         normal_path
overflow:
C1 F8 1F             sar         eax,1Fh
44 8B F0             mov         r14d,eax
EB 07                jmp         done
normal_path:
99                   cdq
41 F7 F8             idiv        eax,r8d
44 8B F0             mov         r14d,eax
done:

After:
41 8B C7             mov         eax,r15d
45 85 C0             test        r8d,r8d
74 0D                je          overflow
3D 00 00 00 80       cmp         eax,80000000h
75 0B                jne         normal_path
41 83 F8 FF          cmp         r8d,0FFFFFFFFh
75 05                jne         normal_path
overflow:
C1 F8 1F             sar         eax,1Fh
EB 04                jmp         done
normal_path:
99                   cdq
41 F7 F8             idiv        eax,r8d
done:
44 8B F0             mov         r14d,eax
---
 Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp b/Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp
index 464bcb4521..1db3836dab 100644
--- a/Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp
+++ b/Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp
@@ -1566,7 +1566,6 @@ void Jit64::divwx(UGeckoInstruction inst)
 
     SetJumpTarget(overflow);
     SAR(32, eax, Imm8(31));
-    MOV(32, Rd, eax);
     if (inst.OE)
     {
       GenerateConstantOverflow(true);
@@ -1578,12 +1577,13 @@ void Jit64::divwx(UGeckoInstruction inst)
 
     CDQ();
     IDIV(32, Rb);
-    MOV(32, Rd, eax);
     if (inst.OE)
     {
       GenerateConstantOverflow(false);
     }
+
     SetJumpTarget(done);
+    MOV(32, Rd, eax);
   }
   if (inst.Rc)
     ComputeRC(d);