[PATCH 1/5] testsuite: Fix vect/vect-sdiv-pow2-1.c

[Richard Sandiford via Gcc-patches]

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);

Rather than adjust the expected output for that, it seemed better
to disable optimisation for the testing code.

Tested on aarch64-linux-gnu (with and without SVE), arm-linux-gnueabihf
and x86_64-linux-gnu.  OK to install?

Richard


gcc/testsuite/
        * gcc.dg/vect/vect-sdiv-pow2-1.c (main): Disable optimization.
---
 gcc/testsuite/gcc.dg/vect/vect-sdiv-pow2-1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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..bf387133d01 100644
--- a/gcc/testsuite/gcc.dg/vect/vect-sdiv-pow2-1.c
+++ b/gcc/testsuite/gcc.dg/vect/vect-sdiv-pow2-1.c
@@ -53,7 +53,7 @@ power2 (int x)
 
 #define N 50
 
-int
+int __attribute__ ((optimize (0)))
 main (void)
 {
   int a[N], b[N], c[N];