drc: arm: use movw/movt

[picodrive.git] / cpu / drc / emit_arm.c

diff --git a/cpu/drc/emit_arm.c b/cpu/drc/emit_arm.c
index 64face1..eb5f332 100644 (file)
--- 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: