On Wed, Mar 7, 2012 at 9:43 PM, Conrado P. L. Gouvêa
<conrado...@gmail.com> wrote:
> Hi,
>
> I've decided to update my mspgcc and I have compiled the 20120224
> version (using Ubuntu 8.04). But I've noticed something strange, it
> appears that the compiler is generating incorrect assembly code. This
> is simple example:
>
> void foo() {
> volatile int y = 1;
> }
>
> int dummy() {
> volatile int x = 0;
> return x;
> }
>
> int main(void) {
> if (dummy() == 1) {
> foo();
> return 1;
> }
> return 0;
> }
>
>
> Compiling with " msp430-gcc -mmcu=msp430f1611 -O2 -fno-inline main.c",
> I get the following code for the main function:
>
>
> 0000403e <main>:
> 403e: b0 12 62 40 call #0x4062
> 4042: 1f 93 cmp #1, r15 ;r3 As==01
> 4044: 01 24 jz $+4 ;abs 0x4048
> 4046: 0f 43 clr r15
> 4048: b0 12 58 40 call #0x4058
> 404c: 1f 43 mov #1, r15 ;r3 As==01
>
> 0000404e <__stop_progExec__>:
>
> Notice how the second call is executed regardless if the jump is taken
> or not, which is incorrect. This causes foo() to be called even if
> dummy() does not return 1.
>
> Can anyone reproduce this issue? Is there a bug or I've messed up
> somewhere? I've just tested the Windows build and I get the same
> results.
Fixed in 20120311.
Peter
> Thanks!
> Conrado
>
> ------------------------------------------------------------------------------
> Virtualization & Cloud Management Using Capacity Planning
> Cloud computing makes use of virtualization - but cloud computing
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> http://www.accelacomm.com/jaw/sfnl/114/51521223/
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------------------------------------------------------------------------------
Virtualization & Cloud Management Using Capacity Planning
Cloud computing makes use of virtualization - but cloud computing
also focuses on allowing computing to be delivered as a service.
http://www.accelacomm.com/jaw/sfnl/114/51521223/
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