[PATCH 1/3] mips: Don't generate anything in jit_movr if O1 == O2

[Paul Cercueil]

Lightning would previously generate a "move $x, $x" opcode, which is
effectively a NOP.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 lib/jit_mips-cpu.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/jit_mips-cpu.c b/lib/jit_mips-cpu.c
index 766af0d..57fc2bf 100644
--- a/lib/jit_mips-cpu.c
+++ b/lib/jit_mips-cpu.c
@@ -494,7 +494,8 @@ static void 
_ori(jit_state_t*,jit_int32_t,jit_int32_t,jit_word_t);
 #  define xorr(r0,r1,r2)               XOR(r0,r1,r2)
 #  define xori(r0,r1,i0)               _xori(_jit,r0,r1,i0)
 static void _xori(jit_state_t*,jit_int32_t,jit_int32_t,jit_word_t);
-#  define movr(r0,r1)                  orr(r0,r1,_ZERO_REGNO)
+#  define movr(r0,r1)                  _movr(_jit,r0,r1)
+static void _movr(jit_state_t*,jit_int32_t,jit_int32_t);
 #  define movi(r0,i0)                  _movi(_jit,r0,i0)
 static void _movi(jit_state_t*,jit_int32_t,jit_word_t);
 #  define movi_p(r0,i0)                        _movi_p(_jit,r0,i0)
@@ -1196,6 +1197,13 @@ _xori(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1, 
jit_word_t i0)
     }
 }
 
+static void
+_movr(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1)
+{
+    if (r0 != r1)
+       orr(r0, r1, _ZERO_REGNO);
+}
+
 static void
 _movi(jit_state_t *_jit, jit_int32_t r0, jit_word_t i0)
 {
-- 
2.30.2