Dear all, I am using the Keil 5.23 and running simulation for the STM32F103ZE
I am using optimization Level 0 (-O0)
In C, I have declared two variables i j i = 0x12345678 j = 0x87654321
then I have 2 instructions in C
dummy = i + j;
dummy = i - j;
When I switch to Disassembly and looking to the disassembly code,
the register value
R2 = 0x12345678; R3 = 0x87654321; before executing the ADD r2,r2,r3 the XPSR shows
N = 1, Z = 0, C = 1, V = 0, Q = 0, T = 1; After the ADD instruction, results remains the same.. However, from the addition, there should be NO Carry after the addition, why the status of the xPSR not updated ?
It would be grateful if I can get any help on that.. Thanks, Yours FOX
Dear Hans-Bernhard Broeker,
Thanks for your statement of the job of the compiler and that would be informative to me.
Like a compiler, it is free for you to think if I am not appreciating the other's work, however, I truly appreciate all the information I got from here.
Thanks, Yours WU, Chi Hang