From: Georg-Johann Lay <avr@gjlay.de>
Date: Mon, 12 Aug 2024 12:39:24 +0000 (+0200)
Subject: AVR: target/85624 - Fix non-matching alignment in clrmem* insns.
X-Git-Tag: basepoints/gcc-16~6665
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=68da681e614c2750f648dac2cd0b2595999ca5d9;p=thirdparty%2Fgcc.git

AVR: target/85624 - Fix non-matching alignment in clrmem* insns.

The clrmem* patterns don't use the provided alignment information,
hence the setmemhi expander can just pass down 0 as alignment to
the clrmem* insns.

	PR target/85624
gcc/
	* config/avr/avr.md (setmemhi): Set alignment to 0.

gcc/testsuite/
	* gcc.target/avr/torture/pr85624.c: New test.
---

diff --git a/gcc/config/avr/avr.md b/gcc/config/avr/avr.md
index 84dfe4c40ec..359343e563d 100644
--- a/gcc/config/avr/avr.md
+++ b/gcc/config/avr/avr.md
@@ -1355,6 +1355,8 @@
                                     gen_int_mode (INTVAL (operands[1]), mode));
     rtx addr0 = copy_to_mode_reg (Pmode, XEXP (operands[0], 0));
     operands[0] = gen_rtx_MEM (BLKmode, addr0);
+    // Alignment is unused; just set it to 0.
+    operands[3] = const0_rtx;
   })
 
 
diff --git a/gcc/testsuite/gcc.target/avr/torture/pr85624.c b/gcc/testsuite/gcc.target/avr/torture/pr85624.c
new file mode 100644
index 00000000000..b183d4558df
--- /dev/null
+++ b/gcc/testsuite/gcc.target/avr/torture/pr85624.c
@@ -0,0 +1,7 @@
+/* { dg-do compile } */
+
+int foo (void)
+{
+  volatile int arr[3] __attribute__((aligned(128))) = { 0 };
+  return arr[2];
+}