From: Maciej W. Rozycki <macro@orcam.me.uk>
Date: Wed, 25 Dec 2024 22:23:40 +0000 (+0000)
Subject: Alpha: Adjust MEM alignment for block clear [PR115459]
X-Git-Tag: basepoints/gcc-16~3115
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=2984a3fac3d6b98e2cd6d7ee1c701159be86af78;p=thirdparty%2Fgcc.git

Alpha: Adjust MEM alignment for block clear [PR115459]

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 ccfe71518039 ("[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
index 58da4a886321..7c28743f2ee3 100644
--- 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.  */