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Fix PR tree-optimization/77654

Message ID F007E4D1AE275F468C186A52E051529CE45644F4@BADAG02.ba.imgtec.org
State New
Headers show

Commit Message

Doug Gilmore Sept. 20, 2016, 9:27 p.m. UTC 
Add missing attachment.

Doug

gcc/
        PR tree-optimization/77654
        * tree-ssa-alias.c (issue_prefetch_ref): Add call
        to duplicate_ssa_name_ptr_info.
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Patch

From ec9069b7b7b07d5fda9c04aaa9b385fba89a6e16 Mon Sep 17 00:00:00 2001
From: Doug Gilmore <doug.gilmore@imgtec.com>
Date: Tue, 6 Sep 2016 10:18:42 -0700
Subject: [PATCH 2/2] Ensure points-to information is maintained for prefetch
 addresses.

---
 gcc/tree-ssa-loop-prefetch.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/gcc/tree-ssa-loop-prefetch.c b/gcc/tree-ssa-loop-prefetch.c
index 26cf0a0..10ade186 100644
--- a/gcc/tree-ssa-loop-prefetch.c
+++ b/gcc/tree-ssa-loop-prefetch.c
@@ -39,6 +39,7 @@  along with GCC; see the file COPYING3.  If not see
 #include "tree-ssa-loop-manip.h"
 #include "tree-ssa-loop-niter.h"
 #include "tree-ssa-loop.h"
+#include "ssa.h"
 #include "tree-into-ssa.h"
 #include "cfgloop.h"
 #include "tree-scalar-evolution.h"
@@ -1160,6 +1161,16 @@  issue_prefetch_ref (struct mem_ref *ref, unsigned unroll_factor, unsigned ahead)
           addr = force_gimple_operand_gsi (&bsi, unshare_expr (addr), true,
 					   NULL, true, GSI_SAME_STMT);
       }
+
+      if (POINTER_TYPE_P (TREE_TYPE (addr_base)))
+	{
+	  duplicate_ssa_name_ptr_info (addr, SSA_NAME_PTR_INFO (addr_base));
+	  /* As this isn't a plain copy we have to reset alignment
+	     information.  */
+	  if (SSA_NAME_PTR_INFO (addr))
+	    mark_ptr_info_alignment_unknown (SSA_NAME_PTR_INFO (addr));
+	}
+
       /* Create the prefetch instruction.  */
       prefetch = gimple_build_call (builtin_decl_explicit (BUILT_IN_PREFETCH),
 				    3, addr, write_p, local);
-- 
1.7.9.5