1.8. PRINTF() WITH SEVERAL ARGUMENTS
; pass 1st argument in $a0:
lui $4,%hi($LC0)
; pass 9th argument in stack:
li $2,8 # 0x8
sw $2,32($sp)
addiu $4,$4,%lo($LC0)
; pass 2nd argument in $a1:
li $5,1 # 0x1
; pass 3rd argument in $a2:
li $6,2 # 0x2
; call printf():
jalr $25
; pass 4th argument in $a3 (branch delay slot):
li $7,3 # 0x3
; function epilogue:
lw $31,52($sp)
; set return value to 0:
move $2,$0
; return
j $31
addiu $sp,$sp,56 ; branch delay slot
Listing 1.59: Optimizing GCC 4.4.5 (IDA).text:00000000 main:
.text:00000000
.text:00000000 var_28 = -0x28
.text:00000000 var_24 = -0x24
.text:00000000 var_20 = -0x20
.text:00000000 var_1C = -0x1C
.text:00000000 var_18 = -0x18
.text:00000000 var_10 = -0x10
.text:00000000 var_4 = -4
.text:00000000
; function prologue:
.text:00000000 lui $gp, (gnu_local_gp >> 16)
.text:00000004 addiu $sp, -0x38
.text:00000008 la $gp, (gnu_local_gp & 0xFFFF)
.text:0000000C sw $ra, 0x38+var_4($sp)
.text:00000010 sw $gp, 0x38+var_10($sp)
; pass 5th argument in stack:
.text:00000014 li $v0, 4
.text:00000018 sw $v0, 0x38+var_28($sp)
; pass 6th argument in stack:
.text:0000001C li $v0, 5
.text:00000020 sw $v0, 0x38+var_24($sp)
; pass 7th argument in stack:
.text:00000024 li $v0, 6
.text:00000028 sw $v0, 0x38+var_20($sp)
; pass 8th argument in stack:
.text:0000002C li $v0, 7
.text:00000030 lw $t9, (printf & 0xFFFF)($gp)
.text:00000034 sw $v0, 0x38+var_1C($sp)
; prepare 1st argument in $a0:
.text:00000038 lui $a0, ($LC0 >> 16) # "a=%d; b=%d; c=%d; d=%d; e=%d; f=%d⤦
Ç; g=%"...
; pass 9th argument in stack:
.text:0000003C li $v0, 8
.text:00000040 sw $v0, 0x38+var_18($sp)
; pass 1st argument in $a0:
.text:00000044 la $a0, ($LC0 & 0xFFFF) # "a=%d; b=%d; c=%d; d=%d; e=%d; f⤦
Ç=%d; g=%"...
; pass 2nd argument in $a1:
.text:00000048 li $a1, 1
; pass 3rd argument in $a2:
.text:0000004C li $a2, 2
; call printf():
.text:00000050 jalr $t9
; pass 4th argument in $a3 (branch delay slot):