Question

Problem 1: (20 marks) Part 1: (15 points) Compile the RISC-V assembly code for the following C code. Assume that n and k are passed in x3 and x4 respectively. Values n and k are initialized to 14 and 14. Assume that result returned in register fl and that double precision numbers are used. After you are done store the result in address: 12(x3). Are you allowed to? If not, what is the minimum change you need to make so that you make this action possible Compile the assembly code for the following C code int func (int n, int k)1 if (n>18) return 0; else if (<-1) return 1; else if (k 2) return n; else if (k>17) return 1,; else if (n<4) return 5; else return (3.25*func (n-2,k+1)+0.5*func (n+1, k-3)+2.5*k+ n/4) Part 2 (5 marks) How many RISC-V instructions does it take to implement the C code from Part 1? What is the total number of RISC-V instructions that is executed to complete the loop?

please code using risc-v language and make it as simple as possible

Answer 1

//RISC-V assembly code for the above-given question

//the execution program following as

//the code as follows fo rthe above given question

.file "code.cpp"
.text
.section .rodata
.type _ZStL19piecewise_construct, @object
.size _ZStL19piecewise_construct, 1
_ZStL19piecewise_construct:
.zero 1
.local _ZStL8__ioinit
.comm _ZStL8__ioinit,1,1
.text
.globl _Z4funcii
.type _Z4funcii, @function
_Z4funcii:
.LFB1493:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
subq $16, %rsp
movl %edi, -4(%rbp)
movl %esi, -8(%rbp)
cmpl $18, -4(%rbp)
jle .L2
movl $0, %eax
jmp .L3
.L2:
cmpl $1, -4(%rbp)
jg .L4
movl $1, %eax
jmp .L3
.L4:
cmpl $2, -8(%rbp)
jg .L5
movl -4(%rbp), %eax
jmp .L3
.L5:
cmpl $17, -8(%rbp)
jle .L6
movl $1, %eax
jmp .L3
.L6:
cmpl $3, -4(%rbp)
jg .L7
movl $5, %eax
jmp .L3
.L7:
movl -8(%rbp), %eax
leal 1(%rax), %edx
movl -4(%rbp), %eax
subl $2, %eax
movl %edx, %esi
movl %eax, %edi
call _Z4funcii
cvtsi2sd %eax, %xmm0
movsd .LC0(%rip), %xmm1
mulsd %xmm1, %xmm0
movsd %xmm0, -16(%rbp)
movl -8(%rbp), %eax
leal -3(%rax), %edx
movl -4(%rbp), %eax
addl $1, %eax
movl %edx, %esi
movl %eax, %edi
call _Z4funcii
cvtsi2sd %eax, %xmm0
movsd .LC1(%rip), %xmm1
mulsd %xmm1, %xmm0
movsd -16(%rbp), %xmm1
addsd %xmm0, %xmm1
cvtsi2sd -8(%rbp), %xmm0
movsd .LC2(%rip), %xmm2
mulsd %xmm2, %xmm0
addsd %xmm0, %xmm1
movl -4(%rbp), %eax
leal 3(%rax), %edx
testl %eax, %eax
cmovs %edx, %eax
sarl $2, %eax
cvtsi2sd %eax, %xmm0
addsd %xmm1, %xmm0
cvttsd2si %xmm0, %eax
.L3:
leave
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1493:
.size _Z4funcii, .-_Z4funcii
.globl main
.type main, @function
main:
.LFB1494:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
subq $16, %rsp
movl $14, -8(%rbp)
movl $14, -4(%rbp)
movl -4(%rbp), %edx
movl -8(%rbp), %eax
movl %edx, %esi
movl %eax, %edi
call _Z4funcii
movl $0, %eax
leave
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1494:
.size main, .-main
.type _Z41__static_initialization_and_destruction_0ii, @function
_Z41__static_initialization_and_destruction_0ii:
.LFB1975:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
subq $16, %rsp
movl %edi, -4(%rbp)
movl %esi, -8(%rbp)
cmpl $1, -4(%rbp)
jne .L12
cmpl $65535, -8(%rbp)
jne .L12
leaq _ZStL8__ioinit(%rip), %rdi
call _ZNSt8ios_base4InitC1Ev@PLT
leaq __dso_handle(%rip), %rdx
leaq _ZStL8__ioinit(%rip), %rsi
movq _ZNSt8ios_base4InitD1Ev@GOTPCREL(%rip), %rax
movq %rax, %rdi
call __cxa_atexit@PLT
.L12:
nop
leave
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1975:
.size _Z41__static_initialization_and_destruction_0ii, .-_Z41__static_initialization_and_destruction_0ii
.type _GLOBAL__sub_I__Z4funcii, @function
_GLOBAL__sub_I__Z4funcii:
.LFB1976:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
movl $65535, %esi
movl $1, %edi
call _Z41__static_initialization_and_destruction_0ii
popq %rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1976:
.size _GLOBAL__sub_I__Z4funcii, .-_GLOBAL__sub_I__Z4funcii
.section .init_array,"aw"
.align 8
.quad _GLOBAL__sub_I__Z4funcii
.section .rodata
.align 8
.LC0:
.long 0
.long 1074397184
.align 8
.LC1:
.long 0
.long 1071644672
.align 8
.LC2:
.long 0
.long 1074003968
.hidden __dso_handle
.ident "GCC: (Ubuntu 7.3.0-16ubuntu3) 7.3.0"
.section .note.GNU-stack,"",@progbits

//End of program

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