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Xi Ruoyao
authored
Following the instruction cost fix, we are generating
alsl.w $a0, $a0, $a0, 4
instead of
li.w $t0, 17
mul.w $a0, $t0
for "x * 4", because alsl.w is 4 times faster than mul.w. But we didn't
have a sign-extending pattern for alsl.w, causing an extra slli.w
instruction generated to sign-extend $a0. Add the pattern to remove the
redundant extension.
gcc/ChangeLog:
* config/loongarch/loongarch.md (alslsi3_extend): New
define_insn.