Hi,
I have being trying to persuade gcc to generate the ldp instruction without
success. I have tried many combinations, below is an example.
--- cut here ---
#define LDP(x,y,p) { \
struct vec { long x, y; } data; \
data = *(struct vec *)p; p += 2; \
x = data.x; y = data.y; \
}
long testp(long *p) {
long x, y;
LDP(x, y, p);
return x+y;
}
--- cut here ---
$ gcc --version
gcc (GCC) 4.9.1
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ gcc -S -O3 ldp.c
$ cat ldp.s
.cpu generic+fp+simd
.file "ldp.c"
.text
.align 2
.global testp
.type testp, %function
testp:
ldr x1, [x0,8] ;; why not ldp?????
ldr x0, [x0]
add x0, x1, x0
ret
.size testp, .-testp
.ident "GCC: (GNU) 4.9.1"
What can I do do make it generate ldp?
Ed.
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