From 9632ba8160dd93107af3577334bcadfe40068e42 Mon Sep 17 00:00:00 2001 From: Xiaolin Zhao Date: Fri, 15 Aug 2025 16:19:01 +0800 Subject: cmd/compile: optimize some patterns into revb2h/revb4h instruction on loong64 Pattern1: (the type of c is uint16) c>>8 | c<<8 To: revb2h c Pattern2: (the type of c is uint32) (c & 0xff00ff00)>>8 | (c & 0x00ff00ff)<<8 To: revb2h c Pattern3: (the type of c is uint64) (c & 0xff00ff00ff00ff00)>>8 | (c & 0x00ff00ff00ff00ff)<<8 To: revb4h c Change-Id: Ic6231a3f476cbacbea4bd00e31193d107cb86cda Reviewed-on: https://go-review.googlesource.com/c/go/+/696335 Reviewed-by: Meidan Li Reviewed-by: Keith Randall Auto-Submit: Keith Randall Reviewed-by: Carlos Amedee Reviewed-by: Keith Randall LUCI-TryBot-Result: Go LUCI --- test/codegen/bitfield.go | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'test/codegen') diff --git a/test/codegen/bitfield.go b/test/codegen/bitfield.go index 44cf09f86f..6374d70650 100644 --- a/test/codegen/bitfield.go +++ b/test/codegen/bitfield.go @@ -338,20 +338,26 @@ func shift_no_cmp(x int) int { func rev16(c uint64) (uint64, uint64, uint64) { // arm64:`REV16`,-`AND`,-`LSR`,-`AND`,-`ORR\tR[0-9]+<<8` + // loong64:`REVB4H`,-`MOVV`,-`AND`,-`SRLV`,-`AND`,-`SLLV`,-`OR` b1 := ((c & 0xff00ff00ff00ff00) >> 8) | ((c & 0x00ff00ff00ff00ff) << 8) // arm64:-`ADD\tR[0-9]+<<8` + // loong64:-`ADDV` b2 := ((c & 0xff00ff00ff00ff00) >> 8) + ((c & 0x00ff00ff00ff00ff) << 8) // arm64:-`EOR\tR[0-9]+<<8` + // loong64:-`XOR` b3 := ((c & 0xff00ff00ff00ff00) >> 8) ^ ((c & 0x00ff00ff00ff00ff) << 8) return b1, b2, b3 } func rev16w(c uint32) (uint32, uint32, uint32) { // arm64:`REV16W`,-`AND`,-`UBFX`,-`AND`,-`ORR\tR[0-9]+<<8` + // loong64:`REVB2H`,-`AND`,-`SRL`,-`AND`,-`SLL`,-`OR` b1 := ((c & 0xff00ff00) >> 8) | ((c & 0x00ff00ff) << 8) // arm64:-`ADD\tR[0-9]+<<8` + // loong64:-`ADDV` b2 := ((c & 0xff00ff00) >> 8) + ((c & 0x00ff00ff) << 8) // arm64:-`EOR\tR[0-9]+<<8` + // loong64:-`XOR` b3 := ((c & 0xff00ff00) >> 8) ^ ((c & 0x00ff00ff) << 8) return b1, b2, b3 } -- cgit v1.3-6-g1900