>So the optimiser will never coalesce
>
>LDR R0, [R2,#4]
>LDR R1, [R2,#8]
>
>into
>
>LDMIB R2, {R0,R1}
>
>?
Oops, you're right. Try this with -O2:
struct {
int pad;
int a;
int b;
} foo;
bar()
{
baz(foo.a, foo.b);
}
-- I get:
bar:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, current_function_anonymous_args = 0
mov ip, sp
stmfd sp!, {fp, ip, lr, pc}
ldr r3, .L2
ldmib r3, {r0, r1} @ phole ldm
sub fp, ip, #4
bl baz
ldmea fp, {fp, sp, pc}
I guess I ought to check what the exact conditions that trigger the bug are.
Is the errata available online?
p.
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