Takayuki 'January June' Suwa
1884f89782
This patch allows the constant synthesis to choose shorter instruction
if possible.
/* example */
int test(void) {
return 128 << 8;
}
;; before
test:
movi a2, 0x100
addmi a2, a2, 0x7f00
ret.n
;; after
test:
movi.n a2, 1
slli a2, a2, 15
ret.n
When the Code Density Option is configured, the latter is one byte smaller
than the former.
gcc/ChangeLog:
* config/xtensa/xtensa.cc (xtensa_emit_constantsynth): Remove.
(xtensa_constantsynth_2insn): Change to try all three synthetic
methods and to use the one that fits the immediate value of
the seed into a Narrow Move Immediate instruction "MOVI.N"
when the Code Density Option is configured.
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