From: Richard Sandiford <richard.sandiford@arm.com>
Date: Mon, 6 Nov 2023 10:49:59 +0000 (+0000)
Subject: explow: Avoid unnecessary alignment operations
X-Git-Tag: basepoints/gcc-15~4989
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=89abbaa5fb3823601710394683cf2e2101aba66a;p=thirdparty%2Fgcc.git

explow: Avoid unnecessary alignment operations

align_dynamic_address would output alignment operations even
for a required alignment of 1 byte.

gcc/
	* explow.cc (align_dynamic_address): Do nothing if the required
	alignment is a byte.
---

diff --git a/gcc/explow.cc b/gcc/explow.cc
index aa64d5e906cf..0be6d2629c9d 100644
--- a/gcc/explow.cc
+++ b/gcc/explow.cc
@@ -1201,6 +1201,9 @@ record_new_stack_level (void)
 rtx
 align_dynamic_address (rtx target, unsigned required_align)
 {
+  if (required_align == BITS_PER_UNIT)
+    return target;
+
   /* CEIL_DIV_EXPR needs to worry about the addition overflowing,
      but we know it can't.  So add ourselves and then do
      TRUNC_DIV_EXPR.  */