> > And generally the one proposing uglification-for-optimization should
> > provide
> > the evidence. :-)
>
> When it comes to gcc, past history is my evidence until proven otherwise :)
> Maybe I will check again ...
OK then:
static inline void mb(void)
{
__asm__ __volatile__ ("sync" : : : "memory");
}
static inline void dcbf(void *addr)
{
__asm__ __volatile__ ("dcbf 0, %0" : : "r"(addr) : "memory");
}
#define L1_CACHE_SHIFT 5
#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
void flush_dcache_range(unsigned long start, unsigned long stop)
{
void *addr = (void *)(start & ~(L1_CACHE_BYTES - 1));
unsigned int size = stop - (unsigned long)addr + (L1_CACHE_BYTES - 1);
unsigned int i;
for (i = 0; i < size >> L1_CACHE_SHIFT; i++, addr += L1_CACHE_BYTES)
dcbf(addr);
if (i)
mb(); /* sync */
}
gives:
flush_dcache_range:
stwu %r1,-16(%r1)
rlwinm %r3,%r3,0,0,26
addi %r4,%r4,31
subf %r9,%r3,%r4
srwi. %r10,%r9,5
beq %cr0,.L1
mtctr %r10
.p2align 4,,15
.L4:
#APP
# 8 "gccloop.c" 1
dcbf 0, %r3
# 0 "" 2
#NO_APP
addi %r3,%r3,32
bdnz .L4
#APP
# 3 "gccloop.c" 1
sync
# 0 "" 2
#NO_APP
.L1:
addi %r1,%r1,16
blr
good enough :)
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