From: Richard Sandiford <richard.sandiford@arm.com>
Date: Wed, 18 Nov 2020 18:40:30 +0000 (+0000)
Subject: testsuite: Fix vect/vect-sdiv-pow2-1.c
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0f545ad9b68445094975455a5657bfc8be2e4912;p=gcc.git

testsuite: Fix vect/vect-sdiv-pow2-1.c

We're now able to vectorise the set-up loop:

      int p = power2 (fns[i].po2);
      for (int j = 0; j < N; j++)
        a[j] = ((p << 4) * j) / (N - 1) - (p << 5);

This patch adds an asm to stop the loop being vectorised.

gcc/testsuite/
	* gcc.dg/vect/vect-sdiv-pow2-1.c (main): Add an asm to the
	set-up loop.
---

diff --git a/gcc/testsuite/gcc.dg/vect/vect-sdiv-pow2-1.c b/gcc/testsuite/gcc.dg/vect/vect-sdiv-pow2-1.c
index be70bc6c47e..484efb1e8c8 100644
--- a/gcc/testsuite/gcc.dg/vect/vect-sdiv-pow2-1.c
+++ b/gcc/testsuite/gcc.dg/vect/vect-sdiv-pow2-1.c
@@ -62,7 +62,10 @@ main (void)
     {
       int p = power2 (fns[i].po2);
       for (int j = 0; j < N; j++)
-        a[j] = ((p << 4) * j) / (N - 1) - (p << 5);
+	{
+	  a[j] = ((p << 4) * j) / (N - 1) - (p << 5);
+	  asm volatile ("" ::: "memory");
+	}
 
       fns[i].div (b, a, N);
       fns[i].mod (c, a, N);