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Zhang Fuxin
2021-10-27 19:14:51 +08:00
commit c632bed67e
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materials/chapter2/switch_case.S Normal file
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st:
addi.w $t0,$a0, -10 //a-10
sltiu $t1,$t0, 8
beqz $t1, default //if (a-10)>=8
//goto default
la $t2, jr_table
alsl.d $t1, $t1, $t2, 3
//(a-10)*8+jr_table
ld.d $t0, $t1, 0
jr $t0
default:
or $a1,$a0,$r0
case_14:
or $a0,$a1,$r0
jr $ra //return b for case_14,
//return a for default
case_15:
andi $a2,$a1,0xf //b & 0xf
case_10:
addi.w $a1,$a2,50 //c+50
b case_14
case_12_17:
addi.w $a1,$a1,50 //b+50
b case_14
# jump table
.section .rodata
.align 3
jr_table:
.dword case_10
.dword default
.dword case_12_17
.dword default
.dword case_14
.dword case_15
.dword default
.dword case_12_17