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xtensa: Implement bswaphi2 insn pattern

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This patch adds bswaphi2 insn pattern that is one instruction less than the
default expansion.

gcc/ChangeLog:

	* config/xtensa/xtensa.md (bswaphi2): New insn pattern.
This commit is contained in:
Takayuki 'January June' Suwa 2022-05-29 19:44:32 +09:00 • committed by Max Filippov
parent 6458486345
commit 2fcc69d8ce
1 changed files with 10 additions and 0 deletions
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10
gcc/config/xtensa/xtensa.md
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@ -471,6 +471,16 @@
;; Byte swap.
(define_insn "bswaphi2"
[(set (match_operand:HI 0 "register_operand" "=a")
(bswap:HI (match_operand:HI 1 "register_operand" "r")))
(clobber (match_scratch:HI 2 "=&a"))]
""
"extui\t%2, %1, 8, 8\;slli\t%0, %1, 8\;or\t%0, %0, %2"
[(set_attr "type" "arith")
(set_attr "mode" "HI")
(set_attr "length" "9")])
(define_expand "bswapsi2"
[(set (match_operand:SI 0 "register_operand" "")
(bswap:SI (match_operand:SI 1 "register_operand" "")))]