[gcc(refs/users/meissner/heads/work119)] Fold V8HI vsx_extract from memory with variable element with sign/zero extension.

[Michael Meissner <meissner@gcc.gnu.org>]

https://gcc.gnu.org/g:20e689a11e7415ff9bfca4f098fdf20fd8d4bd0d

commit 20e689a11e7415ff9bfca4f098fdf20fd8d4bd0d
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Sat Apr 22 02:08:07 2023 -0400

    Fold V8HI vsx_extract from memory with variable element with sign/zero extension.
    
    This patch folds V8HI vsx_extract from memory where the element number is
    variable with sign or zero extension to SImode/DImode.
    
    2023-04-22   Michael Meissner  <meissner@linux.ibm.com>
    
    gcc/
    
            * config/rs6000/vsx.md (vsx_extract_v8hi_load_to_<su><mode>): New insn.

Diff:
---
 gcc/config/rs6000/vsx.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/gcc/config/rs6000/vsx.md b/gcc/config/rs6000/vsx.md
index 5031801f71b..5e27e4389b0 100644
--- a/gcc/config/rs6000/vsx.md
+++ b/gcc/config/rs6000/vsx.md
@@ -4121,6 +4121,27 @@
   [(set_attr "type" "load,fpload")
    (set_attr "isa" "*,p8v")])
 
+;; Extract a V8HI element from memory with a variable element number and sign
+;; or zero extend it to either SImode or DImode.
+(define_insn_and_split "*vsx_extract_v8hi_var_load_to_<su><mode>"
+  [(set (match_operand:GPR 0 "gpc_reg_operand" "=r")
+	(any_extend:GPR
+	 (unspec:SI
+	  [(match_operand:V8HI 1 "memory_operand" "Q")
+	   (match_operand:DI 2 "gpc_reg_operand" "r")]
+	  UNSPEC_VSX_EXTRACT)))
+   (clobber (match_scratch:DI 3 "=&b"))]
+  "VECTOR_MEM_VSX_P (V8HImode) && TARGET_DIRECT_MOVE_64BIT"
+  "#"
+  "&& reload_completed"
+  [(set (match_dup 0)
+	(any_extend:GPR (match_dup 4)))]
+{
+  operands[4] = rs6000_adjust_vec_address (operands[0], operands[1], operands[2],
+					   operands[3], HImode);
+}
+  [(set_attr "type" "load")])
+
 ;; ISA 3.1 extract
 (define_expand "vextractl<mode>"
   [(set (match_operand:V2DI 0 "altivec_register_operand")