LoongArch: extract the base address to promote the combine of RTX.

When use 256 bits vec for move src to dest, extract the base address
what plus operation to promote the combine of RTX.

gcc/ChangeLog:

	* config/loongarch/loongarch.cc: Extract plus operation.

gcc/testsuite/ChangeLog:

	* gcc.target/loongarch/vector/lasx/lasx-struct-move.c: New test.

diff --git a/gcc/config/loongarch/loongarch.cc b/gcc/config/loongarch/loongarch.cc
index d85932429d047420582a207e4bd0993d01077450..c1a53e3e7ca0f0d931222aee8cfd84df66c86704 100644 (file)
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -6087,6 +6087,16 @@ loongarch_block_move_straight (rtx dest, rtx src, HOST_WIDE_INT length,
   /* Allocate a buffer for the temporary registers.  */
   regs = XALLOCAVEC (rtx, num_reg);
 
+  /* Extract the base address what plus operation to promote the combine of
+     RTX.  */
+  if (GET_CODE (XEXP (dest, 0)) == PLUS)
+    {
+      unsigned int dest_align = MEM_ALIGN (dest);
+      rtx dest_reg = copy_addr_to_reg (XEXP (dest, 0));
+      dest = change_address (dest, BLKmode, dest_reg);
+      set_mem_align (dest, dest_align);
+    }
+
   for (delta_cur = delta, i = 0, offs = 0; offs < length; delta_cur /= 2)
     {
       mode = loongarch_mode_for_move_size (delta_cur);

diff --git a/gcc/testsuite/gcc.target/loongarch/vector/lasx/lasx-struct-move.c b/gcc/testsuite/gcc.target/loongarch/vector/lasx/lasx-struct-move.c
new file mode 100644 (file)
index 0000000..ca10e9f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/vector/lasx/lasx-struct-move.c
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -lasx" } */
+
+struct vec
+{
+  int vec_a[32];
+  double vec_b[5];
+  char vec_c[32];
+};
+
+void
+foo (struct vec *dest, struct vec *src, int index)
+{
+  dest[index] = *src;
+}
+
+/* { dg-final { scan-assembler-times "alsl\.d" 3} } */