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From: "vincenzo.innocente at cern dot ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/52969] [4.7/4.8 Regression] ICE in in get_expr_operands, at tree-ssa-operands.c:1035 with -ftree-loop-if-convert-stores
Date: Fri, 13 Apr 2012 13:04:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52969

--- Comment #11 from vincenzo Innocente <vincenzo.innocente at cern dot ch> 2012-04-13 13:03:48 UTC ---
I do not have a clear case in hand with evidence of "double" compare
I will have a closer look to "real life" code.

btw 
I just noticed that your test case does not vectorize even if
I rewrite as
 for (; a ; ++j) 
       xsum[j] = (cluster[j] > 0.) ? 0. : cluster[j];

any idea why?

c++ -O3 -c ifconv.cc -ftree-loop-if-convert-stores -ftree-vectorizer-verbose=9

Analyzing loop at ifconv.cc:10

10: ===== analyze_loop_nest =====
10: === vect_analyze_loop_form ===
10: not vectorized: control flow in loop.
10: bad loop form.
ifconv.cc:3: note: vectorized 0 loops in function.
pb-d-128-141-131-26:bugs48 innocent$ c++ -O3 -c ifconv.cc
-ftree-loop-if-convert-stores -ftree-vectorizer-verbose=9

Analyzing loop at ifconv.cc:10

10: ===== analyze_loop_nest =====
10: === vect_analyze_loop_form ===
10: not vectorized: control flow in loop.
10: bad loop form.
ifconv.cc:3: note: vectorized 0 loops in function.
pb-d-128-141-131-26:bugs48 innocent$ c++ -Ofast -c ifconv.cc
-ftree-loop-if-convert-stores -ftree-vectorizer-verbose=9

Analyzing loop at ifconv.cc:10

10: ===== analyze_loop_nest =====
10: === vect_analyze_loop_form ===
10: not vectorized: multiple exits.
10: bad loop form.
ifconv.cc:3: note: vectorized 0 loops in function.
pb-d-128-141-131-26:bugs48 innocent$ c++ -Ofast -c ifconv.cc 
-ftree-vectorizer-verbose=9

Analyzing loop at ifconv.cc:10

10: ===== analyze_loop_nest =====
10: === vect_analyze_loop_form ===
10: not vectorized: multiple exits.
10: bad loop form.
ifconv.cc:3: note: vectorized 0 loops in function.