From: notaz <notasas@gmail.com>
Date: Sun, 3 Dec 2017 15:41:30 +0000 (+0200)
Subject: drc: arm: use movw/movt
X-Git-Tag: v1.93~20
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?p=picodrive.git;a=commitdiff_plain;h=98a3d79ba2d05e8883f8e3761f866cb4fa17c214

drc: arm: use movw/movt

it's about time...
---

diff --git a/cpu/drc/emit_arm.c b/cpu/drc/emit_arm.c
index 64face1..eb5f332 100644
--- a/cpu/drc/emit_arm.c
+++ b/cpu/drc/emit_arm.c
@@ -243,6 +243,11 @@
 #define EOP_MSR_IMM(ror2,imm) EOP_C_MSR_IMM(A_COND_AL,ror2,imm)
 #define EOP_MSR_REG(rm)       EOP_C_MSR_REG(A_COND_AL,rm)
 
+#define EOP_MOVW(rd,imm) \
+	EMIT(0xe3000000 | ((rd)<<12) | ((imm)&0xfff) | (((imm)<<4)&0xf0000))
+
+#define EOP_MOVT(rd,imm) \
+	EMIT(0xe3400000 | ((rd)<<12) | (((imm)>>16)&0xfff) | (((imm)>>12)&0xf0000))
 
 // XXX: AND, RSB, *C, will break if 1 insn is not enough
 static void emith_op_imm2(int cond, int s, int op, int rd, int rn, unsigned int imm)
@@ -257,6 +262,19 @@ static void emith_op_imm2(int cond, int s, int op, int rd, int rn, unsigned int
 			imm = ~imm;
 			op = A_OP_MVN;
 		}
+#ifdef HAVE_ARMV7
+		for (v = imm, ror2 = 0; v && !(v & 3); v >>= 2)
+			ror2--;
+		if (v >> 8) {
+			/* 2+ insns needed - prefer movw/movt */
+			if (op == A_OP_MVN)
+				imm = ~imm;
+			EOP_MOVW(rd, imm);
+			if (imm & 0xffff0000)
+				EOP_MOVT(rd, imm);
+			return;
+		}
+#endif
 		break;
 
 	case A_OP_EOR:
diff --git a/cpu/sh2/compiler.c b/cpu/sh2/compiler.c
index e18f43c..a7c71c3 100644
--- a/cpu/sh2/compiler.c
+++ b/cpu/sh2/compiler.c
@@ -29,6 +29,7 @@
 #include <assert.h>
 
 #include "../../pico/pico_int.h"
+#include "../../pico/arm_features.h"
 #include "sh2.h"
 #include "compiler.h"
 #include "../drc/cmn.h"