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In the previous patches, both the named address space "__force_l32" and
the target-specific attribute "force_l32" were introduced for reading
sub-words from the instruction memory area.
This patch introduces a new target-specific option "-mforce-l32", which
allows sub-word reading from the instruction memory area even in the
generic address spaces (ie., the default memory references) or without
the "force_l32" attribute.
/* example */
int test(unsigned int i) {
static const char string[] __attribute__((section(".irom.text")))
= "The quick brown fox jumps over the lazy dog.";
return i < __builtin_strlen(string) ? string[i] : -1;
}
;; result (-O2 -mforce-l32)
.literal_position
.literal .LC0, string$0
test:
entry sp, 32
movi.n a8, 0x2b
bltu a8, a2, .L3
l32r a9, .LC0 ;; If -mno-force-l32,
movi.n a8, -4 ;;
add.n a9, a9, a2 ;; l32r a8, .LC0
and a8, a9, a8 ;; add.n a8, a8, a2
l32i.n a8, a8, 0 ;; l8ui a2, a8, 0
ssa8l a9 ;;
srl a8, a8 ;;
extui a2, a8, 0, 8 ;;
retw.n
.L3:
movi.n a2, -1
retw.n
.section .irom.text,"a"
string$0:
.string "The quick brown fox jumps over the lazy dog."
gcc/ChangeLog:
* config/xtensa/xtensa.cc (xtensa_expand_load_force_l32_2):
New sub-function for inspecting pseudos that clearly point to the
function's stack frame.
(xtensa_expand_load_force_l32):
Add handling for loading from the generic address space when the
"-mforce-l32" option is enabled, however, obvious references to
function stack frames are excluded.
* config/xtensa/xtensa.opt (mforce-l32):
New target-specific option definition.
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