From 25725506b85f478076770942d76799c54310c696 Mon Sep 17 00:00:00 2001
From: "Vladimir N. Makarov" <vmakarov@redhat.com>
Date: Fri, 25 Mar 2022 12:22:08 -0400
Subject: [PATCH] [PR104971] LRA: check live hard regs to remove a dead insn

LRA removes insn modifying sp for given PR test set.  We should also have
checked living hard regs to prevent this.  The patch fixes this.

gcc/ChangeLog:

	PR middle-end/104971
	* lra-lives.cc (process_bb_lives): Check hard_regs_live for hard
	regs to clear remove_p flag.
---
 gcc/lra-lives.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gcc/lra-lives.cc b/gcc/lra-lives.cc
index 796f00629b4..a755464ee81 100644
--- a/gcc/lra-lives.cc
+++ b/gcc/lra-lives.cc
@@ -724,7 +724,10 @@ process_bb_lives (basic_block bb, int &curr_point, bool dead_insn_p)
 	  bool remove_p = true;
 
 	  for (reg = curr_id->regs; reg != NULL; reg = reg->next)
-	    if (reg->type != OP_IN && sparseset_bit_p (pseudos_live, reg->regno))
+	    if (reg->type != OP_IN
+		&& (reg->regno < FIRST_PSEUDO_REGISTER
+		    ? TEST_HARD_REG_BIT (hard_regs_live, reg->regno)
+		    : sparseset_bit_p (pseudos_live, reg->regno)))
 	      {
 		remove_p = false;
 		break;