From 486aa58b157c74d2d0623eecd08489fb520a5510 Mon Sep 17 00:00:00 2001
From: ptitSeb <sebastien.chev@gmail.com>
Date: Sun, 11 Jul 2021 21:58:59 +0200
Subject: Added 66 0F 3A 0A opcode (for #33)

---
 src/emu/x64run660f.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'src')

diff --git a/src/emu/x64run660f.c b/src/emu/x64run660f.c
index c4fabf44..5eee4f56 100644
--- a/src/emu/x64run660f.c
+++ b/src/emu/x64run660f.c
@@ -373,6 +373,30 @@ int Run660F(x64emu_t *emu, rex_t rex)
     case 0x3A:  // these are some SSE3 & SSE4.x opcodes
         opcode = F8;
         switch(opcode) {
+            case 0x0A:          // ROUNDSS Gx, Ex, u8
+                nextop = F8;
+                GETEX(1);
+                GETGX;
+                tmp8u = F8; // ignoring bit 3 interupt thingy
+                if(tmp8u&4)
+                    tmp8u = (emu->mxcsr>>13)&3;
+                else
+                    tmp8u &= 3;
+                switch(tmp8u) {
+                    case ROUND_Nearest:
+                        GX->f[0] = floor(EX->f[0]+0.5);
+                        break;
+                    case ROUND_Down:
+                        GX->f[0] = floor(EX->f[0]);
+                        break;
+                    case ROUND_Up:
+                        GX->f[0] = ceil(EX->f[0]);
+                        break;
+                    case ROUND_Chop:
+                        GX->f[0] = EX->f[0];
+                        break;
+                }
+                break;
             case 0x0B:          // ROUNDSD Gx, Ex, u8
                 nextop = F8;
                 GETEX(1);
-- 
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