[gcc r16-272] i386: Skip sub-RTXes of memory operand in ix86_update_stack_alignment

[Uros Bizjak via Gcc-cvs]

https://gcc.gnu.org/g:1547c0a5a46a9730547c36b6e8fccc0a25123f1a

commit r16-272-g1547c0a5a46a9730547c36b6e8fccc0a25123f1a
Author: Uros Bizjak <ubiz...@gmail.com>
Date:   Tue Apr 29 08:28:37 2025 +0200

    i386: Skip sub-RTXes of memory operand in ix86_update_stack_alignment
    
    Skip sub-RTXes of the memory operand if stack access register is
    not mentioned in the operand.
    
    gcc/ChangeLog:
    
            * config/i386/i386.cc (ix86_update_stack_alignment): Skip sub-RTXes
            of the memory operand if stack access register is not mentioned in
            the operand.

Diff:
---
 gcc/config/i386/i386.cc | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index ae2386785afa..bfd9cac215ad 100644
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -8495,13 +8495,18 @@ ix86_update_stack_alignment (rtx, const_rtx pat, void 
*data)
   FOR_EACH_SUBRTX (iter, array, pat, ALL)
     {
       auto op = *iter;
-      if (MEM_P (op) && reg_mentioned_p (p->reg, op))
+      if (MEM_P (op))
        {
-         unsigned int alignment = MEM_ALIGN (op);
+         if (reg_mentioned_p (p->reg, XEXP (op, 0)))
+           {
+             unsigned int alignment = MEM_ALIGN (op);
 
-         if (alignment > *p->stack_alignment)
-           *p->stack_alignment = alignment;
-         break;
+             if (alignment > *p->stack_alignment)
+               *p->stack_alignment = alignment;
+             break;
+           }
+         else
+           iter.skip_subrtxes ();
        }
     }
 }