# Solution to Problem 2.19.4 Recitation #1 (Week 2) ECEN350 Prof. Choi.

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Solution to Problem 2.19.4 Recitation #1 (Week 2) ECEN350 Prof. Choi

a)f(a,b,c)=func(func(a,b),c) f: addi \$sp,\$sp,–8 sw \$ra,4(\$sp) sw \$s0,0(\$sp) move \$s0,\$a2 jal func #v0=func(\$a0,\$a1)=func(a,b) move \$a0,\$v0# \$a0= func(a,b) move \$a1,\$s0# \$a1=c jal func# v0=func(\$a0,\$a1)=func(\$v0,c)=func(func(a,b),c) lw \$ra,4(\$sp) lw \$s0,0(\$sp) addi \$sp,\$sp,8 jr \$ra

b) f(a,b,c)=func(a,b)+func(b,c) f: addi \$sp,\$sp,–12 sw \$ra,8(\$sp) sw \$s1,4(\$sp) sw \$s0,0(\$sp) move \$s0,\$a1 move \$s1,\$a2 jal func# \$v0=func(\$a0,\$a1)=func(a,b) move \$a0,\$s0# \$a0=b move \$a1,\$s1#\$a1=c move \$s0,\$v0# \$s0=\$v0=func(a,b) jal func;#\$v0=func(\$a0,\$a1)=func(b,c) add \$v0,\$v0,\$s0#\$v0=func(a,b)+func(b,c) lw \$ra,8(\$sp) lw \$s1,4(\$sp) lw \$s0,0(\$sp) addi \$sp,\$sp,12 jr ra

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