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@@ -0,0 +1,37 @@
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+From b9a7775674d91c7af8043a83211ffeaa576327d7 Mon Sep 17 00:00:00 2001
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+From: Max Filippov <jcmvbkbc@gmail.com>
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+Date: Fri, 10 Apr 2015 17:46:30 +0300
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+Subject: [PATCH] Fix PR target/65730
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+
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+2015-05-20 Max Filippov <jcmvbkbc@gmail.com>
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+gcc/
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+ * config/xtensa/xtensa.c (init_alignment_context): Replace MULT
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+ by BITS_PER_UNIT with ASHIFT by exact_log2 (BITS_PER_UNIT).
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+
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+Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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+---
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+Backported from: svn+ssh://gcc.gnu.org/svn/gcc/trunk@223452
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+Changes to ChangeLog are dropped.
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+
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+ gcc/config/xtensa/xtensa.c | 5 +++--
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+ 1 file changed, 3 insertions(+), 2 deletions(-)
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+
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+diff --git a/gcc/config/xtensa/xtensa.c b/gcc/config/xtensa/xtensa.c
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+index eb039ba..7296e36 100644
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+--- a/gcc/config/xtensa/xtensa.c
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++++ b/gcc/config/xtensa/xtensa.c
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+@@ -1461,8 +1461,9 @@ init_alignment_context (struct alignment_context *ac, rtx mem)
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+ if (ac->shift != NULL_RTX)
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+ {
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+ /* Shift is the byte count, but we need the bitcount. */
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+- ac->shift = expand_simple_binop (SImode, MULT, ac->shift,
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+- GEN_INT (BITS_PER_UNIT),
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++ gcc_assert (exact_log2 (BITS_PER_UNIT) >= 0);
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++ ac->shift = expand_simple_binop (SImode, ASHIFT, ac->shift,
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++ GEN_INT (exact_log2 (BITS_PER_UNIT)),
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+ NULL_RTX, 1, OPTAB_DIRECT);
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+ ac->modemask = expand_simple_binop (SImode, ASHIFT,
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+ GEN_INT (GET_MODE_MASK (mode)),
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+--
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+1.8.1.4
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+
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Max Filippov