Alpha: Adjust MEM alignment for block clear [PR115459]

maciej-w-rozycki · maciej-w-rozycki · commit 2984a3fac3d6 · 2024-12-25T22:23:40.000Z
By inference it appears to me that the same fix for PR target/115459 needs to be applied to the block clear operation that has been done for block move, as implemented by commit ccfe715 ("[alpha] adjust MEM alignment for block move [PR115459]"). gcc/ PR target/115459 * config/alpha/alpha.cc (alpha_expand_block_clear): Adjust MEM to match inferred alignment.
diff --git a/gcc/config/alpha/alpha.cc b/gcc/config/alpha/alpha.cc
@@ -4076,6 +4076,12 @@ alpha_expand_block_clear (rtx operands[])
           else if (a >= 16)
 	    align = a, alignofs = 2 - c % 2;
 	}
+
+      if (MEM_P (orig_dst) && MEM_ALIGN (orig_dst) < align)
+	{
+	  orig_dst = shallow_copy_rtx (orig_dst);
+	  set_mem_align (orig_dst, align);
+	}
     }
 
   /* Handle an unaligned prefix first.  */

Original file line number	Diff line number	Diff line change
`@@ -4076,6 +4076,12 @@ alpha_expand_block_clear (rtx operands[])`
`4076`	`4076`	`else if (a >= 16)`
`4077`	`4077`	`align = a, alignofs = 2 - c % 2;`
`4078`	`4078`	`}`
	`4079`	`+`
	`4080`	`+ if (MEM_P (orig_dst) && MEM_ALIGN (orig_dst) < align)`
	`4081`	`+ {`
	`4082`	`+ orig_dst = shallow_copy_rtx (orig_dst);`
	`4083`	`+ set_mem_align (orig_dst, align);`
	`4084`	`+ }`
`4079`	`4085`	`}`
`4080`	`4086`
`4081`	`4087`	`/* Handle an unaligned prefix first. */`