Qt Creator Assembly Output - LEA instruction [duplicate]

This question already has answers here: 开发者_如何学Python What's the purpose of the LEA instruction? (17 answers) Closed 7 years ago.

Qt shows me assembler (x86) command this way:

lea    (%edx,%eax,1),%ecx

What does it means? I can't find description of this instruction that fits.

UPD

Thanks. So, am i correct?

0) movl $0x0,-0x14(%ebp)

1) mov -0x14(%ebp),%eax

2) inc %eax

3) mov %eax,-0x14(%ebp)

4) mov -0x14(%ebp),%eax

5) inc %eax

6) mov %eax,-0x14(%ebp)

7) mov -0x14(%ebp),%edx

8) mov -0x14(%ebp),%eax

9) lea (%edx,%eax,1),%ecx

10) mov %ecx,-0x14(%ebp)

11) inc %edx

12) mov %edx,-0x14(%ebp)

13) inc %eax

14) mov %eax,-0x14(%ebp)

Makes this("i" is "-0x14(%ebp)"):

0) i=0

1) eax=0

2) eax=1

3) i=1

4) eax=1

5) eax=2

6) i=2

7) edx=2

8) eax=2

9) ecx=2; ecx=4

10) i=4

11) edx=3

12) i=3

13) eax=3

14) i=3

---

LEA stands for Load Effective Address. It's used to perform an address computation, but then rather than accessing the value at that address it stores the computed address in the destination register.

In this case, it's storing the value of EDX + (EAX * 1) into ECX. This is an alternative to the two-instruction sequence

movl %edx, %ecx
addl %eax, %ecx