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https://bugs.gentoo.org/657060
https://gcc.gnu.org/PR86871
From c69949a7ec14a363128cd1445c7153e1ce051eb7 Mon Sep 17 00:00:00 2001
From: rsandifo <rsandifo@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue, 14 Aug 2018 09:24:45 +0000
Subject: [PATCH] Fix invalid assumption in vect_transform_stmt (PR 86871)
The handling of outer-loop uses of inner-loop definitions assumed
that anything that wasn't a PHI would be a gassign. It's also
possible for it to be a gcall.
2018-08-14 Richard Sandiford <richard.sandiford@arm.com>
gcc/
Backport from mainline
2018-08-09 Richard Sandiford <richard.sandiford@arm.com>
PR tree-optimization/86871
* tree-vect-stmts.c (vect_transform_stmt): Use gimple_get_lhs
instead of gimple_assign_lhs.
gcc/testsuite/
Backport from mainline
2018-08-09 Richard Sandiford <richard.sandiford@arm.com>
PR tree-optimization/86871
* gcc.dg/vect/pr86871.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-8-branch@263528 138bc75d-0d04-0410-961f-82ee72b054a4
---
gcc/testsuite/gcc.dg/vect/pr86871.c | 15 +++++++++++++++
gcc/tree-vect-stmts.c | 2 +-
4 files changed, 33 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.dg/vect/pr86871.c
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/pr86871.c
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+
+extern int b[];
+extern int c[];
+void g(int f) {
+ for (; f; f++) {
+ int d = 0;
+ for (int e = -1; e <= 1; e++) {
+ int a = f + e;
+ if (a)
+ d = *(c + a);
+ }
+ *(b + f) = d;
+ }
+ }
--- a/gcc/tree-vect-stmts.c
+++ b/gcc/tree-vect-stmts.c
@@ -9602,7 +9602,7 @@ vect_transform_stmt (gimple *stmt, gimple_stmt_iterator *gsi,
if (gimple_code (stmt) == GIMPLE_PHI)
scalar_dest = PHI_RESULT (stmt);
else
- scalar_dest = gimple_assign_lhs (stmt);
+ scalar_dest = gimple_get_lhs (stmt);
FOR_EACH_IMM_USE_FAST (use_p, imm_iter, scalar_dest)
{
--
2.20.1
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