[PATCH] mips: Optimize ldx* generators

[Paul Cercueil]

There is no need to use a temporary register, when the r0 destination
register can be used instead.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 lib/jit_mips-cpu.c | 98 +++++++++++++---------------------------------
 1 file changed, 28 insertions(+), 70 deletions(-)

diff --git a/lib/jit_mips-cpu.c b/lib/jit_mips-cpu.c
index 9dbafd6..fee94b5 100644
--- a/lib/jit_mips-cpu.c
+++ b/lib/jit_mips-cpu.c
@@ -1657,120 +1657,90 @@ _ldi_l(jit_state_t *_jit, jit_int32_t r0, jit_word_t 
i0)
 static void
 _ldxr_c(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1 ,jit_int32_t r2)
 {
-    jit_int32_t                reg;
-    reg = jit_get_reg(jit_class_gpr);
-    addr(rn(reg), r1, r2);
-    ldr_c(r0, rn(reg));
-    jit_unget_reg(reg);
+    addr(r0, r1, r2);
+    ldr_c(r0, r0);
 }
 
 static void
 _ldxi_c(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1, jit_word_t i0)
 {
-    jit_int32_t                reg;
     if (can_sign_extend_short_p(i0))
        LB(r0, i0, r1);
     else {
-       reg = jit_get_reg(jit_class_gpr);
-       addi(rn(reg), r1, i0);
-       ldr_c(r0, rn(reg));
-       jit_unget_reg(reg);
+       addi(r0, r1, i0);
+       ldr_c(r0, r0);
     }
 }
 
 static void
 _ldxr_uc(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1 ,jit_int32_t r2)
 {
-    jit_int32_t                reg;
-    reg = jit_get_reg(jit_class_gpr);
-    addr(rn(reg), r1, r2);
-    ldr_uc(r0, rn(reg));
-    jit_unget_reg(reg);
+    addr(r0, r1, r2);
+    ldr_uc(r0, r0);
 }
 
 static void
 _ldxi_uc(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1, jit_word_t i0)
 {
-    jit_int32_t                reg;
     if (can_sign_extend_short_p(i0))
        LBU(r0, i0, r1);
     else {
-       reg = jit_get_reg(jit_class_gpr);
-       addi(rn(reg), r1, i0);
-       ldr_uc(r0, rn(reg));
-       jit_unget_reg(reg);
+       addi(r0, r1, i0);
+       ldr_uc(r0, r0);
     }
 }
 
 static void
 _ldxr_s(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1 ,jit_int32_t r2)
 {
-    jit_int32_t                reg;
-    reg = jit_get_reg(jit_class_gpr);
-    addr(rn(reg), r1, r2);
-    ldr_s(r0, rn(reg));
-    jit_unget_reg(reg);
+    addr(r0, r1, r2);
+    ldr_s(r0, r0);
 }
 
 static void
 _ldxi_s(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1, jit_word_t i0)
 {
-    jit_int32_t                reg;
     if (can_sign_extend_short_p(i0))
        LH(r0, i0, r1);
     else {
-       reg = jit_get_reg(jit_class_gpr);
-       addi(rn(reg), r1, i0);
-       ldr_s(r0, rn(reg));
-       jit_unget_reg(reg);
+       addi(r0, r1, i0);
+       ldr_s(r0, r0);
     }
 }
 
 static void
 _ldxr_us(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1 ,jit_int32_t r2)
 {
-    jit_int32_t                reg;
-    reg = jit_get_reg(jit_class_gpr);
-    addr(rn(reg), r1, r2);
-    ldr_us(r0, rn(reg));
-    jit_unget_reg(reg);
+    addr(r0, r1, r2);
+    ldr_us(r0, r0);
 }
 
 static void
 _ldxi_us(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1, jit_word_t i0)
 {
-    jit_int32_t                reg;
     if (can_sign_extend_short_p(i0))
        LHU(r0, i0, r1);
     else {
-       reg = jit_get_reg(jit_class_gpr);
-       addi(rn(reg), r1, i0);
-       ldr_us(r0, rn(reg));
-       jit_unget_reg(reg);
+       addi(r0, r1, i0);
+       ldr_us(r0, r0);
     }
 }
 
 static void
 _ldxr_i(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1 ,jit_int32_t r2)
 {
-    jit_int32_t                reg;
-    reg = jit_get_reg(jit_class_gpr);
-    addr(rn(reg), r1, r2);
-    ldr_i(r0, rn(reg));
-    jit_unget_reg(reg);
+    addr(r0, r1, r2);
+    ldr_i(r0, r0);
 }
 
 static void
 _ldxi_i(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1, jit_word_t i0)
 {
-    jit_int32_t                reg;
     if (can_sign_extend_short_p(i0))
        LW(r0, i0, r1);
     else {
-       reg = jit_get_reg(jit_class_gpr);
-       addi(rn(reg), r1, i0);
-       ldr_i(r0, rn(reg));
-       jit_unget_reg(reg);
+       addi(r0, r1, i0);
+       ldr_i(r0, r0);
     }
 }
 
@@ -1778,48 +1748,36 @@ _ldxi_i(jit_state_t *_jit, jit_int32_t r0, jit_int32_t 
r1, jit_word_t i0)
 static void
 _ldxr_ui(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1 ,jit_int32_t r2)
 {
-    jit_int32_t                reg;
-    reg = jit_get_reg(jit_class_gpr);
-    addr(rn(reg), r1, r2);
-    ldr_ui(r0, rn(reg));
-    jit_unget_reg(reg);
+    addr(r0, r1, r2);
+    ldr_ui(r0, r0);
 }
 
 static void
 _ldxi_ui(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1, jit_word_t i0)
 {
-    jit_int32_t                reg;
     if (can_sign_extend_short_p(i0))
        LWU(r0, i0, r1);
     else {
-       reg = jit_get_reg(jit_class_gpr);
-       addi(rn(reg), r1, i0);
-       ldr_ui(r0, rn(reg));
-       jit_unget_reg(reg);
+       addi(r0, r1, i0);
+       ldr_ui(r0, r0);
     }
 }
 
 static void
 _ldxr_l(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1 ,jit_int32_t r2)
 {
-    jit_int32_t                reg;
-    reg = jit_get_reg(jit_class_gpr);
-    addr(rn(reg), r1, r2);
-    ldr_l(r0, rn(reg));
-    jit_unget_reg(reg);
+    addr(r0, r1, r2);
+    ldr_l(r0, r0);
 }
 
 static void
 _ldxi_l(jit_state_t *_jit, jit_int32_t r0, jit_int32_t r1, jit_word_t i0)
 {
-    jit_int32_t                reg;
     if (can_sign_extend_short_p(i0))
        LD(r0, i0, r1);
     else {
-       reg = jit_get_reg(jit_class_gpr);
-       addi(rn(reg), r1, i0);
-       ldr_l(r0, rn(reg));
-       jit_unget_reg(reg);
+       addi(r0, r1, i0);
+       ldr_l(r0, r0);
     }
 }
 #endif
-- 
2.39.1