From: Richard Biener <rguenther@suse.de>
Date: Wed, 11 Aug 2021 12:10:52 +0000 (+0200)
Subject: target/101788 - avoid decomposing hard-register "loads"
X-Git-Tag: upstream/12.2.0~5843
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2cb02e065ff015a69db918eb545a00cd6edf0194;p=platform%2Fupstream%2Fgcc.git

target/101788 - avoid decomposing hard-register "loads"

This avoids decomposing hard-register accesses that masquerade as
loads.

2021-08-11  Richard Biener  <rguenther@suse.de>

	PR target/101877
	* tree-ssa-forwprop.c (pass_forwprop::execute): Do not decompose
	hard-register accesses.
---

diff --git a/gcc/tree-ssa-forwprop.c b/gcc/tree-ssa-forwprop.c
index bd64b8e..5b30d4c 100644
--- a/gcc/tree-ssa-forwprop.c
+++ b/gcc/tree-ssa-forwprop.c
@@ -3190,7 +3190,8 @@ pass_forwprop::execute (function *fun)
 		       || (fun->curr_properties & PROP_gimple_lvec))
 		   && gimple_assign_load_p (stmt)
 		   && !gimple_has_volatile_ops (stmt)
-		   && !stmt_can_throw_internal (cfun, stmt))
+		   && !stmt_can_throw_internal (cfun, stmt)
+		   && (!VAR_P (rhs) || !DECL_HARD_REGISTER (rhs)))
 	    optimize_vector_load (&gsi);
 
 	  else if (code == COMPLEX_EXPR)