From cfc1e4d0690ca16de5b010374e5f5cb6d000e2dc Mon Sep 17 00:00:00 2001
From: Wunkolo <Wunkolo@gmail.com>
Date: Mon, 23 Mar 2026 19:34:22 -0700
Subject: [PATCH] [a64] Optimize `EmitD3DCOLOR` constants

`3.0` works with `fmov`
---
 src/xenia/cpu/backend/a64/a64_seq_vector.cc | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/src/xenia/cpu/backend/a64/a64_seq_vector.cc b/src/xenia/cpu/backend/a64/a64_seq_vector.cc
index a02fe80b8..1708fb954 100644
--- a/src/xenia/cpu/backend/a64/a64_seq_vector.cc
+++ b/src/xenia/cpu/backend/a64/a64_seq_vector.cc
@@ -1434,8 +1434,7 @@ struct PACK : Sequence<PACK, I<OPCODE_PACK, V128Op, V128Op, V128Op>> {
     int d = i.dest.reg().getIdx();
     // Clamp to [3.0f, 3.0f + 255*2^-22].
     // fmaxnm/fminnm: NaN operand returns the non-NaN value (pack NaN as zero).
-    e.mov(e.w0, 0x40400000u);  // 3.0f
-    e.dup(VReg(0).s4, e.w0);
+    e.fmov(VReg(0).s4, 3.0f);
     e.fmaxnm(VReg(d).s4, VReg(s).s4, VReg(0).s4);
     e.mov(e.w0, 0x404000FFu);  // 3.0f + 255*2^-22
     e.dup(VReg(0).s4, e.w0);
@@ -1666,8 +1665,7 @@ struct UNPACK : Sequence<UNPACK, I<OPCODE_UNPACK, V128Op, V128Op>> {
     int d = i.dest.reg().getIdx();
     if (i.src1.is_constant && i.src1.value->IsConstantZero()) {
       // Zero -> 1.0f in all lanes.
-      e.mov(e.w0, 0x3F800000u);
-      e.dup(VReg(d).s4, e.w0);
+      e.fmov(VReg(d).s4, 1.0f);
       return;
     }
     // TBL: extract bytes from packed D3DCOLOR -> one byte per lane.
@@ -1680,8 +1678,7 @@ struct UNPACK : Sequence<UNPACK, I<OPCODE_UNPACK, V128Op, V128Op>> {
     LoadV128Const(e, 1, ctrl);
     e.tbl(VReg(d).b16, VReg(s).b16, 1, VReg(1).b16);
     // OR with 1.0f (0x3F800000) to form the magic float.
-    e.mov(e.w0, 0x3F800000u);
-    e.dup(VReg(0).s4, e.w0);
+    e.fmov(VReg(0).s4, 1.0f);
     e.orr(VReg(d).b16, VReg(d).b16, VReg(0).b16);
   }
   static void EmitCallHelper(A64Emitter& e, const EmitArgType& i, void* fn) {