From: Vladimir N. Makarov <vmakarov@redhat.com>
Date: Wed, 29 Apr 2026 12:50:32 +0000 (-0400)
Subject: [LRA]: Fix a bug in finding conflicts in rematerialization
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fb3b31e0cbdd779b3687b25334aa6a3766aec3f3;p=thirdparty%2Fgcc.git

[LRA]: Fix a bug in finding conflicts in rematerialization

In LRA rematerialization wrong mode is used to find register conflicts. It
can result in wrong rematerialization. The patch fixes this.

gcc/ChangeLog:

	* lra-remat.cc (reg_overlap_for_remat_p): Use the right mode for
	regno2.
---

diff --git a/gcc/lra-remat.cc b/gcc/lra-remat.cc
index c7ae0f7b8c1..c4da3f75e59 100644
--- a/gcc/lra-remat.cc
+++ b/gcc/lra-remat.cc
@@ -697,7 +697,7 @@ reg_overlap_for_remat_p (lra_insn_reg *reg, rtx_insn *insn)
 	if (regno2 >= FIRST_PSEUDO_REGISTER)
 	  nregs2 = 1;
 	else
-	  nregs2 = hard_regno_nregs (regno2, reg->biggest_mode);
+	  nregs2 = hard_regno_nregs (regno2, reg2->biggest_mode);
 
 	if ((regno2 + nregs2 - 1 >= regno && regno2 < regno + nregs)
 	    || (regno + nregs - 1 >= regno2 && regno < regno2 + nregs2))