editing this assembly code to only use add/subtract/shift - c

Question

.file "calcnew.c"
.text
.globl calcnew
.type calcnew, #function
calcnew:
pushl %ebp
movl %esp, %ebp
movl 8(%ebp), %edx
movl 12(%ebp), %ecx
leal 0(,%ecx,8), %eax
subl %ecx, %eax
leal (%edx,%edx,2), %edx
addl %edx, %eax
imull $14, 16(%ebp), %edx
addl %edx, %eax
popl %ebp
ret
.size calcnew, .-calcnew
.ident "GCC: (Ubuntu 4.3.3-5ubuntu4) 4.3.3"
.section .note.GNU-stack,"",#progbits
I want to remove all leal and imull operations in this assembly code and replace their functionality with only sall addl and subl operations. Here is my attempt:
.file "calcnew.c"
.text
.globl calcnew
.type calcnew, #function
calcnew:
pushl %ebp
movl %esp, %ebp
movl 8(%ebp), %edx
movl 12(%ebp), %ecx
sall $3, %ecx
movl %ecx, %eax
;leal 0(,%ecx,8), %eax
subl %ecx, %eax
movl %edx, %ecx
sall $1, %edx
addl %ecx, %edx
;leal (%edx,%edx,2), %edx
addl %edx, %eax
movl 16(%ebp), %edx
movl %edx, %ecx
sall $4, %edx
sall $1, %ecx
subl %ecx, %edx
;imull $14, 16(%ebp), %edx
addl %edx, %eax
popl %ebp
ret
.size calcnew, .-calcnew
.ident "GCC: (Ubuntu 4.3.3-5ubuntu4) 4.3.3"
.section .note.GNU-stack,"",#progbits
The output when compiling my c code with the new assembly file should be the same as compiling with the original assembly file (using leal and mull operations), however, my output is wrong. What did I do wrong?
Here is the C code calling the assembler file:
#include <stdio.h>
int calcnew(int x, int y, int z);
int main()
{
int x = 2;
int y = 6;
int z = 11;
int result;
result = calcnew(x,y,z);
printf("x=%d, y=%d, z=%d, result=%d\n",x,y,z,result);
}

Answer 1

You replace
leal 0(,%ecx,8), %eax
With
sall $3, %ecx
movl %ecx, %eax
But this clobbers the value of ecx, which is live out of those instructions. Instead:
movl %ecx, %eax
sall $3, %eax