http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54386
Mikael Pettersson <mikpe at it dot uu.se> changed:
What |Removed |Added
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CC| |mikpe at it dot uu.se
--- Comment #4 from Mikael Pettersson <mikpe at it dot uu.se> 2012-10-29
22:18:16 UTC ---
(In reply to comment #3)
> I've checked this issue again on rev 192482. It seems to be target
> independent, as it also happens on ARM.
> The following:
>
> static inline int readint (int* x)
> {
> return *x;
> }
>
> int test (int* x)
> {
> return readint (x);
> }
>
> compiles to (-O2):
>
> test:
> ldrb r3, [r0]
> ldrb r1, [r0, #1]
> ldrb r2, [r0, #2]
> orr r3, r3, r1, asl #8
> ldrb r0, [r0, #3]
> orr r3, r3, r2, asl #16
> orr r0, r3, r0, asl #24
> bx lr
I see this poor code too on armv5tel-linux-gnueabi with 4.8-20121028.
4.7 and 4.6 generate just two instructions for test: a ldr and bx.
