From ee16d16e23f53704722b111e8791be49000c2965 Mon Sep 17 00:00:00 2001
From: Teddy <ted.sybil@gmail.com>
Date: Sun, 4 May 2014 09:27:32 +0800
Subject: ...

---
 lib.s  | 14 --------------
 mips.c |  4 ++--
 ssa.c  |  6 ++++++
 3 files changed, 8 insertions(+), 16 deletions(-)

diff --git a/lib.s b/lib.s
index 8a42898..5ba5563 100644
--- a/lib.s
+++ b/lib.s
@@ -14,7 +14,6 @@ _func_printf:
 	addiu $12, $sp, 64
 # arg_1 = t0 + 4
 	addiu $12, $12, 4
-	sw $12, 16($sp)	#arg
 # goto __L2
 	j __L2
 __L1:
@@ -25,10 +24,8 @@ __L1:
 	beqz $13, __L20
 # fmt_4 = fmt_1 + 1
 	addiu $8, $8, 1
-	sw $8, 64($sp)	#fmt
 # ch_4 = fmt_4[0]
 	lb $9, 0($8)
-	sb $9, 12($sp)	#ch
 # t5 = ch_4 == 100
 	li $3, 100
 	seq $13, $9, $3
@@ -73,7 +70,6 @@ __L8:
 __L10:
 # x_4 = arg_2[0]
 	lw $10, 0($12)
-	sw $10, 4($sp)	#x
 # t15 = x_4 == 0
 	li $3, 0
 	seq $11, $10, $3
@@ -82,24 +78,20 @@ __L10:
 # len_11 = 1
 	li $2, 1
 	move $11 $2
-	sw $11, 8($sp)	#len
 # goto __L15
 	j __L15
 __L12:
 # len_8 = 0
 	li $2, 0
 	move $11 $2
-	sw $11, 8($sp)	#len
 # goto __L14
 	j __L14
 __L13:
 # x_7 = x_6 / 10
 	li $3, 10
 	divu $10, $10, $3
-	sw $10, 4($sp)	#x
 # len_10 = len_9 + 1
 	addiu $11, $11, 1
-	sw $11, 8($sp)	#len
 __L14:
 # if (x_6) goto __L13
 	bnez $10, __L13
@@ -107,7 +99,6 @@ __L15:
 # len_5 = 4 - len_4
 	li $2, 4
 	subu $11, $2, $11
-	sw $11, 8($sp)	#len
 # goto __L17
 	j __L17
 __L16:
@@ -119,7 +110,6 @@ __L16:
 # len_7 = len_6 - 1
 	li $3, 1
 	subu $11, $11, $3
-	sw $11, 8($sp)	#len
 __L17:
 # if (len_6) goto __L16
 	bnez $11, __L16
@@ -131,11 +121,9 @@ __L17:
 	jal _func___print_int
 # fmt_6 = fmt_4 + 2
 	addiu $8, $8, 2
-	sw $8, 64($sp)	#fmt
 __L19:
 # arg_4 = arg_2 + 4
 	addiu $12, $12, 4
-	sw $12, 16($sp)	#arg
 # goto __L21
 	j __L21
 __L20:
@@ -146,11 +134,9 @@ __L20:
 __L21:
 # fmt_3 = fmt_2 + 1
 	addiu $8, $8, 1
-	sw $8, 64($sp)	#fmt
 __L2:
 # ch_2 = fmt_1[0]
 	lb $9, 0($8)
-	sb $9, 12($sp)	#ch
 # if (ch_2) goto __L1
 	bnez $9, __L1
 _ret_printf:
diff --git a/mips.c b/mips.c
index 4e1c26e..27f7e58 100644
--- a/mips.c
+++ b/mips.c
@@ -92,7 +92,7 @@ void mips_store(int reg, COpr_t opr) {
     /* TODO: struct */
     if (var->global)
         printf("\t%s $%d, _%s\n", l, reg, var->name);
-    else
+    else if (opr->reg == -1)
         printf("\t%s $%d, %d($sp)\t#%s\n", l, reg, var->start, var->name);
 }
 
@@ -446,7 +446,7 @@ void mips_generate() {
                             if (i->src1->reg != -1)
                             {
                                 if (i->src1->kind == IMM)
-                                    printf("\tli$%d, %d\n", reg_v0, i->src1->info.imm);
+                                    printf("\tli $%d, %d\n", reg_v0, i->src1->info.imm);
                                 else
                                 {
                                     used_reg[i->src1->reg] = 1;
diff --git a/ssa.c b/ssa.c
index d69c959..31b82d7 100644
--- a/ssa.c
+++ b/ssa.c
@@ -1895,6 +1895,7 @@ void cinterv_union(COpr_t a, COpr_t b) {
     if (a == b) return;
     b->range = crange_merge(b->range, a->range);
     a->par = b;
+    b->mod |= a->mod;
 }
 
 void init_def() {
@@ -2132,6 +2133,11 @@ void register_alloc() {
                 colist_add(active, c); /* move cur to active */
             }
         }
+        else if (cur->mod)      /* may be referenced by a pointer */
+        {
+            cur->reg = -1;      /* assign a memory location to cur */
+            free(c);            /* and move cur to handled */
+        }
         else
         {
             cur->reg = reg; /* cur.reg <- any register in f */
-- 
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