From: kub <derkub@gmail.com>
Date: Tue, 16 Mar 2021 20:31:45 +0000 (+0100)
Subject: sh2 drc, x86 backend, optimize move #0 with xor
X-Git-Tag: v2.00~584
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6f64058800400bf5adb9eee9060505234ac5941d;p=picodrive.git

sh2 drc, x86 backend, optimize move #0 with xor
---

diff --git a/cpu/drc/emit_x86.c b/cpu/drc/emit_x86.c
index 94111e0f..47124498 100644
--- a/cpu/drc/emit_x86.c
+++ b/cpu/drc/emit_x86.c
@@ -383,9 +383,12 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI,	// x86-64,i386 common
 
 // _r_imm
 #define emith_move_r_imm(r, imm) do { \
-	EMIT_REX_IF(0, 0, r); \
-	EMIT_OP(0xb8 + ((r)&7)); \
-	EMIT(imm, u32); \
+	if (imm) { \
+		EMIT_REX_IF(0, 0, r); \
+		EMIT_OP(0xb8 + ((r)&7)); \
+		EMIT(imm, u32); \
+	} else \
+		emith_eor_r_r(r, r); \
 } while (0)
 
 #define emith_move_r_ptr_imm(r, imm) do { \