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9eba97e412
The previous patch introduced the target-specific named address space
"__force_l32", but this reserved identifier can only be used from C.
Therefore, this patch introduces a new target-specific attribute
"force_l32," which is very similar to the named address space "__force_l32,"
making that feature usable not only in C but also in other languages.
/* example */
extern "C" {
unsigned int test(const char *p) {
for (const char __attribute__((force_l32)) *q = p; ; ++q)
if (!*q)
return q - p;
}
}
;; result (-Os -mlittle-endian)
test:
entry sp, 32
mov.n a8, a2
movi.n a10, -4
.L3:
and a9, a8, a10 ;; *q : align to SImode
l32i.n a9, a9, 0 ;; *q : load:SI
ssa8l a8 ;; *q : shift to bit position 0
srl a9, a9
extui a9, a9, 0, 8 :: *q : zero_extract:QI
beqz.n a9, .L5
addi.n a8, a8, 1
j .L3
.L5:
sub a2, a8, a2
retw.n
gcc/ChangeLog:
* config/xtensa/xtensa.cc (xtensa_attribute_table,
TARGET_ATTRIBUTE_TABLE):
New definitions for target-specific attributes.
(xtensa_expand_load_force_l32_1): New sub-function for inspecting
the attribute from the specified MEM rtx.
(xtensa_expand_load_force_l32): Add handlings for for addresses
with offsets.
(xtensa_handle_force_l32_attribute_1,
xtensa_handle_force_l32_attribute):
New functions for handling the attribute.
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