From: kub <derkub@gmail.com>
Date: Wed, 5 Jan 2022 22:41:24 +0000 (+0100)
Subject: drc, tiny x86 optimisation
X-Git-Tag: v2.00~381
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cd184097221d29ec5cdf08ad2597a34066a6abe5;p=picodrive.git

drc, tiny x86 optimisation
---

diff --git a/cpu/drc/emit_x86.c b/cpu/drc/emit_x86.c
index 94111e0f..3ef2ed62 100644
--- a/cpu/drc/emit_x86.c
+++ b/cpu/drc/emit_x86.c
@@ -519,15 +519,23 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI,	// x86-64,i386 common
 
 // _r_r_imm - use lea
 #define emith_add_r_r_imm(d, s, imm) do { \
-	EMIT_REX_IF(0, d, s); \
-	emith_deref_modrm(0x8d, 2, d, s); \
-	EMIT(imm, s32); \
+	if (imm == 0) \
+		emith_move_r_r(d, s); \
+	else { \
+		EMIT_REX_IF(0, d, s); \
+		emith_deref_modrm(0x8d, 2, d, s); \
+		EMIT(imm, s32); \
+	} \
 } while (0)
 
 #define emith_add_r_r_ptr_imm(d, s, imm) do { \
-	EMIT_REX_IF(1, d, s); \
-	emith_deref_modrm(0x8d, 2, d, s); \
-	EMIT(imm, s32); \
+	if (imm == 0) \
+		emith_move_r_r_ptr(d, s); \
+	else { \
+		EMIT_REX_IF(1, d, s); \
+		emith_deref_modrm(0x8d, 2, d, s); \
+		EMIT(imm, s32); \
+	} \
 } while (0)
 
 #define emith_sub_r_r_imm(d, s, imm) do { \