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.
---
gcc/config/xtensa/xtensa.md | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md
index 6f5cbc541d8..217879bde15 100644
--- a/gcc/config/xtensa/xtensa.md
+++ b/gcc/config/xtensa/xtensa.md
@@ -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" "")))]
--
2.20.1
