Hi.
As mentioned in the PR, gimple nops are wrongly handled in is_maybe_undefined
function.
Patch can bootstrap on ppc64le-redhat-linux and survives regression tests.
Ready to be installed?
Martin
>From 54b98e2d035f92ec20bf7b548f90b1d00c4c597b Mon Sep 17 00:00:00 2001
From: marxin <mli...@suse.cz>
Date: Wed, 15 Feb 2017 13:46:38 +0100
Subject: [PATCH] Handle GIMPLE NOPs in is_maybe_undefined (PR
tree-optimization/79529).
gcc/ChangeLog:
2017-02-15 Martin Liska <mli...@suse.cz>
PR tree-optimization/79529
* tree-ssa-loop-unswitch.c (is_maybe_undefined): Bail out when
spotting a gimple NOP.
---
gcc/tree-ssa-loop-unswitch.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/gcc/tree-ssa-loop-unswitch.c b/gcc/tree-ssa-loop-unswitch.c
index 4ef3a6bf80a..a52e4719bec 100644
--- a/gcc/tree-ssa-loop-unswitch.c
+++ b/gcc/tree-ssa-loop-unswitch.c
@@ -141,6 +141,9 @@ is_maybe_undefined (const tree name, gimple *stmt, struct loop *loop)
gimple *def = SSA_NAME_DEF_STMT (t);
+ if (!def || gimple_nop_p (def))
+ return true;
+
/* Check that all the PHI args are fully defined. */
if (gphi *phi = dyn_cast <gphi *> (def))
{
--
2.11.0
