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From b9a7775674d91c7af8043a83211ffeaa576327d7 Mon Sep 17 00:00:00 2001

From: Max Filippov <jcmvbkbc@gmail.com>

Date: Fri, 10 Apr 2015 17:46:30 +0300

Subject: [PATCH] Fix PR target/65730

​

2015-05-20  Max Filippov  <jcmvbkbc@gmail.com>

gcc/

    * config/xtensa/xtensa.c (init_alignment_context): Replace MULT

    by BITS_PER_UNIT with ASHIFT by exact_log2 (BITS_PER_UNIT).

​

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

---

Backported from: svn+ssh://gcc.gnu.org/svn/gcc/trunk@223452

Changes to ChangeLog are dropped.

​

 gcc/config/xtensa/xtensa.c | 5 +++--

 1 file changed, 3 insertions(+), 2 deletions(-)

​

diff --git a/gcc/config/xtensa/xtensa.c b/gcc/config/xtensa/xtensa.c

index eb039ba..7296e36 100644

--- a/gcc/config/xtensa/xtensa.c

+++ b/gcc/config/xtensa/xtensa.c

@@ -1461,8 +1461,9 @@ init_alignment_context (struct alignment_context *ac, rtx mem)

   if (ac->shift != NULL_RTX)

     {

       /* Shift is the byte count, but we need the bitcount.  */

-      ac->shift = expand_simple_binop (SImode, MULT, ac->shift,

-                      GEN_INT (BITS_PER_UNIT),

+      gcc_assert (exact_log2 (BITS_PER_UNIT) >= 0);

+      ac->shift = expand_simple_binop (SImode, ASHIFT, ac->shift,

+                      GEN_INT (exact_log2 (BITS_PER_UNIT)),

                       NULL_RTX, 1, OPTAB_DIRECT);

       ac->modemask = expand_simple_binop (SImode, ASHIFT,

                      GEN_INT (GET_MODE_MASK (mode)),

-- 

1.8.1.4

​