[PATCH] Fix PR tree-optimization/71179

[PATCH] Fix PR tree-optimization/71179

[Kugan Vivekanandarajah]

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Hi,

We don’t allow vector type for integer. Likewise I am also disallowing
the floating point vector type in transforming repeated addition to
multiplication.

This can be relaxed. I will send a separate patch to allow integer and
floating point vectorization later.

Bootstrapped and regression tested on x86-64-linux-gnu with no new regressions.

Is this OK for trunk?

Thanks,
Kugan

gcc/testsuite/ChangeLog:

2016-05-20  Kugan Vivekanandarajah  <kugan.vivekanandarajah@linaro.org>

    * gcc.dg/tree-ssa/pr71179.c: New test.

gcc/ChangeLog:

2016-05-20  Kugan Vivekanandarajah  <kugan.vivekanandarajah@linaro.org>

    * tree-ssa-reassoc.c (transform_add_to_multiply): Disallow float
VECTOR type.

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diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr71179.c b/gcc/testsuite/gcc.dg/tree-ssa/pr71179.c
index e69de29..885c643 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/pr71179.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr71179.c
@@ -0,0 +1,10 @@
+
+/* { dg-do compile } */
+/* { dg-options "-O3 -ffast-math" } */
+
+typedef float __m128 __attribute__ ((__vector_size__ (16), __may_alias__));
+
+__m128 foo (__m128 a)
+{
+  return a + a;
+}
diff --git a/gcc/tree-ssa-reassoc.c b/gcc/tree-ssa-reassoc.c
index 3b5f36b..0c25a8c 100644
--- a/gcc/tree-ssa-reassoc.c
+++ b/gcc/tree-ssa-reassoc.c
@@ -1769,7 +1769,8 @@ transform_add_to_multiply (gimple *stmt, vec<operand_entry *> *ops)
   bool changed = false;
 
   if (!INTEGRAL_TYPE_P (TREE_TYPE ((*ops)[0]->op))
-      && !flag_unsafe_math_optimizations)
+      && (!SCALAR_FLOAT_TYPE_P (TREE_TYPE ((*ops)[0]->op))
+	  || !flag_unsafe_math_optimizations))
     return false;
 
   /* Look for repeated operands.  */

Re: [PATCH] Fix PR tree-optimization/71179

[Richard Biener]

On Fri, May 20, 2016 at 4:13 AM, Kugan Vivekanandarajah
<kugan.vivekanandarajah@linaro.org> wrote:
> Hi,
>
> We don’t allow vector type for integer. Likewise I am also disallowing
> the floating point vector type in transforming repeated addition to
> multiplication.
>
> This can be relaxed. I will send a separate patch to allow integer and
> floating point vectorization later.
>
> Bootstrapped and regression tested on x86-64-linux-gnu with no new regressions.
>
> Is this OK for trunk?

Ok.

Thanks,
Richard.

> Thanks,
> Kugan
>
> gcc/testsuite/ChangeLog:
>
> 2016-05-20  Kugan Vivekanandarajah  <kugan.vivekanandarajah@linaro.org>
>
>     * gcc.dg/tree-ssa/pr71179.c: New test.
>
> gcc/ChangeLog:
>
> 2016-05-20  Kugan Vivekanandarajah  <kugan.vivekanandarajah@linaro.org>
>
>     * tree-ssa-reassoc.c (transform_add_to_multiply): Disallow float
> VECTOR type.