diff options
| author | jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4> | 2013-01-03 09:05:43 +0000 |
|---|---|---|
| committer | jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4> | 2013-01-03 09:05:43 +0000 |
| commit | e4bef2715caaca8c1918f900bd95aff5b0d74c9a (patch) | |
| tree | bf717bd5e0292f0afa63db0a241a01e20f3d4a9e /gcc/loop-iv.c | |
| parent | d871c5dca71fedee4b728ebe624b165205bca076 (diff) | |
PR rtl-optimization/55838
* loop-iv.c (iv_number_of_iterations): Call lowpart_subreg on
iv0.step, iv1.step and step.
* gcc.dg/pr55838.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@194837 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/loop-iv.c')
| -rw-r--r-- | gcc/loop-iv.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/gcc/loop-iv.c b/gcc/loop-iv.c index 50b75362a97..d089fbf7cea 100644 --- a/gcc/loop-iv.c +++ b/gcc/loop-iv.c @@ -1,5 +1,5 @@ /* Rtl-level induction variable analysis. - Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 + Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Free Software Foundation, Inc. This file is part of GCC. @@ -2406,6 +2406,9 @@ iv_number_of_iterations (struct loop *loop, rtx insn, rtx condition, iv1.step = const0_rtx; } + iv0.step = lowpart_subreg (mode, iv0.step, comp_mode); + iv1.step = lowpart_subreg (mode, iv1.step, comp_mode); + /* This is either infinite loop or the one that ends immediately, depending on initial values. Unswitching should remove this kind of conditions. */ if (iv0.step == const0_rtx && iv1.step == const0_rtx) @@ -2516,6 +2519,7 @@ iv_number_of_iterations (struct loop *loop, rtx insn, rtx condition, step = simplify_gen_unary (NEG, comp_mode, iv1.step, comp_mode); else step = iv0.step; + step = lowpart_subreg (mode, step, comp_mode); delta = simplify_gen_binary (MINUS, comp_mode, iv1.base, iv0.base); delta = lowpart_subreg (mode, delta, comp_mode); delta = simplify_gen_binary (UMOD, mode, delta, step); |